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VulnerabilityPublished Updated

CVE-2025-38729: Linux kernel · ALSA: usb-audio: Validate UAC3 power domain descriptors, too

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in f03418bb9d542f44df78eec2eff4ac83c0a8ac0d : update Linux kernel when convenient.

Data as of 5 Nov 2026, 21:48 UTC

Severity
Medium

Rated Medium by Threat Radar's AI analysis · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none
CISA SSVC
Exploitation
No evidence of active exploitation and no public proof of concept
Automatable
Attackers cannot reliably automate steps 1–4 of the kill chain
Technical impact
Limited control over the software or limited information exposure

CISA SSVC assessment, 2026-11-05.

Patch
Available – fixed in f03418bb9d542f44df78eec2eff4ac83c0a8ac0d, ebc9e06b6ea978a20abf9b87d41afc51b2d745ac, d832ccbc301fbd9e5a1d691bdcf461cdb514595f +6

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 4 Sep 2025

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 5 Nov 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • ≥ 9a2fe9b801f585baccf8352d82839dcd54b300cf, < f03418bb9d542f44df78eec2eff4ac83c0a8ac0d
Fixed in
  • f03418bb9d542f44df78eec2eff4ac83c0a8ac0d
LinuxLinuxAffected
  • ≥ 9a2fe9b801f585baccf8352d82839dcd54b300cf, < ebc9e06b6ea978a20abf9b87d41afc51b2d745ac
Fixed in
  • ebc9e06b6ea978a20abf9b87d41afc51b2d745ac
LinuxLinuxAffected
  • ≥ 9a2fe9b801f585baccf8352d82839dcd54b300cf, < d832ccbc301fbd9e5a1d691bdcf461cdb514595f
Fixed in
  • d832ccbc301fbd9e5a1d691bdcf461cdb514595f
LinuxLinuxAffected
  • ≥ 9a2fe9b801f585baccf8352d82839dcd54b300cf, < cd08d390d15b204cac1d3174f5f149a20c52e61a
Fixed in
  • cd08d390d15b204cac1d3174f5f149a20c52e61a
LinuxLinuxAffected
  • ≥ 9a2fe9b801f585baccf8352d82839dcd54b300cf, < 1666207ba0a5973735ef010812536adde6174e81
Fixed in
  • 1666207ba0a5973735ef010812536adde6174e81
LinuxLinuxAffected
  • ≥ 9a2fe9b801f585baccf8352d82839dcd54b300cf, < 40714daf4d0448e1692c78563faf0ed0f9d9b5c7
Fixed in
  • 40714daf4d0448e1692c78563faf0ed0f9d9b5c7

AI-suggested

A fix is available and has been applied in the Linux kernel. Users and administrators should update to the fixed kernel versions identified by the provided commit hashes to remediate this vulnerability.

Description

A vulnerability in the Linux kernel's ALSA usb-audio driver related to UAC3 power domain descriptors has been fixed. The issue involved insufficient validation of the variable bLength in UAC3 power domain descriptors, which could lead to out-of-bounds (OOB) memory accesses caused by malicious firmware. This flaw has been addressed by adding proper validation to prevent such unexpected accesses.

References

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