CVE-2026-90116 ALSA: mtpav: shut down output timer before card teardown
A race condition in the ALSA mtpav driver allows a use-after-free during card teardown, potentially causing a kernel 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-2026-90116?
CVE-2026-90116 is a vulnerability in Linux, published on 17 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: mtpav: shut down output timer before card teardown
snd_mtpav_output_timer() rearms chip->timer while holding chip->spinlock and accesses the card-private mtpav state.
snd_mtpav_free() currently takes the same lock and calls timer_delete() when the timer is active. This only removes a pending timer; it does not wait for a callback that is already running and does not prevent the callback from rearming the timer.
A callback running on another CPU can therefore continue after snd_mtpav_free() releases the lock and access the card-private state while the card is being torn down. It can also rearm the timer after timer_delete() has returned.
Call timer_shutdown_sync() without holding chip->spinlock. This waits for any running callback to finish and prevents further rearming before the card-private mtpav state is released.
Which versions are affected by CVE-2026-90116?
How do I fix CVE-2026-90116?
Apply the vendor's patch.
Is CVE-2026-90116 being exploited?
There is no known exploitation of CVE-2026-90116 in the wild and no public exploit code.
Sources
Also known as AZL-102968, BELL-CVE-2026-90116, DEBIAN-CVE-2026-90116, GHSA-f6xw-5hrw-vj32, UBUNTU-CVE-2026-90116.