CVE-2026-80812 ALSA: dummy: Check card index validity at probe
A local attacker with high privileges can trigger an out-of-bounds access in the ALSA dummy driver via sysfs, potentially causing a crash or code execution.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-80812?
CVE-2026-80812 is a memory corruption vulnerability in Linux, published on 4 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: dummy: Check card index validity at probe
snd_dummy_probe() blindly trusts that the given devptr->id value is within the proper card index range. It's OK for the devices the driver itself creates at the module probe time, but if the device is bound manually via sysfs interface, this could be -1 as "none", and this leads to OOB access for index[] and other parameters.
Add a sanity check for the card index and warn/correct it if it's a value out of the range.
Which versions are affected by CVE-2026-80812?
How do I fix CVE-2026-80812?
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-2026-80812 being exploited?
There is no known exploitation of CVE-2026-80812 in the wild and no public exploit code.
Sources
Also known as AZL-99675, BELL-CVE-2026-80812, DEBIAN-CVE-2026-80812, GHSA-7cxv-m2m2-8qf9, UBUNTU-CVE-2026-80812.