CVE-2026-23318

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> ALSA: usb-audio: Use correct version for UAC3 header validation<br /> <br /> The entry of the validators table for UAC3 AC header descriptor is<br /> defined with the wrong protocol version UAC_VERSION_2, while it should<br /> have been UAC_VERSION_3. This results in the validator never matching<br /> for actual UAC3 devices (protocol == UAC_VERSION_3), causing their<br /> header descriptors to bypass validation entirely. A malicious USB<br /> device presenting a truncated UAC3 header could exploit this to cause<br /> out-of-bounds reads when the driver later accesses unvalidated<br /> descriptor fields.<br /> <br /> The bug was introduced in the same commit as the recently fixed UAC3<br /> feature unit sub-type typo, and appears to be from the same copy-paste<br /> error when the UAC3 section was created from the UAC2 section.