CVE-2026-53192
Description
In the Linux kernel, the following vulnerability has been resolved: ALSA: timer: Fix UAF at snd_timer_user_params() At releasing a timer object, e.g. when a userspace timer (CONFIG_SND_UTIMER) gets closed and snd_timer_free() is called, it tries to detach the timer instances and release the resources. However, it's still possible that other in-flight tasks are holding the timer instance where the to-be-deleted timer object is associated, and this may lead to racy accesses. Fortunately, most of ioctls dealing with the timer instance list already have the protection with register_mutex, and this also avoids such races. But, SNDRV_TIMER_IOCTL_PARAMS isn't protected, hence the concurrent ioctl may lead to use-after-free. This patch just adds the guard with register_mutex to protect snd_timer_user_params() for covering the code path as a quick workaround. It's no hot-path but rather a rarely issued ioctl, so the performance penalty doesn't matter.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
Debian Mixed 5 releases
| Version | Status | Fixed in |
|---|---|---|
| trixie | Fixed | 6.12.94-1 |
| sid | Fixed | 7.0.13-1 |
| forky | Affected | — |
| bullseye | Affected | — |
| bookworm | Affected | — |
References
- https://git.kernel.org/stable/c/92ad2d7f80cad43b046f093e808e11fe919d304a
- https://git.kernel.org/stable/c/117743d62e1225e208568a3ffc2c07214f1347cb
- https://git.kernel.org/stable/c/b2214914e461d0466548a52dfe4f4ee8ce362276
- https://git.kernel.org/stable/c/e2331730175f74169046d2af8db1b47243df7c7a
- https://git.kernel.org/stable/c/38034d04d4a75bbca01df2b313ced0bcd0fa3242
- https://git.kernel.org/stable/c/3d39da65b5c422c5e5afb7d5651b0698d060a827
- https://git.kernel.org/stable/c/306427adf9b97e29e5958cb9cf3096c6151fc9ff
- https://git.kernel.org/stable/c/053a401b592be424fea9d57c789f66cd5d8cec11
- https://security-tracker.debian.org/tracker/CVE-2026-53192
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.