CVE-2026-68201

Status: UPDATED  |  Advisory ID: CVE-2026-68201

Key Details

Affected Products, Subsystems & Sectors

What to Know

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

ALSA: timer: drain a slave's callback before its master detaches it

snd_timer_close_locked() drains the closing instance's own in-flight

callback (IFLG_CALLBACK) before freeing it, but not its slaves'. When a

master instance is closed, remove_slave_links() clears each slave's

->timer; the slave's own close then reads timer == NULL and takes the

branch that skips the drain entirely (snd_timer_stop_slave() also no-ops

on a NULL timer). So a slave whose callback is still running when the

master is closed is freed underneath the live callback, leading to

use-after-free.

Drain the slaves too before remove_slave_links() severs them.

snd_timer_stop() has already taken this instance off the active list, so

no new slave callback can be queued. Take the slaves off the ack list so

a pending one can't fire either, then wait for any that is already in

flight. (NVD)

What to Do

Monitor Linux's web page for any future patch releases.

References