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Full vulnerability report · 2025
CVE-2023-53802High confidence

wifi: ath9k: htc_hst: free skb in ath9k_htc_rx_msg() if there is no callback function

Linux · Linux

UnscoredAssess manually
Recommended action
Needs assessment

No CVSS base score is available from the CNA, CISA ADP or NIST. Absence of a score is not evidence of low risk; review the vendor advisory, affected exposure and exploit evidence.

Patch available
Distribution package intelligence

Ubuntu vendor package status

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

9 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 archivelinux-azure-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-gcp-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-hwe-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-lowlatency-hwe-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-nvidia-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-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-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
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-2023-60104

No EUVD known-exploited evidence

ENISA has published the identifier mapping but no EUVD description has been stored yet.

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
Not supplied in the stored EUVD record
Advisory evidence
No linked advisory details stored yet
Recommended actionNeeds assessment

No CVSS base score is available from the CNA, CISA ADP or NIST. Absence of a score is not evidence of low risk; review the vendor advisory, affected exposure and exploit evidence.

Patch available
01

What, why and how

In the Linux kernel, the following vulnerability has been resolved: wifi: ath9k: htc_hst: free skb in ath9k_htc_rx_msg() if there is no callback function It is stated that ath9k_htc_rx_msg() either frees the provided skb or passes its management to another callback function. However, the skb is not freed in case there is no another callback function, and Syzkaller was able to cause a memory leak. Also minor comment fix. Found by Linux Verification Center (linuxtesting.org) with Syzkaller.

What

In the Linux kernel, the following vulnerability has been resolved: wifi: ath9k: htc_hst: free skb in ath9k_htc_rx_msg() if there is no callback function It is stated that ath9k_htc_rx_msg() either frees the provided skb or passes its management to another callback function. However, the skb is not freed in case there is no another callback function, and Syzkaller was able to cause a memory leak. Also minor comment fix. Found by Linux Verification Center (linuxtesting.org) with Syzkaller.

Why

The current structured CVE record identifies a security weakness, but the root cause requires confirmation in the linked vendor material.

How

An attacker operating through the affected interface may attempt exploitation when the stated preconditions are met. 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: wifi: ath9k: htc_hst: free skb in ath9k_htc_rx_msg() if there is no callback function It is stated that ath9k_htc_rx_msg() either frees the provided skb or passes its management to another callback function. However, the skb is not freed in case there is no another callback function, and Syzkaller was able to cause a memory leak. Also minor comment fix. Found by Linux Verification Center (linuxtesting.org) with Syzkaller.

Why

The current structured CVE record identifies a security weakness, but the root cause requires confirmation in the linked vendor material.

How

An attacker operating through the affected interface may attempt exploitation when the stated preconditions are met. 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
the affected interface → vulnerable operation → cause the confidentiality, integrity or availability impact described by the vendor
Attack surface
Unspecified
Privileges required
Not stated in the selected CVSS metric
User interaction
Not stated in the selected CVSS metric
Attack complexity
Not stated in the selected CVSS metric
Security boundary
Not stated in the selected CVSS metric
Weakness
?CWE means Common Weakness Enumeration.
CWE not yet assigned
CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
Not available from the selected scoring authority.
Post-exploitation / living off the land
No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.
A

Official authority intelligence

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

BSI · German · WID-SEC-W-2025-2765Linux Kernel: Mehrere Schwachstellen ermöglichen Denial of Service

Ein lokaler Angreifer kann mehrere Schwachstellen in Linux Kernel ausnutzen, um einen Denial of Service Angriff durchzuführen.

Official advisory
CERT-FR · French · CERTFR-2026-AVI-0369Multiples vulnérabilités dans le noyau Linux de SUSE

d?id=CVE-2023-53785 Référence CVE CVE-2023-53787 https://www.cve.org/CVERecord?id=CVE-2023-53787 Référence CVE CVE-2023-53791 https://www.cve.org/CVERecord?id=CVE-2023-53791 Référence CVE CVE-2023-53792 https://www.cve.org/CVERecord?id=CVE-2023-53792 Référence CVE CVE-2023-53793 https://www.cve.org/CVERecord?id=CVE-2023-53793 Référence CVE CVE-2023-53794 https://www.cve.org/CVERecord?id=CVE-2023-53794 Référence CVE CVE-2023-53795 https://www.cve.org/CVERecord?id=CVE-2023-53795 Référence CVE CVE-2023-53797 https://www.cve.org/CVERecord?id=CVE-2023-53797 Référence CVE CVE-2023-53799 https://www.cve.org/CVERecord?id=CVE-2023-53799 Référence CVE CVE-2023-53802 https://www.cve.org/CVERecord?id=CVE-2023-53802 Référence CVE CVE-2023-53807 https://www.cve.org/CVERecord?id=CVE-2023-53807 Référence CVE CVE-2023-53808 https://www.cve.org/CVERecord?id=CVE-2023-53808 Référence CVE CVE-2023-53813 https://www.cve.org/CVERecord?id=CVE-2023-53813 Référence CVE CVE-2023-53815 https://www.cve.org/CVERecord?id=CVE-2023-53815 Référence CVE CVE-2023-53816 https://www.cve.org/CVERecord?id=CVE-2023-53816 Référence CVE CVE-2023-53817 https://www.cve.org/CVERecord?id=CVE-2023-53817 Référence CVE CVE-2023-53819 https://www.cve.org/CVERecord?id=CVE-2023-53819 Référence CVE CVE-2023-53821 https://www.cve.org/CVERecord?id=

Official advisory
CERT-FR · French · CERTFR-2026-AVI-0225Multiples vulnérabilités dans le noyau Linux de SUSE

d?id=CVE-2023-53787 Référence CVE CVE-2023-53788 https://www.cve.org/CVERecord?id=CVE-2023-53788 Référence CVE CVE-2023-53791 https://www.cve.org/CVERecord?id=CVE-2023-53791 Référence CVE CVE-2023-53792 https://www.cve.org/CVERecord?id=CVE-2023-53792 Référence CVE CVE-2023-53793 https://www.cve.org/CVERecord?id=CVE-2023-53793 Référence CVE CVE-2023-53794 https://www.cve.org/CVERecord?id=CVE-2023-53794 Référence CVE CVE-2023-53795 https://www.cve.org/CVERecord?id=CVE-2023-53795 Référence CVE CVE-2023-53797 https://www.cve.org/CVERecord?id=CVE-2023-53797 Référence CVE CVE-2023-53799 https://www.cve.org/CVERecord?id=CVE-2023-53799 Référence CVE CVE-2023-53802 https://www.cve.org/CVERecord?id=CVE-2023-53802 Référence CVE CVE-2023-53803 https://www.cve.org/CVERecord?id=CVE-2023-53803 Référence CVE CVE-2023-53804 https://www.cve.org/CVERecord?id=CVE-2023-53804 Référence CVE CVE-2023-53807 https://www.cve.org/CVERecord?id=CVE-2023-53807 Référence CVE CVE-2023-53808 https://www.cve.org/CVERecord?id=CVE-2023-53808 Référence CVE CVE-2023-53811 https://www.cve.org/CVERecord?id=CVE-2023-53811 Référence CVE CVE-2023-53813 https://www.cve.org/CVERecord?id=CVE-2023-53813 Référence CVE CVE-2023-53814 https://www.cve.org/CVERecord?id=CVE-2023-53814 Référence CVE CVE-2023-53815 https://www.cve.org/CVERecord?id=

Official advisory
CERT-FR · French · CERTFR-2026-AVI-0170Multiples vulnérabilités dans le noyau Linux de SUSE

d?id=CVE-2023-53755 Référence CVE CVE-2023-53761 https://www.cve.org/CVERecord?id=CVE-2023-53761 Référence CVE CVE-2023-53766 https://www.cve.org/CVERecord?id=CVE-2023-53766 Référence CVE CVE-2023-53781 https://www.cve.org/CVERecord?id=CVE-2023-53781 Référence CVE CVE-2023-53783 https://www.cve.org/CVERecord?id=CVE-2023-53783 Référence CVE CVE-2023-53786 https://www.cve.org/CVERecord?id=CVE-2023-53786 Référence CVE CVE-2023-53788 https://www.cve.org/CVERecord?id=CVE-2023-53788 Référence CVE CVE-2023-53792 https://www.cve.org/CVERecord?id=CVE-2023-53792 Référence CVE CVE-2023-53794 https://www.cve.org/CVERecord?id=CVE-2023-53794 Référence CVE CVE-2023-53802 https://www.cve.org/CVERecord?id=CVE-2023-53802 Référence CVE CVE-2023-53803 https://www.cve.org/CVERecord?id=CVE-2023-53803 Référence CVE CVE-2023-53804 https://www.cve.org/CVERecord?id=CVE-2023-53804 Référence CVE CVE-2023-53808 https://www.cve.org/CVERecord?id=CVE-2023-53808 Référence CVE CVE-2023-53811 https://www.cve.org/CVERecord?id=CVE-2023-53811 Référence CVE CVE-2023-53814 https://www.cve.org/CVERecord?id=CVE-2023-53814 Référence CVE CVE-2023-53818 https://www.cve.org/CVERecord?id=CVE-2023-53818 Référence CVE CVE-2023-53819 https://www.cve.org/CVERecord?id=CVE-2023-53819 Référence CVE CVE-2023-53820 https://www.cve.org/CVERecord?id=

Official advisory
CERT-FR · French · CERTFR-2026-AVI-0108Multiples vulnérabilités dans le noyau Linux de SUSE

d?id=CVE-2023-53788 Référence CVE CVE-2023-53791 https://www.cve.org/CVERecord?id=CVE-2023-53791 Référence CVE CVE-2023-53792 https://www.cve.org/CVERecord?id=CVE-2023-53792 Référence CVE CVE-2023-53793 https://www.cve.org/CVERecord?id=CVE-2023-53793 Référence CVE CVE-2023-53794 https://www.cve.org/CVERecord?id=CVE-2023-53794 Référence CVE CVE-2023-53795 https://www.cve.org/CVERecord?id=CVE-2023-53795 Référence CVE CVE-2023-53797 https://www.cve.org/CVERecord?id=CVE-2023-53797 Référence CVE CVE-2023-53799 https://www.cve.org/CVERecord?id=CVE-2023-53799 Référence CVE CVE-2023-53801 https://www.cve.org/CVERecord?id=CVE-2023-53801 Référence CVE CVE-2023-53802 https://www.cve.org/CVERecord?id=CVE-2023-53802 Référence CVE CVE-2023-53803 https://www.cve.org/CVERecord?id=CVE-2023-53803 Référence CVE CVE-2023-53804 https://www.cve.org/CVERecord?id=CVE-2023-53804 Référence CVE CVE-2023-53806 https://www.cve.org/CVERecord?id=CVE-2023-53806 Référence CVE CVE-2023-53807 https://www.cve.org/CVERecord?id=CVE-2023-53807 Référence CVE CVE-2023-53808 https://www.cve.org/CVERecord?id=CVE-2023-53808 Référence CVE CVE-2023-53809 https://www.cve.org/CVERecord?id=CVE-2023-53809 Référence CVE CVE-2023-53811 https://www.cve.org/CVERecord?id=CVE-2023-53811 Référence CVE CVE-2023-53813 https://www.cve.org/CVERecord?id=

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
fb9987d0f748c983bb795a86f47522313f701a08 < b11f95f65cc52ee3a756e6f6a88df37a203e25bd; fb9987d0f748c983bb795a86f47522313f701a08 < 68171c006c8645a3e0293a6c3e6037c6538ac1c5; fb9987d0f748c983bb795a86f47522313f701a08 < 564bc2222bf50eb6cdee715a5431bf4dc9f923c1; fb9987d0f748c983bb795a86f47522313f701a08 < ec246dfe006b2a8f36353f7489e4f525114db9a5; fb9987d0f748c983bb795a86f47522313f701a08 < c0c0614f143b568cd0e9525d53cf12e5dcd11987; fb9987d0f748c983bb795a86f47522313f701a08 < 5a84e51f72580fc70066b03f3dac38421e702a0b; fb9987d0f748c983bb795a86f47522313f701a08 < bbfababb4f899fe1556eac195f9774b6fe675fb6; fb9987d0f748c983bb795a86f47522313f701a08 < 9b25e3985477ac3f02eca5fc1e0cc6850a3f7e69
Fixed
< 2.6.35; 4.14.308 ≤ 4.14.*; 4.19.276 ≤ 4.19.*; 5.4.235 ≤ 5.4.*; 5.10.173 ≤ 5.10.*; 5.15.99 ≤ 5.15.*; 6.1.16 ≤ 6.1.*; 6.2.3 ≤ 6.2.*
Action
Review the linked authoritative reference and apply the recorded fixed release appropriate to the affected product branch.
Workaround
No verified workaround is recorded. Limit untrusted access and use least privilege until authoritative guidance is available.
04

Evidence and provenance

Published 9 Dec 2025 · Last source change 11 May 2026, 19:51 UTC · CWE not yet assigned

CVE recordCVE.org · 5.2
CVSS sourceUnavailable
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-2023-60104
Product sourceCNA
Remediation sourceCVE/CNA references
CWE sourceUnavailable
NVD statusNVD not scheduled

Missing structured fields: CVSS base score, CWE classification. Missing data is not evidence of low risk; review the primary advisory.

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
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-2023-53802 · cve.blacktree.nl