CVE-2026-93808

In the Linux kernel, the following vulnerability has been resolved:

ALSA: usb-audio: caiaq: validate EP1 reply lengths

usb_ep1_command_reply_dispatch() uses buf[0] as a command byte and then

reads command-specific fixed items from the same URB buffer. Several

paths use buf + 1, buf[1], buf[2], or buf + 3 without first proving that

urb->actual_length contains those bytes.

Add per-command length checks, use a payload length derived from the

bytes after the command byte for the control-state copy, and reject short

analog input payloads before the input helper reads fixed offsets from

the EP1 reply.