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)(®ister_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.
Metrics
CVSS 3.1 5.5/10
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= 3923de04c81733b30b8ed667569632272fdfed9a, < 15291b561d8cc835a2eea76b394070cf8e072771; >= 3923de04c81733b30b8ed667569632272fdfed9a, < 296f7a9e15aab276db11206cbc1e2ae1215d7862; >= 3923de04c81733b30b8ed667569632272fdfed9a, < b074f47e55df93832bbbca1b524c501e6fea1c0d; >= 3923de04c81733b30b8ed667569632272fdfed9a, < 3424c8f53bc63c87712a7fc22dc13d0cc85fb0d6 |
| Linux | Linux | 6.9 |
References
- https://git.kernel.org/stable/c/15291b561d8cc835a2eea76b394070cf8e072771Patch
- https://git.kernel.org/stable/c/296f7a9e15aab276db11206cbc1e2ae1215d7862Patch
- https://git.kernel.org/stable/c/3424c8f53bc63c87712a7fc22dc13d0cc85fb0d6Patch
- https://git.kernel.org/stable/c/b074f47e55df93832bbbca1b524c501e6fea1c0dPatch
Timeline
- Published
- Apr 16, 2025
- Last modified
- Jun 17, 2026
- NVD status
- Modified