CVE-2026-23318

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.