PT-2026-27683 · Linux · Linux

Published 2026-03-25 · Updated 2026-03-25 · CVE-2026-23318

NVD

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.

Related Identifiers

CVE-2026-23318

Affected Products

Linux

References · 7

• https://nvd.nist.gov/vuln/detail/CVE-2026-23318 · Security Note
• https://git.kernel.org/stable/c/1e5753ff4c2e86aa88516f97a224c90a3d0b133e · Note
• https://git.kernel.org/stable/c/d3904ca40515272681ae61ad6f561c24f190957f · Note
• https://git.kernel.org/stable/c/0dcd1ed96c03459cf14706885c9dd3c1fd8bd29f · Note
• https://git.kernel.org/stable/c/499ffd15b00dc91ac95c28f76959dfb5cdcc84d5 · Note
• https://git.kernel.org/stable/c/54f9d645a5453d0bfece0c465d34aaf072ea99fa · Note
• https://git.kernel.org/stable/c/a0c6ae2ea84528f198bf7fd0117f12fd0cf6d7cc · Note