CVE-2026-68202

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

ALSA: seq: close a re-opened queue timer in the destructor

queue_delete() closes the queue timer, then frees it. snd_seq_timer_close()

clears q->timer->timeri. snd_use_lock_sync() then drains borrowers, and

snd_seq_timer_delete() frees q->timer.

A borrower can re-open the timer inside that window. A SET_QUEUE_CLIENT

that took a queueptr() use_lock reference before the queue was unlinked

runs snd_seq_timer_open() after the close. Open refuses re-open only while

timeri is set, and the close just cleared it, so it re-opens timeri.

snd_seq_timer_delete() does not close that instance. Its snd_seq_timer_stop()

is a no-op, because running was cleared first. So it frees q->timer with the

instance still live. The queue is freed next.

The instance stays on the global timer with callback_data pointing at the

freed queue. A non-owner START on the unlocked queue arms it. The next tick

derefs the freed queue in snd_seq_timer_interrupt().

Reachable by an unprivileged user with access to /dev/snd/seq. No CAP and

no queue ownership required.

Close any lingering instance in the destructor. There, ->timeri can no

longer change: the queue is unlinked and all use_lock borrowers have

drained, so no snd_seq_queue_use() can re-open it. Close it before clearing

q->timer. snd_timer_close() waits for any in-flight snd_seq_timer_interrupt()

to finish, and that callback still reads q->timer (via snd_seq_check_queue()),

so q->timer must stay valid until it drains.