VulnerabilityPublished 9 Jul 2025Updated 5 Nov 2026

CVE-2025-38249: Linux kernel · ALSA: usb-audio: Fix out-of-bounds read in snd_usb_get_audioformat_uac3()

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in fb4e2a6e8f28a3c0ad382e363aeb9cd822007b8a : update Linux kernel when convenient.

Data as of 5 Nov 2026, 21:19 UTC

Severity

Unrated

Rated by Threat Radar · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none

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 fb4e2a6e8f28a3c0ad382e363aeb9cd822007b8a, c3fb926abe90d86f5e3055e0035f04d9892a118b, 74fcb3852a2f579151ce80b9ed96cd916ba0d5d8 +5

Exploitation evidence

Disclosed: evidence found.
CVE published 9 Jul 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by 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.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 9a2fe9b801f585baccf8352d82839dcd54b300cf, < fb4e2a6e8f28a3c0ad382e363aeb9cd822007b8a	Fixed in fb4e2a6e8f28a3c0ad382e363aeb9cd822007b8a
LinuxLinux	Affected ≥ 9a2fe9b801f585baccf8352d82839dcd54b300cf, < c3fb926abe90d86f5e3055e0035f04d9892a118b	Fixed in c3fb926abe90d86f5e3055e0035f04d9892a118b
LinuxLinux	Affected ≥ 9a2fe9b801f585baccf8352d82839dcd54b300cf, < 74fcb3852a2f579151ce80b9ed96cd916ba0d5d8	Fixed in 74fcb3852a2f579151ce80b9ed96cd916ba0d5d8
LinuxLinux	Affected ≥ 9a2fe9b801f585baccf8352d82839dcd54b300cf, < 24ff7d465c4284529bbfa207757bffb6f44b6403	Fixed in 24ff7d465c4284529bbfa207757bffb6f44b6403
LinuxLinux	Affected ≥ 9a2fe9b801f585baccf8352d82839dcd54b300cf, < 11e740dc1a2c8590eb7074b5c4ab921bb6224c36	Fixed in 11e740dc1a2c8590eb7074b5c4ab921bb6224c36
LinuxLinux	Affected ≥ 9a2fe9b801f585baccf8352d82839dcd54b300cf, < 6eb211788e1370af52a245d4d7da35c374c7b401	Fixed in 6eb211788e1370af52a245d4d7da35c374c7b401

Description

In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: Fix out-of-bounds read in snd_usb_get_audioformat_uac3() In snd_usb_get_audioformat_uac3(), the length value returned from snd_usb_ctl_msg() is used directly for memory allocation without validation. This length is controlled by the USB device. The allocated buffer is cast to a uac3_cluster_header_descriptor and its fields are accessed without verifying that the buffer is large enough. If the device returns a smaller than expected length, this leads to an out-of-bounds read. Add a length check to ensure the buffer is large enough for uac3_cluster_header_descriptor.

References

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