CVE-2026-90116ALSA: mtpav: shut down output timer before card teardown

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.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/a9435a1f14a6f9520452617343ea59bb35ba9e79
• https://git.kernel.org/stable/c/793163e134028e7136c9dd9e30f7f656de1eabba
• https://git.kernel.org/stable/c/de75857ce374671712e1d9528844e3c0543dcef6
• https://git.kernel.org/stable/c/392c985c6b03dfdf4904c0d464f18735ca3c4df8
• https://git.kernel.org/stable/c/1e16e82581521a2fe20eda29bdc9e75286f7c950
• https://git.kernel.org/stable/c/c73cb5b7c159246dd572277c668851a56e516019