CVE-2025-23134

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinux3923de04c81733b30b8ed667569632272fdfed9a < 15291b561d8cc835a2eea76b394070cf8e072771affected
LinuxLinux3923de04c81733b30b8ed667569632272fdfed9a < 296f7a9e15aab276db11206cbc1e2ae1215d7862affected
LinuxLinux3923de04c81733b30b8ed667569632272fdfed9a < b074f47e55df93832bbbca1b524c501e6fea1c0daffected
LinuxLinux3923de04c81733b30b8ed667569632272fdfed9a < 3424c8f53bc63c87712a7fc22dc13d0cc85fb0d6affected
LinuxLinux6.9affected
LinuxLinux0 < 6.9unaffected
LinuxLinux6.12.23 <= 6.12.*unaffected
LinuxLinux6.13.11 <= 6.13.*unaffected
LinuxLinux6.14.2 <= 6.14.*unaffected
LinuxLinux6.15 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

References