CVE-2026-53193

/// Technical description

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

ALSA: timer: Forcibly close timer instances at closing

When snd_timer object is freed via snd_timer_free() and still pending

snd_timer_instance objects are assigned to the timer object, it tries

to unlink all instances and just set NULL to each ti->timer, then

releases the resources immediately. The problem is, however, when

there are slave timer instances that are associated with a master

instance linked to this timer: namely, those slave instances still

point to the freed timer object although the master instance is

unlinked, which may lead to user-after-free. The bug can be easily

triggered particularly when a new userspace-driven timers

(CONFIG_SND_UTIMER) is involved, since it can create and delete the

timer object via a simple file open/close, while the other

applications may keep accessing to that timer.

This patch is an attempt to paper over the problem above: now instead

of just unlinking, call snd_timer_

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References