CVE-2026-23318

Summary

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.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/82a7d0a1b88798de1a609130080ce0c65dd869e9
• https://git.kernel.org/stable/c/8307d93e63d5f54ef10412d4db2dd551e920dee4
• https://git.kernel.org/stable/c/0dcd1ed96c03459cf14706885c9dd3c1fd8bd29f
• https://git.kernel.org/stable/c/a0c6ae2ea84528f198bf7fd0117f12fd0cf6d7cc
• https://git.kernel.org/stable/c/d3904ca40515272681ae61ad6f561c24f190957f
• https://git.kernel.org/stable/c/1e5753ff4c2e86aa88516f97a224c90a3d0b133e
• https://git.kernel.org/stable/c/499ffd15b00dc91ac95c28f76959dfb5cdcc84d5
• https://git.kernel.org/stable/c/54f9d645a5453d0bfece0c465d34aaf072ea99fa

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