CVE-2026-97930 ALSA: usbusx2y: fix in04_last array size mismatch with in04_buf
A buffer over-read in the ALSA usbusx2y driver allows local attackers to read out-of-bounds memory or cause a system crash.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-97930?
CVE-2026-97930 is a memory corruption vulnerability in Linux, published on 25 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
ALSA: usbusx2y: fix in04_last array size mismatch with in04_buf
The in04_last array in struct usx2ydev is declared as char[24], but in04_buf is allocated as sizeof(struct us428_ctls) which is 21 bytes. In i_usx2y_in04_int(), when ctl_snapshot_last == -2 (initialization path):
memcpy(usx2y->in04_last, usx2y->in04_buf, sizeof(usx2y->in04_last));
This copies 24 bytes from a 21-byte slab allocation, reading 3 bytes past the end of the source object.
Introduce a USX2Y_IN04_SIZE constant defined as sizeof(struct us428_ctls) and use it consistently for the in04_last array, the in04_buf allocation, the URB transfer length, and the comparison loop, replacing the bare 24 and 21 literals throughout.
Which versions are affected by CVE-2026-97930?
How do I fix CVE-2026-97930?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-97930 being exploited?
There is no known exploitation of CVE-2026-97930 in the wild and no public exploit code.
Sources
Also known as AZL-104204, BELL-CVE-2026-97930, DEBIAN-CVE-2026-97930, GHSA-2x7p-4659-c97x, UBUNTU-CVE-2026-97930.