In the Linux kernel, the following vulnerability has been resolved:
ALSA: usb-audio: Use correct version for UAC3 header validation
The entry of the validators table for UAC3 AC header descriptor is
defined with the wrong protocol version UAC_VERSION_2, while it should
have been UAC_VERSION_3. This results in the validator never matching
for actual UAC3 devices (protocol == UAC_VERSION_3), causing their
header descriptors to bypass validation entirely. A malicious USB
device presenting a truncated UAC3 header could exploit this to cause
out-of-bounds reads when the driver later accesses unvalidated
descriptor fields.
The bug was introduced in the same commit as the recently fixed UAC3
feature unit sub-type typo, and appears to be from the same copy-paste
error when the UAC3 section was created from the UAC2 section.
| Score | Percentile |
|---|---|
| 0.01% | 2.38% |
| Base score | Version | Severity | Vector |
|---|---|---|---|
| 7.1 | 3.1 | — |
|
| Type | Value |
|---|---|
| GHSA | GHSA-x63j-v2j2-m8fv ↗ |
| CVE | CVE-2026-23318 ↗ |
| CWE id | Name |
|---|---|
| CWE-125 | Out-of-bounds Read |