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Full vulnerability report · 2026
CVE-2026-23397High confidence

nfnetlink_osf: validate individual option lengths in fingerprints

Linux · Linux

7.1HighCVSS 3.1
Recommended action
Within 7 days

High technical severity; prioritise exposed affected systems while verifying vendor guidance.

Patch available
Distribution package intelligence

Ubuntu vendor package status

Canonical’s release and source-package findings are shown separately from local repository availability.

20 package states
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.

Ubuntu releaseSource packageVendor stateFixed versionEvidence
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 record ↗Source updated 8 Sept 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 record ↗Source updated 8 Sept 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 record ↗Source updated 8 Sept 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 record ↗Source updated 8 Sept 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 record ↗Source updated 8 Sept 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 record ↗Source updated 8 Sept 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 record ↗Source updated 8 Sept 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 record ↗Source updated 8 Sept 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 record ↗Source updated 8 Sept 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 record ↗Source updated 8 Sept 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 record ↗Source updated 8 Sept 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 record ↗Source updated 8 Sept 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 record ↗Source updated 8 Sept 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 record ↗Source updated 8 Sept 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 record ↗Source updated 8 Sept 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 record ↗Source updated 8 Sept 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 record ↗Source updated 8 Sept 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 record ↗Source updated 8 Sept 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 record ↗Source updated 8 Sept 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 record ↗Source updated 8 Sept 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.

2 current
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: nfnetlink_osf: validate individual option lengths in fingerprints nfnl_osf_add_callback() validates opt_num bounds and string NUL-termination but does not check individual option length fields. A zero-length option causes nf_osf_match_one() to enter the option matching loop even when foptsize sums to zero, which matches packets with no TCP options where ctx->optp is NULL: Oops: general protection fault KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] RIP: 0010:nf_osf_match_one (net/netfilter/nfnetlink_osf.c:98) Call Trace: nf_osf_match (net/netfilter/nfnetlink_osf.c:227) xt_osf_match_packet (net/netfilter/xt_osf.c:32) ipt_do_table (net/ipv4/netfilter/ip_tables.c:293) nf_hook_slow (net/netfilter/core.c:623) ip_local_deliver (net/ipv4/ip_input.c:262) ip_rcv (net/ipv4/ip_input.c:573) Additionally, an MSS option (kind=2) with length optsize == foptsize check. Reject fingerprints where any option has zero length, or where an MSS option has length less than 4, at add time rather than trusting these values in the packet matching hot path.
Remediation
Limit access to the interactive shell of the additional GNU/Linux subssytem to trusted personnel only.
SSA-082556 · CSAF 2.0 · revision 7 · interimSiemens ProductCERTSSA-082556: Vulnerabilities in the additional GNU/Linux subsystem of the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP V3.1.5
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) >= V3.1.5
  • SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) >= V3.1.5
  • SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) >= V3.1.5
  • SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0) >= V3.1.5
  • SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0) >= V3.1.5
Summary
In the Linux kernel, the following vulnerability has been resolved: nfnetlink_osf: validate individual option lengths in fingerprints nfnl_osf_add_callback() validates opt_num bounds and string NUL-termination but does not check individual option length fields. A zero-length option causes nf_osf_match_one() to enter the option matching loop even when foptsize sums to zero, which matches packets with no TCP options where ctx->optp is NULL: Oops: general protection fault KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] RIP: 0010:nf_osf_match_one (net/netfilter/nfnetlink_osf.c:98) Call Trace: nf_osf_match (net/netfilter/nfnetlink_osf.c:227) xt_osf_match_packet (net/netfilter/xt_osf.c:32) ipt_do_table (net/ipv4/netfilter/ip_tables.c:293) nf_hook_slow (net/netfilter/core.c:623) ip_local_deliver (net/ipv4/ip_input.c:262) ip_rcv (net/ipv4/ip_input.c:573) Additionally, an MSS option (kind=2) with length optsize == foptsize check. Reject fingerprints where any option has zero length, or where an MSS option has length less than 4, at add time rather than trusting these values in the packet matching hot path.
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.

Select the national-authority views to include. The exact source language is shown on each matched advisory. Your choice is remembered on this device and encoded in the shareable URL.

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-2026-16157

No EUVD known-exploited evidence

In the Linux kernel, the following vulnerability has been resolved: nfnetlink_osf: validate individual option lengths in fingerprints nfnl_osf_add_callback() validates opt_num bounds and string NUL-termination but does not check individual option length fields. A zero-length option causes nf_osf_match_one() to enter the option matching loop even when foptsize sums to zero, which matches packets with no TCP options where ctx->optp is NULL: Oops: general protection fault KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] RIP: 0010:nf_osf_match_one (net/netfilter/nfnetlink_osf.c:98) Call Trace: nf_osf_match (net/netfilter/nfnetlink_osf.c:227) xt_osf_match_packet (net/netfilter/xt_osf.c:32) ipt_do_table (net/ipv4/netfilter/ip_tables.c:293) nf_hook_slow (net/netfilter/core.c:623) ip_local_deliver (net/ipv4/ip_input.c:262) ip_rcv (net/ipv4/ip_input.c:573) Additionally, an MSS option (kind=2) with length < 4 causes out-of-bounds reads when nf_osf_match_one() unconditionally accesses optp[2] and optp[3] for MSS value extraction. While RFC 9293 section 3.2 specifies that the MSS option is always exactly 4 bytes (Kind=2, Length=4), the check uses "< 4" rather than "!= 4" because lengths greater than 4 do not cause memory safety issues -- the buffer is guaranteed to be at least foptsize bytes by the ctx->optsize == foptsize check. Reject fingerprints where any option has zero length, or where an MSS option has length less than 4, at add time rather than trusting these values in the packet matching hot path.

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
0.0
Advisory evidence
No linked advisory details stored yet
Recommended actionWithin 7 days

High technical severity; prioritise exposed affected systems while verifying vendor guidance.

Patch available
01

What, why and how

In the Linux kernel, the following vulnerability has been resolved: nfnetlink_osf: validate individual option lengths in fingerprints nfnl_osf_add_callback() validates opt_num bounds and string NUL-termination but does not check individual option length fields. A zero-length option causes nf_osf_match_one() to enter the option matching loop even when foptsize sums to zero, which matches packets with no TCP options where ctx->optp is NULL: Oops: general protection fault KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] RIP: 0010:nf_osf_match_one (net/netfilter/nfnetlink_osf.c:98) Call Trace: nf_osf_match (net/netfilter/nfnetlink_osf.c:227) xt_osf_match_packet (net/netfilter/xt_osf.c:32) ipt_do_table (net/ipv4/netfilter/ip_tables.c:293) nf_hook_slow (net/netfilter/core.c:623) ip_local_deliver (net/ipv4/ip_input.c:262) ip_rcv (net/ipv4/ip_input.c:573) Additionally, an MSS option (kind=2) with length < 4 causes out-of-bounds reads when nf_osf_match_one() unconditionally accesses optp[2] and optp[3] for MSS value extraction. While RFC 9293 section 3.2 specifies that the MSS option is always exactly 4 bytes (Kind=2, Length=4), the check uses "< 4" rather than "!= 4" because lengths greater than 4 do not cause memory safety issues -- the buffer is guaranteed to be at least foptsize bytes by the ctx->optsize == foptsize check. Reject fingerprints where any option has zero length, or where an MSS option has length less than 4, at add time rather than trusting these values in the packet matching hot path.

What

In the Linux kernel, the following vulnerability has been resolved: nfnetlink_osf: validate individual option lengths in fingerprints nfnl_osf_add_callback() validates opt_num bounds and string NUL-termination but does not check individual option length fields. A zero-length option causes nf_osf_match_one() to enter the option matching loop even when foptsize sums to zero, which matches packets with no TCP options where ctx->optp is NULL: Oops: general protection fault KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] RIP: 0010:nf_osf_match_one (net/netfilter/nfnetlink_osf.c:98) Call Trace: nf_osf_match (net/netfilter/nfnetlink_osf.c:227) xt_osf_match_packet (net/netfilter/xt_osf.c:32) ipt_do_table (net/ipv4/netfilter/ip_tables.c:293) nf_hook_slow (net/netfilter/core.c:623) ip_local_deliver (net/ipv4/ip_input.c:262) ip_rcv (net/ipv4/ip_input.c:573) Additionally, an MSS option (kind=2) with length < 4 causes out-of-bounds reads when nf_osf_match_one() unconditionally accesses optp[2] and optp[3] for MSS value extraction. While RFC 9293 section 3.2 specifies that the MSS option is always exactly 4 bytes (Kind=2, Length=4), the check uses "< 4" rather than "!= 4" because lengths greater than 4 do not cause memory safety issues -- the buffer is guaranteed to be at least foptsize bytes by the ctx->optsize == foptsize check. Reject fingerprints where any option has zero length, or where an MSS option has length less than 4, at add time rather than trusting these values in the packet matching hot path.

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: nfnetlink_osf: validate individual option lengths in fingerprints nfnl_osf_add_callback() validates opt_num bounds and string NUL-termination but does not check individual option length fields. A zero-length option causes nf_osf_match_one() to enter the option matching loop even when foptsize sums to zero, which matches packets with no TCP options where ctx->optp is NULL: Oops: general protection fault KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] RIP: 0010:nf_osf_match_one (net/netfilter/nfnetlink_osf.c:98) Call Trace: nf_osf_match (net/netfilter/nfnetlink_osf.c:227) xt_osf_match_packet (net/netfilter/xt_osf.c:32) ipt_do_table (net/ipv4/netfilter/ip_tables.c:293) nf_hook_slow (net/netfilter/core.c:623) ip_local_deliver (net/ipv4/ip_input.c:262) ip_rcv (net/ipv4/ip_input.c:573) Additionally, an MSS option (kind=2) with length < 4 causes out-of-bounds reads when nf_osf_match_one() unconditionally accesses optp[2] and optp[3] for MSS value extraction. While RFC 9293 section 3.2 specifies that the MSS option is always exactly 4 bytes (Kind=2, Length=4), the check uses "< 4" rather than "!= 4" because lengths greater than 4 do not cause memory safety issues -- the buffer is guaranteed to be at least foptsize bytes by the ctx->optsize == foptsize check. Reject fingerprints where any option has zero length, or where an MSS option has length less than 4, at add time rather than trusting these values in the packet matching hot path.

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-2026-16157Official EUVD mapping

In the Linux kernel, the following vulnerability has been resolved: nfnetlink_osf: validate individual option lengths in fingerprints nfnl_osf_add_callback() validates opt_num bounds and string NUL-termination but does not check individual option length fields. A zero-length option causes nf_osf_match_one() to enter the option matching loop even when foptsize sums to zero, which matches packets with no TCP options where ctx->optp is NULL: Oops: general protection fault KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] RIP: 0010:nf_osf_match_one (net/netfilter/nfnetlink_osf.c:98) Call Trace: nf_osf_match (net/netfilter/nfnetlink_osf.c:227) xt_osf_match_packet (net/netfilter/xt_osf.c:32) ipt_do_table (net/ipv4/netfilter/ip_tables.c:293) nf_hook_slow (net/netfilter/core.c:623) ip_local_deliver (net/ipv4/ip_input.c:262) ip_rcv (net/ipv4/ip_input.c:573) Additionally, an MSS option (kind=2) with length < 4 causes out-of-bounds reads when nf_osf_match_one() unconditionally accesses optp[2] and optp[3] for MSS value extraction. While RFC 9293 section 3.2 specifies that the MSS option is always exactly 4 bytes (Kind=2, Length=4), the check uses "< 4" rather than "!= 4" because lengths greater than 4 do not cause memory safety issues -- the buffer is guaranteed to be at least foptsize bytes by the ctx->optsize == foptsize check. Reject fingerprints where any option has zero length, or where an MSS option has length less than 4, at add time rather than trusting these values in the packet matching hot path.

Official EUVD record
BSI · German · WID-SEC-W-2026-0879Linux Kernel: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen im Linux Kernel ausnutzen, um einen Denial of Service Zustand herbeizuführen oder einen nicht näher spezifizierten Angriff durchzuführen.

Official advisory
CERT-FR · French · CERTFR-2026-AVI-1093Multiples vulnérabilités dans le noyau Linux d'Ubuntu

d?id=CVE-2026-23372 Référence CVE CVE-2026-23379 https://www.cve.org/CVERecord?id=CVE-2026-23379 Référence CVE CVE-2026-23381 https://www.cve.org/CVERecord?id=CVE-2026-23381 Référence CVE CVE-2026-23382 https://www.cve.org/CVERecord?id=CVE-2026-23382 Référence CVE CVE-2026-23388 https://www.cve.org/CVERecord?id=CVE-2026-23388 Référence CVE CVE-2026-23391 https://www.cve.org/CVERecord?id=CVE-2026-23391 Référence CVE CVE-2026-23392 https://www.cve.org/CVERecord?id=CVE-2026-23392 Référence CVE CVE-2026-23395 https://www.cve.org/CVERecord?id=CVE-2026-23395 Référence CVE CVE-2026-23396 https://www.cve.org/CVERecord?id=CVE-2026-23396 Référence CVE CVE-2026-23397 https://www.cve.org/CVERecord?id=CVE-2026-23397 Référence CVE CVE-2026-23398 https://www.cve.org/CVERecord?id=CVE-2026-23398 Référence CVE CVE-2026-23399 https://www.cve.org/CVERecord?id=CVE-2026-23399 Référence CVE CVE-2026-23401 https://www.cve.org/CVERecord?id=CVE-2026-23401 Référence CVE CVE-2026-23420 https://www.cve.org/CVERecord?id=CVE-2026-23420 Référence CVE CVE-2026-23428 https://www.cve.org/CVERecord?id=CVE-2026-23428 Référence CVE CVE-2026-23434 https://www.cve.org/CVERecord?id=CVE-2026-23434 Référence CVE CVE-2026-23438 https://www.cve.org/CVERecord?id=CVE-2026-23438 Référence CVE CVE-2026-23439 https://www.cve.org/CVERecord?id=

Official advisory
CERT-FR · French · CERTFR-2026-AVI-1066Multiples vulnérabilités dans le noyau Linux d'Ubuntu

d?id=CVE-2026-23383 Référence CVE CVE-2026-23386 https://www.cve.org/CVERecord?id=CVE-2026-23386 Référence CVE CVE-2026-23387 https://www.cve.org/CVERecord?id=CVE-2026-23387 Référence CVE CVE-2026-23388 https://www.cve.org/CVERecord?id=CVE-2026-23388 Référence CVE CVE-2026-23389 https://www.cve.org/CVERecord?id=CVE-2026-23389 Référence CVE CVE-2026-23391 https://www.cve.org/CVERecord?id=CVE-2026-23391 Référence CVE CVE-2026-23392 https://www.cve.org/CVERecord?id=CVE-2026-23392 Référence CVE CVE-2026-23395 https://www.cve.org/CVERecord?id=CVE-2026-23395 Référence CVE CVE-2026-23396 https://www.cve.org/CVERecord?id=CVE-2026-23396 Référence CVE CVE-2026-23397 https://www.cve.org/CVERecord?id=CVE-2026-23397 Référence CVE CVE-2026-23398 https://www.cve.org/CVERecord?id=CVE-2026-23398 Référence CVE CVE-2026-23399 https://www.cve.org/CVERecord?id=CVE-2026-23399 Référence CVE CVE-2026-23401 https://www.cve.org/CVERecord?id=CVE-2026-23401 Référence CVE CVE-2026-23412 https://www.cve.org/CVERecord?id=CVE-2026-23412 Référence CVE CVE-2026-23413 https://www.cve.org/CVERecord?id=CVE-2026-23413 Référence CVE CVE-2026-23414 https://www.cve.org/CVERecord?id=CVE-2026-23414 Référence CVE CVE-2026-23418 https://www.cve.org/CVERecord?id=CVE-2026-23418 Référence CVE CVE-2026-23419 https://www.cve.org/CVERecord?id=

Official advisory
CERT-FR · French · CERTFR-2026-AVI-0985Multiples vulnérabilités dans le noyau Linux d'Ubuntu

d?id=CVE-2026-23372 Référence CVE CVE-2026-23379 https://www.cve.org/CVERecord?id=CVE-2026-23379 Référence CVE CVE-2026-23381 https://www.cve.org/CVERecord?id=CVE-2026-23381 Référence CVE CVE-2026-23382 https://www.cve.org/CVERecord?id=CVE-2026-23382 Référence CVE CVE-2026-23388 https://www.cve.org/CVERecord?id=CVE-2026-23388 Référence CVE CVE-2026-23391 https://www.cve.org/CVERecord?id=CVE-2026-23391 Référence CVE CVE-2026-23392 https://www.cve.org/CVERecord?id=CVE-2026-23392 Référence CVE CVE-2026-23395 https://www.cve.org/CVERecord?id=CVE-2026-23395 Référence CVE CVE-2026-23396 https://www.cve.org/CVERecord?id=CVE-2026-23396 Référence CVE CVE-2026-23397 https://www.cve.org/CVERecord?id=CVE-2026-23397 Référence CVE CVE-2026-23398 https://www.cve.org/CVERecord?id=CVE-2026-23398 Référence CVE CVE-2026-23399 https://www.cve.org/CVERecord?id=CVE-2026-23399 Référence CVE CVE-2026-23401 https://www.cve.org/CVERecord?id=CVE-2026-23401 Référence CVE CVE-2026-23420 https://www.cve.org/CVERecord?id=CVE-2026-23420 Référence CVE CVE-2026-23434 https://www.cve.org/CVERecord?id=CVE-2026-23434 Référence CVE CVE-2026-23438 https://www.cve.org/CVERecord?id=CVE-2026-23438 Référence CVE CVE-2026-23439 https://www.cve.org/CVERecord?id=CVE-2026-23439 Référence CVE CVE-2026-23442 https://www.cve.org/CVERecord?id=

Official advisory
CERT-FR · French · CERTFR-2026-AVI-0954Multiples vulnérabilités dans le noyau Linux d'Ubuntu

d?id=CVE-2026-23383 Référence CVE CVE-2026-23386 https://www.cve.org/CVERecord?id=CVE-2026-23386 Référence CVE CVE-2026-23387 https://www.cve.org/CVERecord?id=CVE-2026-23387 Référence CVE CVE-2026-23388 https://www.cve.org/CVERecord?id=CVE-2026-23388 Référence CVE CVE-2026-23389 https://www.cve.org/CVERecord?id=CVE-2026-23389 Référence CVE CVE-2026-23391 https://www.cve.org/CVERecord?id=CVE-2026-23391 Référence CVE CVE-2026-23392 https://www.cve.org/CVERecord?id=CVE-2026-23392 Référence CVE CVE-2026-23395 https://www.cve.org/CVERecord?id=CVE-2026-23395 Référence CVE CVE-2026-23396 https://www.cve.org/CVERecord?id=CVE-2026-23396 Référence CVE CVE-2026-23397 https://www.cve.org/CVERecord?id=CVE-2026-23397 Référence CVE CVE-2026-23398 https://www.cve.org/CVERecord?id=CVE-2026-23398 Référence CVE CVE-2026-23399 https://www.cve.org/CVERecord?id=CVE-2026-23399 Référence CVE CVE-2026-23401 https://www.cve.org/CVERecord?id=CVE-2026-23401 Référence CVE CVE-2026-23412 https://www.cve.org/CVERecord?id=CVE-2026-23412 Référence CVE CVE-2026-23413 https://www.cve.org/CVERecord?id=CVE-2026-23413 Référence CVE CVE-2026-23414 https://www.cve.org/CVERecord?id=CVE-2026-23414 Référence CVE CVE-2026-23418 https://www.cve.org/CVERecord?id=CVE-2026-23418 Référence CVE CVE-2026-23419 https://www.cve.org/CVERecord?id=

Official advisory
CERT-FR · French · CERTFR-2026-AVI-0926Multiples vulnérabilités dans le noyau Linux d'Ubuntu

d?id=CVE-2026-23383 Référence CVE CVE-2026-23386 https://www.cve.org/CVERecord?id=CVE-2026-23386 Référence CVE CVE-2026-23387 https://www.cve.org/CVERecord?id=CVE-2026-23387 Référence CVE CVE-2026-23388 https://www.cve.org/CVERecord?id=CVE-2026-23388 Référence CVE CVE-2026-23389 https://www.cve.org/CVERecord?id=CVE-2026-23389 Référence CVE CVE-2026-23391 https://www.cve.org/CVERecord?id=CVE-2026-23391 Référence CVE CVE-2026-23392 https://www.cve.org/CVERecord?id=CVE-2026-23392 Référence CVE CVE-2026-23395 https://www.cve.org/CVERecord?id=CVE-2026-23395 Référence CVE CVE-2026-23396 https://www.cve.org/CVERecord?id=CVE-2026-23396 Référence CVE CVE-2026-23397 https://www.cve.org/CVERecord?id=CVE-2026-23397 Référence CVE CVE-2026-23398 https://www.cve.org/CVERecord?id=CVE-2026-23398 Référence CVE CVE-2026-23399 https://www.cve.org/CVERecord?id=CVE-2026-23399 Référence CVE CVE-2026-23401 https://www.cve.org/CVERecord?id=CVE-2026-23401 Référence CVE CVE-2026-23412 https://www.cve.org/CVERecord?id=CVE-2026-23412 Référence CVE CVE-2026-23413 https://www.cve.org/CVERecord?id=CVE-2026-23413 Référence CVE CVE-2026-23414 https://www.cve.org/CVERecord?id=CVE-2026-23414 Référence CVE CVE-2026-23418 https://www.cve.org/CVERecord?id=CVE-2026-23418 Référence CVE CVE-2026-23419 https://www.cve.org/CVERecord?id=

Official advisory
CERT-FR · French · CERTFR-2026-AVI-0880Multiples vulnérabilités dans les produits Siemens

26-23084, CVE-2026-23086, CVE-2026-23087, CVE-2026-23095, CVE-2026-23100, CVE-2026-23103, CVE-2026-23110, CVE-2026-23111, CVE-2026-23113, CVE-2026-23154, CVE-2026-23204, CVE-2026-23231, CVE-2026-23242, CVE-2026-23243, CVE-2026-23245, CVE-2026-23270, CVE-2026-23271, CVE-2026-23273, CVE-2026-23274, CVE-2026-23277, CVE-2026-23284, CVE-2026-23287, CVE-2026-23290, CVE-2026-23293, CVE-2026-23300, CVE-2026-23304, CVE-2026-23319, CVE-2026-23321, CVE-2026-23335, CVE-2026-23340, CVE-2026-23343, CVE-2026-23351, CVE-2026-23359, CVE-2026-23365, CVE-2026-23368, CVE-2026-23370, CVE-2026-23378, CVE-2026-23379, CVE-2026-23381, CVE-2026-23391, CVE-2026-23392, CVE-2026-23397, CVE-2026-23398, CVE-2026-23414, CVE-2026-23422, CVE-2026-23434, CVE-2026-23438, CVE-2026-23439, CVE-2026-23446, CVE-2026-23449, CVE-2026-23450, CVE-2026-23452, CVE-2026-23454, CVE-2026-23455, CVE-2026-23456, CVE-2026-23457, CVE-2026-23458, CVE-2026-23463, CVE-2026-23474, CVE-2026-23475, CVE-2026-27135, CVE-2026-31389, CVE-2026-31391, CVE-2026-31396, CVE-2026-31402, CVE-2026-31403, CVE-2026-31411, CVE-2026-31414, CVE-2026-31415, CVE-2026-31416, CVE-2026-31417, CVE-2026-31418, CVE-2026-31421, CVE-2026-31422, CVE-2026-31423, CVE-2026-31424, CVE-2026-31427, CVE-2026-31428, CVE-2026-31431, CVE-2026-31441, CVE-2026-31446, CVE-2026-31447, CVE-2026

Official advisory
CERT-FR · French · CERTFR-2026-AVI-0696Multiples vulnérabilités dans le noyau Linux de Debian LTS

d?id=CVE-2026-23368 Référence CVE CVE-2026-23372 https://www.cve.org/CVERecord?id=CVE-2026-23372 Référence CVE CVE-2026-23379 https://www.cve.org/CVERecord?id=CVE-2026-23379 Référence CVE CVE-2026-23381 https://www.cve.org/CVERecord?id=CVE-2026-23381 Référence CVE CVE-2026-23382 https://www.cve.org/CVERecord?id=CVE-2026-23382 Référence CVE CVE-2026-23388 https://www.cve.org/CVERecord?id=CVE-2026-23388 Référence CVE CVE-2026-23391 https://www.cve.org/CVERecord?id=CVE-2026-23391 Référence CVE CVE-2026-23395 https://www.cve.org/CVERecord?id=CVE-2026-23395 Référence CVE CVE-2026-23396 https://www.cve.org/CVERecord?id=CVE-2026-23396 Référence CVE CVE-2026-23397 https://www.cve.org/CVERecord?id=CVE-2026-23397 Référence CVE CVE-2026-23398 https://www.cve.org/CVERecord?id=CVE-2026-23398 Référence CVE CVE-2026-23420 https://www.cve.org/CVERecord?id=CVE-2026-23420 Référence CVE CVE-2026-23434 https://www.cve.org/CVERecord?id=CVE-2026-23434 Référence CVE CVE-2026-23439 https://www.cve.org/CVERecord?id=CVE-2026-23439 Référence CVE CVE-2026-23446 https://www.cve.org/CVERecord?id=CVE-2026-23446 Référence CVE CVE-2026-23452 https://www.cve.org/CVERecord?id=CVE-2026-23452 Référence CVE CVE-2026-23455 https://www.cve.org/CVERecord?id=CVE-2026-23455 Référence CVE CVE-2026-23456 https://www.cve.org/CVERecord?id=

Official advisory
CERT-FR · French · CERTFR-2026-AVI-0697Multiples vulnérabilités dans le noyau Linux de SUSE

d?id=CVE-2026-23378 Référence CVE CVE-2026-23382 https://www.cve.org/CVERecord?id=CVE-2026-23382 Référence CVE CVE-2026-23383 https://www.cve.org/CVERecord?id=CVE-2026-23383 Référence CVE CVE-2026-23387 https://www.cve.org/CVERecord?id=CVE-2026-23387 Référence CVE CVE-2026-23391 https://www.cve.org/CVERecord?id=CVE-2026-23391 Référence CVE CVE-2026-23392 https://www.cve.org/CVERecord?id=CVE-2026-23392 Référence CVE CVE-2026-23393 https://www.cve.org/CVERecord?id=CVE-2026-23393 Référence CVE CVE-2026-23395 https://www.cve.org/CVERecord?id=CVE-2026-23395 Référence CVE CVE-2026-23396 https://www.cve.org/CVERecord?id=CVE-2026-23396 Référence CVE CVE-2026-23397 https://www.cve.org/CVERecord?id=CVE-2026-23397 Référence CVE CVE-2026-23399 https://www.cve.org/CVERecord?id=CVE-2026-23399 Référence CVE CVE-2026-23401 https://www.cve.org/CVERecord?id=CVE-2026-23401 Référence CVE CVE-2026-23403 https://www.cve.org/CVERecord?id=CVE-2026-23403 Référence CVE CVE-2026-23404 https://www.cve.org/CVERecord?id=CVE-2026-23404 Référence CVE CVE-2026-23405 https://www.cve.org/CVERecord?id=CVE-2026-23405 Référence CVE CVE-2026-23406 https://www.cve.org/CVERecord?id=CVE-2026-23406 Référence CVE CVE-2026-23407 https://www.cve.org/CVERecord?id=CVE-2026-23407 Référence CVE CVE-2026-23408 https://www.cve.org/CVERecord?id=

Official advisory
CERT-FR · French · CERTFR-2026-AVI-0548Multiples vulnérabilités dans le noyau Linux de Debian

d?id=CVE-2026-23386 Référence CVE CVE-2026-23387 https://www.cve.org/CVERecord?id=CVE-2026-23387 Référence CVE CVE-2026-23388 https://www.cve.org/CVERecord?id=CVE-2026-23388 Référence CVE CVE-2026-23389 https://www.cve.org/CVERecord?id=CVE-2026-23389 Référence CVE CVE-2026-23391 https://www.cve.org/CVERecord?id=CVE-2026-23391 Référence CVE CVE-2026-23392 https://www.cve.org/CVERecord?id=CVE-2026-23392 Référence CVE CVE-2026-23393 https://www.cve.org/CVERecord?id=CVE-2026-23393 Référence CVE CVE-2026-23395 https://www.cve.org/CVERecord?id=CVE-2026-23395 Référence CVE CVE-2026-23396 https://www.cve.org/CVERecord?id=CVE-2026-23396 Référence CVE CVE-2026-23397 https://www.cve.org/CVERecord?id=CVE-2026-23397 Référence CVE CVE-2026-23398 https://www.cve.org/CVERecord?id=CVE-2026-23398 Référence CVE CVE-2026-23399 https://www.cve.org/CVERecord?id=CVE-2026-23399 Référence CVE CVE-2026-23401 https://www.cve.org/CVERecord?id=CVE-2026-23401 Référence CVE CVE-2026-23412 https://www.cve.org/CVERecord?id=CVE-2026-23412 Référence CVE CVE-2026-23413 https://www.cve.org/CVERecord?id=CVE-2026-23413 Référence CVE CVE-2026-23414 https://www.cve.org/CVERecord?id=CVE-2026-23414 Référence CVE CVE-2026-23417 https://www.cve.org/CVERecord?id=CVE-2026-23417 Référence CVE CVE-2026-23419 https://www.cve.org/CVERecord?id=

Official advisory
CERT-FR · French · CERTFR-2026-AVI-0547Multiples vulnérabilités dans le noyau Linux de Debian LTS

d?id=CVE-2026-23378 Référence CVE CVE-2026-23379 https://www.cve.org/CVERecord?id=CVE-2026-23379 Référence CVE CVE-2026-23381 https://www.cve.org/CVERecord?id=CVE-2026-23381 Référence CVE CVE-2026-23382 https://www.cve.org/CVERecord?id=CVE-2026-23382 Référence CVE CVE-2026-23388 https://www.cve.org/CVERecord?id=CVE-2026-23388 Référence CVE CVE-2026-23391 https://www.cve.org/CVERecord?id=CVE-2026-23391 Référence CVE CVE-2026-23392 https://www.cve.org/CVERecord?id=CVE-2026-23392 Référence CVE CVE-2026-23395 https://www.cve.org/CVERecord?id=CVE-2026-23395 Référence CVE CVE-2026-23396 https://www.cve.org/CVERecord?id=CVE-2026-23396 Référence CVE CVE-2026-23397 https://www.cve.org/CVERecord?id=CVE-2026-23397 Référence CVE CVE-2026-23398 https://www.cve.org/CVERecord?id=CVE-2026-23398 Référence CVE CVE-2026-23401 https://www.cve.org/CVERecord?id=CVE-2026-23401 Référence CVE CVE-2026-23414 https://www.cve.org/CVERecord?id=CVE-2026-23414 Référence CVE CVE-2026-23420 https://www.cve.org/CVERecord?id=CVE-2026-23420 Référence CVE CVE-2026-23422 https://www.cve.org/CVERecord?id=CVE-2026-23422 Référence CVE CVE-2026-23426 https://www.cve.org/CVERecord?id=CVE-2026-23426 Référence CVE CVE-2026-23428 https://www.cve.org/CVERecord?id=CVE-2026-23428 Référence CVE CVE-2026-23434 https://www.cve.org/CVERecord?id=

Official advisory
CERT-FR · French · CERTFR-2026-AVI-0376Multiples vulnérabilités dans les produits Microsoft

ulletin de sécurité Microsoft CVE-2026-23370 du 26 mars 2026 Bulletin de sécurité Microsoft CVE-2026-23379 du 26 mars 2026 Bulletin de sécurité Microsoft CVE-2026-23381 du 26 mars 2026 Bulletin de sécurité Microsoft CVE-2026-23382 du 26 mars 2026 Bulletin de sécurité Microsoft CVE-2026-23388 du 26 mars 2026 Bulletin de sécurité Microsoft CVE-2026-23390 du 26 mars 2026 Bulletin de sécurité Microsoft CVE-2026-23391 du 26 mars 2026 Bulletin de sécurité Microsoft CVE-2026-23392 du 26 mars 2026 Bulletin de sécurité Microsoft CVE-2026-23395 du 26 mars 2026 Bulletin de sécurité Microsoft CVE-2026-23396 du 27 mars 2026 Bulletin de sécurité Microsoft CVE-2026-23397 du 27 mars 2026 Bulletin de sécurité Microsoft CVE-2026-23398 du 27 mars 2026 Bulletin de sécurité Microsoft CVE-2026-27651 du 27 mars 2026 Bulletin de sécurité Microsoft CVE-2026-27654 du 27 mars 2026 Bulletin de sécurité Microsoft CVE-2026-27784 du 27 mars 2026 Bulletin de sécurité Microsoft CVE-2026-28753 du 27 mars 2026 Bulletin de sécurité Microsoft CVE-2026-28755 du 27 mars 2026 Bulletin de sécurité Microsoft CVE-2026-32647 du 27 mars 2026 Bulletin de sécurité Microsoft CVE-2026-32748 du 27 mars 2026 Bulletin de sécurité Microsoft CVE-2026-33515 du 27 mars 2026 Bulletin de sécurité Microsoft CVE-2026-33526 du 27 mars 2026 Bulletin de s

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.
Patch available
Affected
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
Fixed
< 2.6.31; 5.10.253 ≤ 5.10.*; 5.15.203 ≤ 5.15.*; 6.1.167 ≤ 6.1.*; 6.6.130 ≤ 6.6.*; 6.12.78 ≤ 6.12.*; 6.18.20 ≤ 6.18.*; 6.19.10 ≤ 6.19.*
Action
Review the linked authoritative reference and apply the recorded fixed release appropriate to the affected product branch.
Workaround
Limit access to the interactive shell of the additional GNU/Linux subssytem to trusted personnel only.
04

Evidence and provenance

Published 26 Mar 2026 · Last source change 8 Sept 2026, 08:45 UTC · CWE-125 · Out-of-bounds Read

CVE recordCVE.org · 5.2
CVSS sourceNIST NVD
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-2026-16157
Product sourceVendor CSAF · Siemens ProductCERT
Remediation sourceVendor CSAF · Siemens ProductCERT
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 →

No material field changes have been recorded since change tracking began. Routine source refreshes and cosmetic edits are intentionally excluded.

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-2026-16157↗Vendor CSAF · Siemens ProductCERT↗CVE authority or vendor reference↗Patch or update reference↗Patch or update reference↗Patch or update 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-2026-23397 · cve.blacktree.nl