VYPR
Unrated severityNVD Advisory· Published Apr 16, 2025· Updated Oct 1, 2025

ALSA: timer: Don't take register_mutex with copy_from/to_user()

CVE-2025-23134

Description

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

ALSA: timer: Don't take register_mutex with copy_from/to_user()

The infamous mmap_lock taken in copy_from/to_user() can be often problematic when it's called inside another mutex, as they might lead to deadlocks.

In the case of ALSA timer code, the bad pattern is with guard(mutex)(&register_mutex) that covers copy_from/to_user() -- which was mistakenly introduced at converting to guard(), and it had been carefully worked around in the past.

This patch fixes those pieces simply by moving copy_from/to_user() out of the register mutex lock again.

Affected products

24

Patches

0

No patches discovered yet.

Vulnerability mechanics

AI mechanics synthesis has not run for this CVE yet.

References

4

News mentions

0

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