CVE-2026-68201

CVE-2026-68201 · ALSA: timer: drain a slave's callback before its master detaches it

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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.

CVSS 7.8 · Élevée · EPSS 0,2% · Correctif disponible

Publication

2026-08-10T12:00:20.280Z

Mise à jour

2026-10-19T20:58:56.946Z

Pile logicielle: system

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