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Full vulnerability report · 2026
CVE-2026-52942High confidence

netfilter: nf_log: validate MAC header was set before dumping it

Linux · Linux

7.1HighCVSS 3.1
Recommended action
Patch only the product branches with a verified fix

High technical severity; prioritise exposed affected systems while verifying vendor guidance. Verified remediation exists for at least one product or source, but 25 structured product or package states remain unresolved. Apply remediation only to the exact product branch confirmed by its source.

Fix availability varies by product
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityHighOperational priority:Medium, lowered one band.downgradedsince 8 Sep 2026

Evidence used

  • No CISA KEV confirmation is currently recorded.
  • Exploitation requires an existing local or physical foothold with privileges.
  • EPSS is 0.13% for the current model date.

Compensating controls

  • Validate the affected product branch and deploy the verified fixed release.
  • Restrict local access and enforce least privilege on affected hosts.
  • Monitor vendor guidance and exploitation sources for a material change.

Verification

  1. Confirm that the asset runs Linux Linux and falls inside the recorded affected range.
  2. Verify the installed build against the product-specific fixed version after deployment.
  3. Validate exposure, authentication requirements and compensating controls in the actual environment.
  4. Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Mitigation target: As exposure requiresRemediation target: Within 365 days

This automated reassessment organises public evidence. It does not know asset exposure, business impact or control effectiveness and does not replace CVSS or a human risk decision.

Cross-source reconciliation

Remediation availability differs by product scope

Verified remediation exists for at least one product or source, but 25 structured product or package states remain unresolved. Apply remediation only to the exact product branch confirmed by its source.

Distribution package intelligence

Release-specific package status

Debian, ubuntu findings are scoped to the named distribution, release and source package. An absent finding does not mean a package is unaffected.

24 package states
Package result overrides the generic status

BlackTree has verified remediation for at least one product or source, but the relevant distribution still reports no fixed package for 20 affected package states shown here. Treat those rows as affected with no fix until that distribution publishes a fixed version.

Repository candidate not checked

A published vendor fix does not prove that a matching update is enabled and installable on a particular asset. Confirm the local package candidate before scheduling remediation.

Distribution releaseSource packageVendor stateFixed versionEvidence
Debian trixietrixie · sourcelinuxVendor fix publishedDebian records a fixed source-package version for this release.6.12.94-1Debian Security Tracker ↗Source updated 6 Oct 2026
Debian bookwormbookworm · sourcelinuxVendor fix publishedDebian records a fixed source-package version for this release.6.1.176-1Debian Security Tracker ↗Source updated 6 Oct 2026
Debian forkyforky · sourcelinuxVendor fix publishedDebian records a fixed source-package version for this release.7.0.13-1Debian Security Tracker ↗Source updated 6 Oct 2026
Debian sidsid · sourcelinuxVendor fix publishedDebian records a fixed source-package version for this release.7.0.13-1Debian Security Tracker ↗Source updated 6 Oct 2026
Ubuntu 24.04 LTSnoble · standard archivelinuxAffected, no fix publishedCanonical OVAL identifies this running kernel flavour as affected and does not publish a fixed package version in this definition.Not published in this feedCanonical Ubuntu Security ↗Source updated 5 Oct 2026
Ubuntu 24.04 LTSnoble · standard archivelinux-awsAffected, no fix publishedCanonical OVAL identifies this running kernel flavour as affected and does not publish a fixed package version in this definition.Not published in this feedCanonical Ubuntu Security ↗Source updated 5 Oct 2026
Ubuntu 24.04 LTSnoble · standard archivelinux-azureAffected, no fix publishedCanonical OVAL identifies this running kernel flavour as affected and does not publish a fixed package version in this definition.Not published in this feedCanonical Ubuntu Security ↗Source updated 5 Oct 2026
Ubuntu 24.04 LTSnoble · standard archivelinux-azure-fdeAffected, no fix publishedCanonical OVAL identifies this running kernel flavour as affected and does not publish a fixed package version in this definition.Not published in this feedCanonical Ubuntu Security ↗Source updated 5 Oct 2026
Ubuntu 24.04 LTSnoble · standard archivelinux-azure-nvidiaAffected, no fix publishedCanonical OVAL identifies this running kernel flavour as affected and does not publish a fixed package version in this definition.Not published in this feedCanonical Ubuntu Security ↗Source updated 5 Oct 2026
Ubuntu 24.04 LTSnoble · standard archivelinux-gcpAffected, no fix publishedCanonical OVAL identifies this running kernel flavour as affected and does not publish a fixed package version in this definition.Not published in this feedCanonical Ubuntu Security ↗Source updated 5 Oct 2026
Ubuntu 24.04 LTSnoble · standard archivelinux-gkeAffected, no fix publishedCanonical OVAL identifies this running kernel flavour as affected and does not publish a fixed package version in this definition.Not published in this feedCanonical Ubuntu Security ↗Source updated 5 Oct 2026
Ubuntu 24.04 LTSnoble · standard archivelinux-gkeopAffected, no fix publishedCanonical OVAL identifies this running kernel flavour as affected and does not publish a fixed package version in this definition.Not published in this feedCanonical Ubuntu Security ↗Source updated 5 Oct 2026
Ubuntu 24.04 LTSnoble · standard archivelinux-ibmAffected, no fix publishedCanonical OVAL identifies this running kernel flavour as affected and does not publish a fixed package version in this definition.Not published in this feedCanonical Ubuntu Security ↗Source updated 5 Oct 2026
Ubuntu 24.04 LTSnoble · standard archivelinux-lowlatencyAffected, no fix publishedCanonical OVAL identifies this running kernel flavour as affected and does not publish a fixed package version in this definition.Not published in this feedCanonical Ubuntu Security ↗Source updated 5 Oct 2026
Ubuntu 24.04 LTSnoble · standard archivelinux-nvidiaAffected, no fix publishedCanonical OVAL identifies this running kernel flavour as affected and does not publish a fixed package version in this definition.Not published in this feedCanonical Ubuntu Security ↗Source updated 5 Oct 2026
Ubuntu 24.04 LTSnoble · standard archivelinux-nvidia-lowlatencyAffected, no fix publishedCanonical OVAL identifies this running kernel flavour as affected and does not publish a fixed package version in this definition.Not published in this feedCanonical Ubuntu Security ↗Source updated 5 Oct 2026
Ubuntu 24.04 LTSnoble · standard archivelinux-nvidia-tegraAffected, no fix publishedCanonical OVAL identifies this running kernel flavour as affected and does not publish a fixed package version in this definition.Not published in this feedCanonical Ubuntu Security ↗Source updated 5 Oct 2026
Ubuntu 24.04 LTSnoble · standard archivelinux-oem-6.11Affected, no fix publishedCanonical OVAL identifies this running kernel flavour as affected and does not publish a fixed package version in this definition.Not published in this feedCanonical Ubuntu Security ↗Source updated 5 Oct 2026
Ubuntu 24.04 LTSnoble · standard archivelinux-oracleAffected, no fix publishedCanonical OVAL identifies this running kernel flavour as affected and does not publish a fixed package version in this definition.Not published in this feedCanonical Ubuntu Security ↗Source updated 5 Oct 2026
Ubuntu 24.04 LTSnoble · standard archivelinux-raspiAffected, no fix publishedCanonical OVAL identifies this running kernel flavour as affected and does not publish a fixed package version in this definition.Not published in this feedCanonical Ubuntu Security ↗Source updated 5 Oct 2026
Ubuntu 24.04 LTSnoble · standard archivelinux-raspi-realtimeAffected, no fix publishedCanonical OVAL identifies this running kernel flavour as affected and does not publish a fixed package version in this definition.Not published in this feedCanonical Ubuntu Security ↗Source updated 5 Oct 2026
Ubuntu 24.04 LTSnoble · standard archivelinux-realtimeAffected, no fix publishedCanonical OVAL identifies this running kernel flavour as affected and does not publish a fixed package version in this definition.Not published in this feedCanonical Ubuntu Security ↗Source updated 5 Oct 2026
Ubuntu 24.04 LTSnoble · standard archivelinux-riscvAffected, no fix publishedCanonical OVAL identifies this running kernel flavour as affected and does not publish a fixed package version in this definition.Not published in this feedCanonical Ubuntu Security ↗Source updated 5 Oct 2026
Ubuntu 24.04 LTSnoble · standard archivelinux-xilinxAffected, no fix publishedCanonical OVAL identifies this running kernel flavour as affected and does not publish a fixed package version in this definition.Not published in this feedCanonical Ubuntu Security ↗Source updated 5 Oct 2026
Direct vendor intelligence

Authoritative vendor CSAF and VEX advisories

Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.

3 current
CVE-2026-52942 · CSAF 2.0 · revision 15 · interimSUSE Product Security TeamCVE-2026-52942
301 known affected

The vendor explicitly identifies these products as affected by this CVE.

  • kernel-default as component of SUSE Linux Enterprise Desktop 15 SP7
  • kernel-default-extra as component of SUSE Linux Enterprise Desktop 15 SP7
  • kernel-source as component of SUSE Linux Enterprise Desktop 15 SP7
  • cluster-md-kmp-default as component of SUSE Linux Enterprise High Availability Extension 15 SP7
  • dlm-kmp-default as component of SUSE Linux Enterprise High Availability Extension 15 SP7
  • gfs2-kmp-default as component of SUSE Linux Enterprise High Availability Extension 15 SP7
  • kernel-default as component of SUSE Linux Enterprise High Availability Extension 15 SP7
  • kernel-source as component of SUSE Linux Enterprise High Availability Extension 15 SP7
  • ocfs2-kmp-default as component of SUSE Linux Enterprise High Availability Extension 15 SP7
  • kernel-default as component of SUSE Linux Enterprise High Performance Computing 12 SP4
  • kernel-default-base as component of SUSE Linux Enterprise High Performance Computing 12 SP4
  • kernel-default-devel as component of SUSE Linux Enterprise High Performance Computing 12 SP4
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_log: validate MAC header was set before dumping it The fallback path of dump_mac_header() guards the MAC header access only with "skb->mac_header != skb->network_header", without checking skb_mac_header_was_set(). When the MAC header is unset, mac_header is 0xffff, so the test passes and skb_mac_header(skb) returns skb->head + 0xffff, ~64 KiB past the buffer; the loop then reads dev->hard_header_len bytes out of bounds into the kernel log. This is reachable via the netdev logger: nf_log_unknown_packet() calls dump_mac_header() unconditionally, and an skb sent through AF_PACKET with PACKET_QDISC_BYPASS reaches the egress hook with mac_header still unset (__dev_queue_xmit(), which would reset it, is bypassed). Add the skb_mac_header_was_set() check the ARPHRD_ETHER path already uses, and replace the open-coded MAC header length test with skb_mac_header_len(). Only skbs with an unset MAC header are affected; valid ones are dumped as before. BUG: KASAN: slab-out-of-bounds in dump_mac_header (net/netfilter/nf_log_syslog.c:831) Read of size 1 at addr ffff88800ea49d3f by task exploit/148 Call Trace: kasan_report (mm/kasan/report.c:595) dump_mac_header (net/netfilter/nf_log_syslog.c:831) nf_log_netdev_packet (net/netfilter/nf_log_syslog.c:938 net/netfilter/nf_log_syslog.c:963) nf_log_packet (net/netfilter/nf_log.c:260) nft_log_eval (net/netfilter/nft_log.c:60) nft_do_chain (net/netfilter/nf_tables_core.c:285) nft_do_chain_netdev (net/netfilter/nft_chain_filter.c:307) nf_hook_slow (net/netfilter/core.c:619) nf_hook_direct_egress (net/packet/af_packet.c:257) packet_xmit (net/packet/af_packet.c:280) packet_sendmsg (net/packet/af_packet.c:3114) __sys_sendto (net/socket.c:2265)
Remediation
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
CVE-2026-52942 · CSAF 2.0 · revision 3 · finalRed Hat Product Securitykernel: netfilter: nf_log: validate MAC header was set before dumping it
184 known affected

The vendor explicitly identifies these products as affected by this CVE.

  • kernel as a component of Red Hat Enterprise Linux 10
  • kernel-64k as a component of Red Hat Enterprise Linux 10
  • kernel-64k-core as a component of Red Hat Enterprise Linux 10
  • kernel-64k-debug as a component of Red Hat Enterprise Linux 10
  • kernel-64k-debug-core as a component of Red Hat Enterprise Linux 10
  • kernel-64k-debug-devel as a component of Red Hat Enterprise Linux 10
  • kernel-64k-debug-devel-matched as a component of Red Hat Enterprise Linux 10
  • kernel-64k-debug-modules as a component of Red Hat Enterprise Linux 10
  • kernel-64k-debug-modules-core as a component of Red Hat Enterprise Linux 10
  • kernel-64k-debug-modules-extra as a component of Red Hat Enterprise Linux 10
  • kernel-64k-devel as a component of Red Hat Enterprise Linux 10
  • kernel-64k-devel-matched as a component of Red Hat Enterprise Linux 10
Summary
A flaw was found in the Linux kernel's netfilter logging component. This vulnerability occurs because the system does not properly check if a network packet's Media Access Control (MAC) header is valid before attempting to log it. A local attacker could send a specially crafted network packet, leading to an out-of-bounds read. This could result in the disclosure of sensitive information from kernel memory or cause a system crash, leading to a denial of service.
Remediation
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect. Red Hat recommends treating all kernel errata as security-relevant. Given the kernel's fundamental role, any bug has a higher chance of impacting system security, even if that impact only becomes clear after a fix is published. Therefore, Red Hat prioritizes delivering fixes that improve our customers' overall security posture. Because of this proactive approach, a patch may be associated with a CVE assignment at a future date. Retroactive CVE assignments are always documented in the corresponding errata and on Red Hat's CVE pages. We strongly advise against delaying updates, as doing so may leave your system exposed when protections are already available.
SSA-019113 · CSAF 2.0 · revision 2 · interimSiemens ProductCERTSSA-019113: Vulnerabilities in the additional GNU/Linux subsystem of the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP V3.1.6
5 known affected

The vendor explicitly identifies these products as affected by this CVE.

  • SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) >= V3.1.6
  • SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) >= V3.1.6
  • SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) >= V3.1.6
  • SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0) >= V3.1.6
  • SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0) >= V3.1.6
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_log: validate MAC header was set before dumping it The fallback path of dump_mac_header() guards the MAC header access only with "skb->mac_header != skb->network_header", without checking skb_mac_header_was_set(). When the MAC header is unset, mac_header is 0xffff, so the test passes and skb_mac_header(skb) returns skb->head + 0xffff, ~64 KiB past the buffer; the loop then reads dev->hard_header_len bytes out of bounds into the kernel log. This is reachable via the netdev logger: nf_log_unknown_packet() calls dump_mac_header() unconditionally, and an skb sent through AF_PACKET with PACKET_QDISC_BYPASS reaches the egress hook with mac_header still unset (__dev_queue_xmit(), which would reset it, is bypassed). Add the skb_mac_header_was_set() check the ARPHRD_ETHER path already uses, and replace the open-coded MAC header length test with skb_mac_header_len(). Only skbs with an unset MAC header are affected; valid ones are dumped as before. BUG: KASAN: slab-out-of-bounds in dump_mac_header (net/netfilter/nf_log_syslog.c:831) Read of size 1 at addr ffff88800ea49d3f by task exploit/148 Call Trace: kasan_report (mm/kasan/report.c:595) dump_mac_header (net/netfilter/nf_log_syslog.c:831) nf_log_netdev_packet (net/netfilter/nf_log_syslog.c:938 net/netfilter/nf_log_syslog.c:963) nf_log_packet (net/netfilter/nf_log.c:260) nft_log_eval (net/netfilter/nft_log.c:60) nft_do_chain (net/netfilter/nf_tables_core.c:285) nft_do_chain_netdev (net/netfilter/nft_chain_filter.c:307) nf_hook_slow (net/netfilter/core.c:619) nf_hook_direct_egress (net/packet/af_packet.c:257) packet_xmit (net/packet/af_packet.c:280) packet_sendmsg (net/packet/af_packet.c:3114) __sys_sendto (net/socket.c:2265)
Remediation
Limit access to the interactive shell of the additional GNU/Linux subssytem to trusted personnel only.
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Choose official national sources for this report. Each advisory shows its original language. Your selection is remembered on this device and included in shared links.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2026-38712

No EUVD known-exploited evidence

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_log: validate MAC header was set before dumping it The fallback path of dump_mac_header() guards the MAC header access only with "skb->mac_header != skb->network_header", without checking skb_mac_header_was_set(). When the MAC header is unset, mac_header is 0xffff, so the test passes and skb_mac_header(skb) returns skb->head + 0xffff, ~64 KiB past the buffer; the loop then reads dev->hard_header_len bytes out of bounds into the kernel log. This is reachable via the netdev logger: nf_log_unknown_packet() calls dump_mac_header() unconditionally, and an skb sent through AF_PACKET with PACKET_QDISC_BYPASS reaches the egress hook with mac_header still unset (__dev_queue_xmit(), which would reset it, is bypassed). Add the skb_mac_header_was_set() check the ARPHRD_ETHER path already uses, and replace the open-coded MAC header length test with skb_mac_header_len(). Only skbs with an unset MAC header are affected; valid ones are dumped as before. BUG: KASAN: slab-out-of-bounds in dump_mac_header (net/netfilter/nf_log_syslog.c:831) Read of size 1 at addr ffff88800ea49d3f by task exploit/148 Call Trace: kasan_report (mm/kasan/report.c:595) dump_mac_header (net/netfilter/nf_log_syslog.c:831) nf_log_netdev_packet (net/netfilter/nf_log_syslog.c:938 net/netfilter/nf_log_syslog.c:963) nf_log_packet (net/netfilter/nf_log.c:260) nft_log_eval (net/netfilter/nft_log.c:60) nft_do_chain (net/netfilter/nf_tables_core.c:285) nft_do_chain_netdev (net/netfilter/nft_chain_filter.c:307) nf_hook_slow (net/netfilter/core.c:619) nf_hook_direct_egress (net/packet/af_packet.c:257) packet_xmit (net/packet/af_packet.c:280) packet_sendmsg (net/packet/af_packet.c:3114) __sys_sendto (net/socket.c:2265)

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
7.1 · CVSS 3.1
Advisory evidence
No linked advisory details stored yet
Recommended actionPatch only the product branches with a verified fix

High technical severity; prioritise exposed affected systems while verifying vendor guidance. Verified remediation exists for at least one product or source, but 25 structured product or package states remain unresolved. Apply remediation only to the exact product branch confirmed by its source.

Fix availability varies by product
01

What, why and how

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_log: validate MAC header was set before dumping it The fallback path of dump_mac_header() guards the MAC header access only with "skb->mac_header != skb->network_header", without checking skb_mac_header_was_set(). When the MAC header is unset, mac_header is 0xffff, so the test passes and skb_mac_header(skb) returns skb->head + 0xffff, ~64 KiB past the buffer; the loop then reads dev->hard_header_len bytes out of bounds into the kernel log. This is reachable via the netdev logger: nf_log_unknown_packet() calls dump_mac_header() unconditionally, and an skb sent through AF_PACKET with PACKET_QDISC_BYPASS reaches the egress hook with mac_header still unset (__dev_queue_xmit(), which would reset it, is bypassed). Add the skb_mac_header_was_set() check the ARPHRD_ETHER path already uses, and replace the open-coded MAC header length test with skb_mac_header_len(). Only skbs with an unset MAC header are affected; valid ones are dumped as before. BUG: KASAN: slab-out-of-bounds in dump_mac_header (net/netfilter/nf_log_syslog.c:831) Read of size 1 at addr ffff88800ea49d3f by task exploit/148 Call Trace: kasan_report (mm/kasan/report.c:595) dump_mac_header (net/netfilter/nf_log_syslog.c:831) nf_log_netdev_packet (net/netfilter/nf_log_syslog.c:938 net/netfilter/nf_log_syslog.c:963) nf_log_packet (net/netfilter/nf_log.c:260) nft_log_eval (net/netfilter/nft_log.c:60) nft_do_chain (net/netfilter/nf_tables_core.c:285) nft_do_chain_netdev (net/netfilter/nft_chain_filter.c:307) nf_hook_slow (net/netfilter/core.c:619) nf_hook_direct_egress (net/packet/af_packet.c:257) packet_xmit (net/packet/af_packet.c:280) packet_sendmsg (net/packet/af_packet.c:3114) __sys_sendto (net/socket.c:2265)

What

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_log: validate MAC header was set before dumping it The fallback path of dump_mac_header() guards the MAC header access only with "skb->mac_header != skb->network_header", without checking skb_mac_header_was_set(). When the MAC header is unset, mac_header is 0xffff, so the test passes and skb_mac_header(skb) returns skb->head + 0xffff, ~64 KiB past the buffer; the loop then reads dev->hard_header_len bytes out of bounds into the kernel log. This is reachable via the netdev logger: nf_log_unknown_packet() calls dump_mac_header() unconditionally, and an skb sent through AF_PACKET with PACKET_QDISC_BYPASS reaches the egress hook with mac_header still unset (__dev_queue_xmit(), which would reset it, is bypassed). Add the skb_mac_header_was_set() check the ARPHRD_ETHER path already uses, and replace the open-coded MAC header length test with skb_mac_header_len(). Only skbs with an unset MAC header are affected; valid ones are dumped as before. BUG: KASAN: slab-out-of-bounds in dump_mac_header (net/netfilter/nf_log_syslog.c:831) Read of size 1 at addr ffff88800ea49d3f by task exploit/148 Call Trace: kasan_report (mm/kasan/report.c:595) dump_mac_header (net/netfilter/nf_log_syslog.c:831) nf_log_netdev_packet (net/netfilter/nf_log_syslog.c:938 net/netfilter/nf_log_syslog.c:963) nf_log_packet (net/netfilter/nf_log.c:260) nft_log_eval (net/netfilter/nft_log.c:60) nft_do_chain (net/netfilter/nf_tables_core.c:285) nft_do_chain_netdev (net/netfilter/nft_chain_filter.c:307) nf_hook_slow (net/netfilter/core.c:619) nf_hook_direct_egress (net/packet/af_packet.c:257) packet_xmit (net/packet/af_packet.c:280) packet_sendmsg (net/packet/af_packet.c:3114) __sys_sendto (net/socket.c:2265)

Why

The product reads data past the end, or before the beginning, of the intended buffer.

How

An attacker operating through local access may attempt exploitation with low privileges. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

What

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_log: validate MAC header was set before dumping it The fallback path of dump_mac_header() guards the MAC header access only with "skb->mac_header != skb->network_header", without checking skb_mac_header_was_set(). When the MAC header is unset, mac_header is 0xffff, so the test passes and skb_mac_header(skb) returns skb->head + 0xffff, ~64 KiB past the buffer; the loop then reads dev->hard_header_len bytes out of bounds into the kernel log. This is reachable via the netdev logger: nf_log_unknown_packet() calls dump_mac_header() unconditionally, and an skb sent through AF_PACKET with PACKET_QDISC_BYPASS reaches the egress hook with mac_header still unset (__dev_queue_xmit(), which would reset it, is bypassed). Add the skb_mac_header_was_set() check the ARPHRD_ETHER path already uses, and replace the open-coded MAC header length test with skb_mac_header_len(). Only skbs with an unset MAC header are affected; valid ones are dumped as before. BUG: KASAN: slab-out-of-bounds in dump_mac_header (net/netfilter/nf_log_syslog.c:831) Read of size 1 at addr ffff88800ea49d3f by task exploit/148 Call Trace: kasan_report (mm/kasan/report.c:595) dump_mac_header (net/netfilter/nf_log_syslog.c:831) nf_log_netdev_packet (net/netfilter/nf_log_syslog.c:938 net/netfilter/nf_log_syslog.c:963) nf_log_packet (net/netfilter/nf_log.c:260) nft_log_eval (net/netfilter/nft_log.c:60) nft_do_chain (net/netfilter/nf_tables_core.c:285) nft_do_chain_netdev (net/netfilter/nft_chain_filter.c:307) nf_hook_slow (net/netfilter/core.c:619) nf_hook_direct_egress (net/packet/af_packet.c:257) packet_xmit (net/packet/af_packet.c:280) packet_sendmsg (net/packet/af_packet.c:3114) __sys_sendto (net/socket.c:2265)

Why

The product reads data past the end, or before the beginning, of the intended buffer.

How

An attacker operating through local access may attempt exploitation with low privileges. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
None recorded

No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.

Likely attack path
local access → Out-of-bounds Read → cause the confidentiality, integrity or availability impact described by the vendor
Attack surface
Local
Privileges required
Low: a basic authenticated account is required
User interaction
None
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Unchanged: impact remains within the vulnerable component's security authority
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-125 ↗

CWE-125: Out-of-bounds Read. The product reads data past the end, or before the beginning, of the intended buffer.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.

AVLocalAttack vector: The attacker needs local access to the vulnerable system.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRLowPrivileges required: The attacker needs basic user-level privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CHighConfidentiality impact: A successful attack can cause a major loss.INoneIntegrity impact: No direct loss is represented by this metric.AHighAvailability impact: A successful attack can cause a major loss.
Post-exploitation / living off the land
The issue can support a local privilege or sandbox boundary transition; normal system utilities may then be available in the gained context.
CWE-125
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

ENISA EUVD · EUVD-2026-38712Official EUVD mapping

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_log: validate MAC header was set before dumping it The fallback path of dump_mac_header() guards the MAC header access only with "skb->mac_header != skb->network_header", without checking skb_mac_header_was_set(). When the MAC header is unset, mac_header is 0xffff, so the test passes and skb_mac_header(skb) returns skb->head + 0xffff, ~64 KiB past the buffer; the loop then reads dev->hard_header_len bytes out of bounds into the kernel log. This is reachable via the netdev logger: nf_log_unknown_packet() calls dump_mac_header() unconditionally, and an skb sent through AF_PACKET with PACKET_QDISC_BYPASS reaches the egress hook with mac_header still unset (__dev_queue_xmit(), which would reset it, is bypassed). Add the skb_mac_header_was_set() check the ARPHRD_ETHER path already uses, and replace the open-coded MAC header length test with skb_mac_header_len(). Only skbs with an unset MAC header are affected; valid ones are dumped as before. BUG: KASAN: slab-out-of-bounds in dump_mac_header (net/netfilter/nf_log_syslog.c:831) Read of size 1 at addr ffff88800ea49d3f by task exploit/148 Call Trace: kasan_report (mm/kasan/report.c:595) dump_mac_header (net/netfilter/nf_log_syslog.c:831) nf_log_netdev_packet (net/netfilter/nf_log_syslog.c:938 net/netfilter/nf_log_syslog.c:963) nf_log_packet (net/netfilter/nf_log.c:260) nft_log_eval (net/netfilter/nft_log.c:60) nft_do_chain (net/netfilter/nf_tables_core.c:285) nft_do_chain_netdev (net/netfilter/nft_chain_filter.c:307) nf_hook_slow (net/netfilter/core.c:619) nf_hook_direct_egress (net/packet/af_packet.c:257) packet_xmit (net/packet/af_packet.c:280) packet_sendmsg (net/packet/af_packet.c:3114) __sys_sendto (net/socket.c:2265)

Official EUVD record ↗
BSI · German · WID-SEC-2026-2056Linux Kernel: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen im Linux Kernel ausnutzen, um einen Denial-of-Service-Angriff auszulösen oder andere, nicht näher spezifizierte Angriffe durchzuführen.

Official advisory ↗
Cyber Security Agency of Singapore · English · CSA-SB-20260701Security Bulletin 1 July 2026

The Cyber Security Agency of Singapore included this CVE in its official Security Bulletin 1 July 2026, published on 1 July 2026. Open the linked bulletin for the product, severity and reference information published in that issue.

Official advisory ↗
CERT-FR · French · CERTFR-2026-AVI-1252Multiples vulnérabilités dans le noyau Linux d'Ubuntu

d?id=CVE-2026-52932 Référence CVE CVE-2026-52934 https://www.cve.org/CVERecord?id=CVE-2026-52934 Référence CVE CVE-2026-52935 https://www.cve.org/CVERecord?id=CVE-2026-52935 Référence CVE CVE-2026-52936 https://www.cve.org/CVERecord?id=CVE-2026-52936 Référence CVE CVE-2026-52937 https://www.cve.org/CVERecord?id=CVE-2026-52937 Référence CVE CVE-2026-52938 https://www.cve.org/CVERecord?id=CVE-2026-52938 Référence CVE CVE-2026-52939 https://www.cve.org/CVERecord?id=CVE-2026-52939 Référence CVE CVE-2026-52940 https://www.cve.org/CVERecord?id=CVE-2026-52940 Référence CVE CVE-2026-52941 https://www.cve.org/CVERecord?id=CVE-2026-52941 Référence CVE CVE-2026-52942 https://www.cve.org/CVERecord?id=CVE-2026-52942 Référence CVE CVE-2026-52943 https://www.cve.org/CVERecord?id=CVE-2026-52943 Référence CVE CVE-2026-52944 https://www.cve.org/CVERecord?id=CVE-2026-52944 Référence CVE CVE-2026-52947 https://www.cve.org/CVERecord?id=CVE-2026-52947 Référence CVE CVE-2026-52948 https://www.cve.org/CVERecord?id=CVE-2026-52948 Référence CVE CVE-2026-52949 https://www.cve.org/CVERecord?id=CVE-2026-52949 Référence CVE CVE-2026-52950 https://www.cve.org/CVERecord?id=CVE-2026-52950 Référence CVE CVE-2026-52951 https://www.cve.org/CVERecord?id=CVE-2026-52951 Référence CVE CVE-2026-52952 https://www.cve.org/CVERecord?id=

Official advisory ↗
CERT-FR · French · CERTFR-2026-AVI-1229Multiples vulnérabilités dans le noyau Linux d'Ubuntu

d?id=CVE-2026-52932 Référence CVE CVE-2026-52934 https://www.cve.org/CVERecord?id=CVE-2026-52934 Référence CVE CVE-2026-52935 https://www.cve.org/CVERecord?id=CVE-2026-52935 Référence CVE CVE-2026-52936 https://www.cve.org/CVERecord?id=CVE-2026-52936 Référence CVE CVE-2026-52937 https://www.cve.org/CVERecord?id=CVE-2026-52937 Référence CVE CVE-2026-52938 https://www.cve.org/CVERecord?id=CVE-2026-52938 Référence CVE CVE-2026-52939 https://www.cve.org/CVERecord?id=CVE-2026-52939 Référence CVE CVE-2026-52940 https://www.cve.org/CVERecord?id=CVE-2026-52940 Référence CVE CVE-2026-52941 https://www.cve.org/CVERecord?id=CVE-2026-52941 Référence CVE CVE-2026-52942 https://www.cve.org/CVERecord?id=CVE-2026-52942 Référence CVE CVE-2026-52943 https://www.cve.org/CVERecord?id=CVE-2026-52943 Référence CVE CVE-2026-52944 https://www.cve.org/CVERecord?id=CVE-2026-52944 Référence CVE CVE-2026-52947 https://www.cve.org/CVERecord?id=CVE-2026-52947 Référence CVE CVE-2026-52948 https://www.cve.org/CVERecord?id=CVE-2026-52948 Référence CVE CVE-2026-52949 https://www.cve.org/CVERecord?id=CVE-2026-52949 Référence CVE CVE-2026-52950 https://www.cve.org/CVERecord?id=CVE-2026-52950 Référence CVE CVE-2026-52951 https://www.cve.org/CVERecord?id=CVE-2026-52951 Référence CVE CVE-2026-52952 https://www.cve.org/CVERecord?id=

Official advisory ↗
CERT-FR · French · CERTFR-2026-AVI-1203Multiples vulnérabilités dans le noyau Linux d'Ubuntu

d?id=CVE-2026-52929 Référence CVE CVE-2026-52930 https://www.cve.org/CVERecord?id=CVE-2026-52930 Référence CVE CVE-2026-52931 https://www.cve.org/CVERecord?id=CVE-2026-52931 Référence CVE CVE-2026-52934 https://www.cve.org/CVERecord?id=CVE-2026-52934 Référence CVE CVE-2026-52935 https://www.cve.org/CVERecord?id=CVE-2026-52935 Référence CVE CVE-2026-52938 https://www.cve.org/CVERecord?id=CVE-2026-52938 Référence CVE CVE-2026-52939 https://www.cve.org/CVERecord?id=CVE-2026-52939 Référence CVE CVE-2026-52940 https://www.cve.org/CVERecord?id=CVE-2026-52940 Référence CVE CVE-2026-52941 https://www.cve.org/CVERecord?id=CVE-2026-52941 Référence CVE CVE-2026-52942 https://www.cve.org/CVERecord?id=CVE-2026-52942 Référence CVE CVE-2026-52947 https://www.cve.org/CVERecord?id=CVE-2026-52947 Référence CVE CVE-2026-52948 https://www.cve.org/CVERecord?id=CVE-2026-52948 Référence CVE CVE-2026-52955 https://www.cve.org/CVERecord?id=CVE-2026-52955 Référence CVE CVE-2026-52956 https://www.cve.org/CVERecord?id=CVE-2026-52956 Référence CVE CVE-2026-52958 https://www.cve.org/CVERecord?id=CVE-2026-52958 Référence CVE CVE-2026-52982 https://www.cve.org/CVERecord?id=CVE-2026-52982 Référence CVE CVE-2026-52986 https://www.cve.org/CVERecord?id=CVE-2026-52986 Référence CVE CVE-2026-52988 https://www.cve.org/CVERecord?id=

Official advisory ↗
CERT-FR · French · CERTFR-2026-AVI-1161Multiples vulnérabilités dans le noyau Linux de Red Hat

d?id=CVE-2026-45998 Référence CVE CVE-2026-46056 https://www.cve.org/CVERecord?id=CVE-2026-46056 Référence CVE CVE-2026-46099 https://www.cve.org/CVERecord?id=CVE-2026-46099 Référence CVE CVE-2026-46117 https://www.cve.org/CVERecord?id=CVE-2026-46117 Référence CVE CVE-2026-46120 https://www.cve.org/CVERecord?id=CVE-2026-46120 Référence CVE CVE-2026-46145 https://www.cve.org/CVERecord?id=CVE-2026-46145 Référence CVE CVE-2026-46149 https://www.cve.org/CVERecord?id=CVE-2026-46149 Référence CVE CVE-2026-46155 https://www.cve.org/CVERecord?id=CVE-2026-46155 Référence CVE CVE-2026-52917 https://www.cve.org/CVERecord?id=CVE-2026-52917 Référence CVE CVE-2026-52942 https://www.cve.org/CVERecord?id=CVE-2026-52942 Référence CVE CVE-2026-52986 https://www.cve.org/CVERecord?id=CVE-2026-52986 Référence CVE CVE-2026-53002 https://www.cve.org/CVERecord?id=CVE-2026-53002 Référence CVE CVE-2026-53006 https://www.cve.org/CVERecord?id=CVE-2026-53006 Référence CVE CVE-2026-53009 https://www.cve.org/CVERecord?id=CVE-2026-53009 Référence CVE CVE-2026-53016 https://www.cve.org/CVERecord?id=CVE-2026-53016 Référence CVE CVE-2026-53071 https://www.cve.org/CVERecord?id=CVE-2026-53071 Référence CVE CVE-2026-53091 https://www.cve.org/CVERecord?id=CVE-2026-53091 Référence CVE CVE-2026-53196 https://www.cve.org/CVERecord?id=

Official advisory ↗
CERT-FR · French · CERTFR-2026-AVI-1162Multiples vulnérabilités dans le noyau Linux d'Ubuntu

d?id=CVE-2026-52932 Référence CVE CVE-2026-52934 https://www.cve.org/CVERecord?id=CVE-2026-52934 Référence CVE CVE-2026-52935 https://www.cve.org/CVERecord?id=CVE-2026-52935 Référence CVE CVE-2026-52936 https://www.cve.org/CVERecord?id=CVE-2026-52936 Référence CVE CVE-2026-52937 https://www.cve.org/CVERecord?id=CVE-2026-52937 Référence CVE CVE-2026-52938 https://www.cve.org/CVERecord?id=CVE-2026-52938 Référence CVE CVE-2026-52939 https://www.cve.org/CVERecord?id=CVE-2026-52939 Référence CVE CVE-2026-52940 https://www.cve.org/CVERecord?id=CVE-2026-52940 Référence CVE CVE-2026-52941 https://www.cve.org/CVERecord?id=CVE-2026-52941 Référence CVE CVE-2026-52942 https://www.cve.org/CVERecord?id=CVE-2026-52942 Référence CVE CVE-2026-52943 https://www.cve.org/CVERecord?id=CVE-2026-52943 Référence CVE CVE-2026-52944 https://www.cve.org/CVERecord?id=CVE-2026-52944 Référence CVE CVE-2026-52947 https://www.cve.org/CVERecord?id=CVE-2026-52947 Référence CVE CVE-2026-52948 https://www.cve.org/CVERecord?id=CVE-2026-52948 Référence CVE CVE-2026-52949 https://www.cve.org/CVERecord?id=CVE-2026-52949 Référence CVE CVE-2026-52950 https://www.cve.org/CVERecord?id=CVE-2026-52950 Référence CVE CVE-2026-52951 https://www.cve.org/CVERecord?id=CVE-2026-52951 Référence CVE CVE-2026-52952 https://www.cve.org/CVERecord?id=

Official advisory ↗
CERT-FR · French · CERTFR-2026-AVI-1091Multiples vulnérabilités dans le noyau Linux de SUSE

d?id=CVE-2026-46331 Référence CVE CVE-2026-46333 https://www.cve.org/CVERecord?id=CVE-2026-46333 Référence CVE CVE-2026-52910 https://www.cve.org/CVERecord?id=CVE-2026-52910 Référence CVE CVE-2026-52921 https://www.cve.org/CVERecord?id=CVE-2026-52921 Référence CVE CVE-2026-52923 https://www.cve.org/CVERecord?id=CVE-2026-52923 Référence CVE CVE-2026-52927 https://www.cve.org/CVERecord?id=CVE-2026-52927 Référence CVE CVE-2026-52930 https://www.cve.org/CVERecord?id=CVE-2026-52930 Référence CVE CVE-2026-52937 https://www.cve.org/CVERecord?id=CVE-2026-52937 Référence CVE CVE-2026-52941 https://www.cve.org/CVERecord?id=CVE-2026-52941 Référence CVE CVE-2026-52942 https://www.cve.org/CVERecord?id=CVE-2026-52942 Référence CVE CVE-2026-52947 https://www.cve.org/CVERecord?id=CVE-2026-52947 Référence CVE CVE-2026-52956 https://www.cve.org/CVERecord?id=CVE-2026-52956 Référence CVE CVE-2026-52967 https://www.cve.org/CVERecord?id=CVE-2026-52967 Référence CVE CVE-2026-52970 https://www.cve.org/CVERecord?id=CVE-2026-52970 Référence CVE CVE-2026-52972 https://www.cve.org/CVERecord?id=CVE-2026-52972 Référence CVE CVE-2026-52974 https://www.cve.org/CVERecord?id=CVE-2026-52974 Référence CVE CVE-2026-52984 https://www.cve.org/CVERecord?id=CVE-2026-52984 Référence CVE CVE-2026-52986 https://www.cve.org/CVERecord?id=

Official advisory ↗
CERT-FR · French · CERTFR-2026-AVI-1064Multiples vulnérabilités dans le noyau Linux de SUSE

d?id=CVE-2026-52922 Référence CVE CVE-2026-52925 https://www.cve.org/CVERecord?id=CVE-2026-52925 Référence CVE CVE-2026-52926 https://www.cve.org/CVERecord?id=CVE-2026-52926 Référence CVE CVE-2026-52927 https://www.cve.org/CVERecord?id=CVE-2026-52927 Référence CVE CVE-2026-52930 https://www.cve.org/CVERecord?id=CVE-2026-52930 Référence CVE CVE-2026-52934 https://www.cve.org/CVERecord?id=CVE-2026-52934 Référence CVE CVE-2026-52936 https://www.cve.org/CVERecord?id=CVE-2026-52936 Référence CVE CVE-2026-52937 https://www.cve.org/CVERecord?id=CVE-2026-52937 Référence CVE CVE-2026-52941 https://www.cve.org/CVERecord?id=CVE-2026-52941 Référence CVE CVE-2026-52942 https://www.cve.org/CVERecord?id=CVE-2026-52942 Référence CVE CVE-2026-52947 https://www.cve.org/CVERecord?id=CVE-2026-52947 Référence CVE CVE-2026-52948 https://www.cve.org/CVERecord?id=CVE-2026-52948 Référence CVE CVE-2026-52951 https://www.cve.org/CVERecord?id=CVE-2026-52951 Référence CVE CVE-2026-52953 https://www.cve.org/CVERecord?id=CVE-2026-52953 Référence CVE CVE-2026-52956 https://www.cve.org/CVERecord?id=CVE-2026-52956 Référence CVE CVE-2026-52958 https://www.cve.org/CVERecord?id=CVE-2026-52958 Référence CVE CVE-2026-52959 https://www.cve.org/CVERecord?id=CVE-2026-52959 Référence CVE CVE-2026-52963 https://www.cve.org/CVERecord?id=

Official advisory ↗
CERT-FR · French · CERTFR-2026-AVI-1029Multiples vulnérabilités dans le noyau Linux de SUSE

d?id=CVE-2026-46322 Référence CVE CVE-2026-46323 https://www.cve.org/CVERecord?id=CVE-2026-46323 Référence CVE CVE-2026-46324 https://www.cve.org/CVERecord?id=CVE-2026-46324 Référence CVE CVE-2026-46333 https://www.cve.org/CVERecord?id=CVE-2026-46333 Référence CVE CVE-2026-52910 https://www.cve.org/CVERecord?id=CVE-2026-52910 Référence CVE CVE-2026-52915 https://www.cve.org/CVERecord?id=CVE-2026-52915 Référence CVE CVE-2026-52927 https://www.cve.org/CVERecord?id=CVE-2026-52927 Référence CVE CVE-2026-52930 https://www.cve.org/CVERecord?id=CVE-2026-52930 Référence CVE CVE-2026-52933 https://www.cve.org/CVERecord?id=CVE-2026-52933 Référence CVE CVE-2026-52942 https://www.cve.org/CVERecord?id=CVE-2026-52942 Référence CVE CVE-2026-52948 https://www.cve.org/CVERecord?id=CVE-2026-52948 Référence CVE CVE-2026-52956 https://www.cve.org/CVERecord?id=CVE-2026-52956 Référence CVE CVE-2026-52958 https://www.cve.org/CVERecord?id=CVE-2026-52958 Référence CVE CVE-2026-52967 https://www.cve.org/CVERecord?id=CVE-2026-52967 Référence CVE CVE-2026-52981 https://www.cve.org/CVERecord?id=CVE-2026-52981 Référence CVE CVE-2026-52982 https://www.cve.org/CVERecord?id=CVE-2026-52982 Référence CVE CVE-2026-52984 https://www.cve.org/CVERecord?id=CVE-2026-52984 Référence CVE CVE-2026-52986 https://www.cve.org/CVERecord?id=

Official advisory ↗
CERT-FR · French · CERTFR-2026-AVI-0982Multiples vulnérabilités dans le noyau Linux de Debian LTS

d?id=CVE-2026-31610 Référence CVE CVE-2026-31755 https://www.cve.org/CVERecord?id=CVE-2026-31755 Référence CVE CVE-2026-43216 https://www.cve.org/CVERecord?id=CVE-2026-43216 Référence CVE CVE-2026-43219 https://www.cve.org/CVERecord?id=CVE-2026-43219 Référence CVE CVE-2026-43499 https://www.cve.org/CVERecord?id=CVE-2026-43499 Référence CVE CVE-2026-46116 https://www.cve.org/CVERecord?id=CVE-2026-46116 Référence CVE CVE-2026-46135 https://www.cve.org/CVERecord?id=CVE-2026-46135 Référence CVE CVE-2026-46252 https://www.cve.org/CVERecord?id=CVE-2026-46252 Référence CVE CVE-2026-46331 https://www.cve.org/CVERecord?id=CVE-2026-46331 Référence CVE CVE-2026-52942 https://www.cve.org/CVERecord?id=CVE-2026-52942 Référence CVE CVE-2026-53138 https://www.cve.org/CVERecord?id=CVE-2026-53138 Référence CVE CVE-2026-53157 https://www.cve.org/CVERecord?id=CVE-2026-53157 Référence CVE CVE-2026-53158 https://www.cve.org/CVERecord?id=CVE-2026-53158 Référence CVE CVE-2026-53159 https://www.cve.org/CVERecord?id=CVE-2026-53159 Référence CVE CVE-2026-53167 https://www.cve.org/CVERecord?id=CVE-2026-53167 Référence CVE CVE-2026-53177 https://www.cve.org/CVERecord?id=CVE-2026-53177 Référence CVE CVE-2026-53325 https://www.cve.org/CVERecord?id=CVE-2026-53325 Référence CVE CVE-2026-53329 https://www.cve.org/CVERecord?id=

Official advisory ↗
CERT-FR · French · CERTFR-2026-AVI-0862Multiples vulnérabilités dans le noyau Linux de Debian LTS

d?id=CVE-2026-52927 Référence CVE CVE-2026-52929 https://www.cve.org/CVERecord?id=CVE-2026-52929 Référence CVE CVE-2026-52930 https://www.cve.org/CVERecord?id=CVE-2026-52930 Référence CVE CVE-2026-52931 https://www.cve.org/CVERecord?id=CVE-2026-52931 Référence CVE CVE-2026-52933 https://www.cve.org/CVERecord?id=CVE-2026-52933 Référence CVE CVE-2026-52934 https://www.cve.org/CVERecord?id=CVE-2026-52934 Référence CVE CVE-2026-52935 https://www.cve.org/CVERecord?id=CVE-2026-52935 Référence CVE CVE-2026-52939 https://www.cve.org/CVERecord?id=CVE-2026-52939 Référence CVE CVE-2026-52941 https://www.cve.org/CVERecord?id=CVE-2026-52941 Référence CVE CVE-2026-52942 https://www.cve.org/CVERecord?id=CVE-2026-52942 Référence CVE CVE-2026-52943 https://www.cve.org/CVERecord?id=CVE-2026-52943 Référence CVE CVE-2026-52946 https://www.cve.org/CVERecord?id=CVE-2026-52946 Référence CVE CVE-2026-52947 https://www.cve.org/CVERecord?id=CVE-2026-52947 Référence CVE CVE-2026-52948 https://www.cve.org/CVERecord?id=CVE-2026-52948 Référence CVE CVE-2026-52954 https://www.cve.org/CVERecord?id=CVE-2026-52954 Référence CVE CVE-2026-52955 https://www.cve.org/CVERecord?id=CVE-2026-52955 Référence CVE CVE-2026-52957 https://www.cve.org/CVERecord?id=CVE-2026-52957 Référence CVE CVE-2026-52958 https://www.cve.org/CVERecord?id=

Official advisory ↗
CERT-FR · French · CERTFR-2026-AVI-0812Multiples vulnérabilités dans Microsoft Azure Linux

ulletin de sécurité Microsoft CVE-2026-52921 du 27 juin 2026 Bulletin de sécurité Microsoft CVE-2026-52922 du 27 juin 2026 Bulletin de sécurité Microsoft CVE-2026-52923 du 27 juin 2026 Bulletin de sécurité Microsoft CVE-2026-52924 du 27 juin 2026 Bulletin de sécurité Microsoft CVE-2026-52926 du 27 juin 2026 Bulletin de sécurité Microsoft CVE-2026-52927 du 27 juin 2026 Bulletin de sécurité Microsoft CVE-2026-52930 du 27 juin 2026 Bulletin de sécurité Microsoft CVE-2026-52931 du 27 juin 2026 Bulletin de sécurité Microsoft CVE-2026-52934 du 27 juin 2026 Bulletin de sécurité Microsoft CVE-2026-52941 du 27 juin 2026 Bulletin de sécurité Microsoft CVE-2026-52942 du 27 juin 2026 Bulletin de sécurité Microsoft CVE-2026-52943 du 27 juin 2026 Bulletin de sécurité Microsoft CVE-2026-52947 du 27 juin 2026 Bulletin de sécurité Microsoft CVE-2026-53080 du 27 juin 2026 Bulletin de sécurité Microsoft CVE-2026-53133 du 27 juin 2026 Bulletin de sécurité Microsoft CVE-2026-53135 du 27 juin 2026 Bulletin de sécurité Microsoft CVE-2026-53143 du 27 juin 2026 Bulletin de sécurité Microsoft CVE-2026-53146 du 27 juin 2026 Bulletin de sécurité Microsoft CVE-2026-53147 du 27 juin 2026 Bulletin de sécurité Microsoft CVE-2026-53148 du 27 juin 2026 Bulletin de sécurité Microsoft CVE-2026-53149 du 27 juin 2026 Bulletin de s

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2026-023066LinuxのLinux Kernelにおける境界外読み取りに関する脆弱性

Linuxカーネルにおいて、以下の脆弱性が修正されました。netfilterのnf_logにおいて、MACヘッダーが設定されていることを確認してからダンプするdump_mac_header()のフォールバックパスは、skb_mac_header_was_set()をチェックせずに「skb-＞mac_header != skb-＞network_header」のみでMACヘッダーへのアクセスを保護しています。MACヘッダーが設定されていない場合、mac_headerは0xffffとなり、そのためテストは通過し、skb_mac_header(skb)はskb-＞head + 0xffffを返します。これはバッファの約64KiB先に相当し、ループはdev-＞hard_header_lenバイトをカーネルログに境界外読み込みしてしまいます。この問題はnetdevロガー経由で到達可能です。nf_log_unknown_packet()はdump_mac_header()を無条件に呼び出しており、PACKET_QDISC_BYPASSを用いてAF_PACKET経由で送信されたskbはmac_headerが未設定のまま出力フックに到達します（mac_headerをリセットする__dev_queue_xmit()はバイパスされます）。ARPHRD_ETHERパスで既に使われているskb_mac_header_was_set()チェックを追加し、ハードコードされたMACヘッダー長のチェックをskb_mac_header_len()に置き換えました。影響を受けるのはMACヘッダーが未設定のskbのみで、有効なものは以前と同様にダンプされます。BUG: KASANによりdump_mac_header (net/netfilter/nf_log_syslog.c:831)でのスラブ境界外アクセスサイズ1の読み込みがアドレスffff88800ea49d3fで発生し、タスクexploit/148によって呼び出されました。コールトレースは以下の通りです。kasan_report (mm/kasan/report.c:595)、dump_mac_header (net/netfilter/nf_log_syslog.c:831)、nf_log_netdev_packet (net/netfilter/nf_log_syslog.c:938, net/netfilter/nf_log_syslog.c:963)、nf_log_packet (net/netfilter/nf_log.c:260)、nft_log_eval (net/netfilter/nft_log.c:60)、nft_do_chain (net/netfilter/nf_tables_core.c:285)、nft_do_chain_netdev (net/netfilter/nft_chain_filter.c:307)、nf_hook_slow (net/netfilter/core.c:619)、nf_hook_direct_egress (net/packet/af_packet.c:257)、packet_xmit (net/packet/af_packet.c:280)、packet_sendmsg (net/packet/af_packet.c:3114)、__sys_sendto (net/socket.c:2265)です。

Official advisory ↗
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Fix availability varies by product
Affected
Fixed
Linux: < 2.6.36, 5.10.261 ≤ 5.10.*, 5.15.210 ≤ 5.15.*, 6.1.176 ≤ 6.1.*, 6.6.143 ≤ 6.6.*, 6.12.94 ≤ 6.12.*, 6.18.36 ≤ 6.18.*, 7.0.13 ≤ 7.0.*, 7.1 ≤ *
Action
Use the product-specific evidence above. Patch only products with a verified fixed release, and keep every affected or under-investigation state without a matching fix in the remediation queue.
Workaround
No verified workaround is recorded. Limit untrusted access and use least privilege until authoritative guidance is available.
04

Evidence and provenance

Published 24 Jun 2026 · Last source change 8 Sept 2026, 08:49 UTC · CWE-125 · Out-of-bounds Read

CVE recordCVE.org · 5.2
CVSS sourceCNA
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-08-14
European sourceENISA EUVD · EUVD-2026-38712
Product sourceVendor CSAF · SUSE Product Security Team
Remediation sourceVendor CSAF · SUSE Product Security Team
CWE sourceNIST NVD
NVD statusNVD modified after enrichment

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates ↗
  1. Affected versionsThe structured affected or fixed version information changed.
    Before
    7eb9282cd0efac08b8377cbd5037ba297c77e3f7 < 2e96e1bc9b4d5450e6c33f078e19a9bc1dda6c0b; 7eb9282cd0efac08b8377cbd5037ba297c77e3f7 < d704ee9c7bc68a161684c51a7ac05b446dcf38d4; 7eb9282cd0efac08b8377cbd5037ba297c77e3f7 < befb8968a2abdfa948d5600ea7f7a509a292a590; 7eb9282cd0efac08b8377cbd5037ba297c77e3f7 < 8a81e336da685423f5b64aac4d571e63d674c52a; 7eb9282cd0efac08b8377cbd5037ba297c77e3f7 < c38d41134085193efd5b237cf513ad5b3421a60d; 7eb9282cd0efac08b8377cbd5037ba297c77e3f7 < af1b7699466f6556b351fa25d3dc870abfb5d310; 7eb9282cd0efac08b8377cbd5037ba297c77e3f7 < 65ef7397eb9a296e91839f5fd10be96f23d332e7; 7eb9282cd0efac08b8377cbd5037ba297c77e3f7 < a84b6fedbc97078788be78dbdd7517d143ad1a77 · Fixed: < 2.6.36; 5.10.261 ≤ 5.10.*; 5.15.210 ≤ 5.15.*; 6.1.176 ≤ 6.1.*; 6.6.143 ≤ 6.6.*; 6.12.94 ≤ 6.12.*; 6.18.36 ≤ 6.18.*; 7.0.13 ≤ 7.0.*
    After
    Linux: 7eb9282cd0efac08b8377cbd5037ba297c77e3f7 < 2e96e1bc9b4d5450e6c33f078e19a9bc1dda6c0b, 7eb9282cd0efac08b8377cbd5037ba297c77e3f7 < d704ee9c7bc68a161684c51a7ac05b446dcf38d4, 7eb9282cd0efac08b8377cbd5037ba297c77e3f7 < befb8968a2abdfa948d5600ea7f7a509a292a590, 7eb9282cd0efac08b8377cbd5037ba297c77e3f7 < 8a81e336da685423f5b64aac4d571e63d674c52a, 7eb9282cd0efac08b8377cbd5037ba297c77e3f7 < c38d41134085193efd5b237cf513ad5b3421a60d, 7eb9282cd0efac08b8377cbd5037ba297c77e3f7 < af1b7699466f6556b351fa25d3dc870abfb5d310, 7eb9282cd0efac08b8377cbd5037ba297c77e3f7 < 65ef7397eb9a296e91839f5fd10be96f23d332e7, 7eb9282cd0efac08b8377cbd5037ba297c77e3f7 < a84b6fedbc97078788be78dbdd7517d143ad1a77, 2.6.36 · Fixed: Linux: < 2.6.36, 5.10.261 ≤ 5.10.*, 5.15.210 ≤ 5.15.*, 6.1.176 ≤ 6.1.*, 6.6.143 ≤ 6.6.*, 6.12.94 ≤ 6.12.*, 6.18.36 ≤ 6.18.*, 7.0.13 ≤ 7.0.*, 7.1 ≤ *
    CNA ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Fixed release or patch reference recorded
ENISA EUVD · EUVD-2026-38712↗Vendor CSAF · SUSE Product Security Team↗Patch or update reference↗Patch or update reference↗Patch or update reference↗Patch or update reference↗CVE authority or vendor reference↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2026-52942 · cve.blacktree.nl