CVE-2026-46157: ALSA: pcm: oss: Fix data race at accessing runtime.oss.trigger
In the Linux kernel, the following vulnerability has been resolved:
ALSA: pcm: oss: Fix data race at accessing runtime.oss.trigger
Currently the runtime.oss.trigger field may be accessed concurrently without protection, which may lead to the data race. And, in this case, it may lead to more severe problem because it's a bit field; as writing the data, it may overwrite other bit fields as well, which confuses the operation completely, as spotted by fuzzing.
Fix it by covering runtime.oss.trigger bit fled also with the existing paramslock mutex in both sndpcmossgettrigger() and sndpcmosspoll().
Affected Software
Event History
Frequently Asked Questions
Who can realistically exploit this issue?
Exploitation requires local access to the affected Linux system and only low privileges. No user interaction is required, and the attack complexity is rated low.
What level of impact could successful exploitation have?
The vulnerability is rated high severity with high potential impact to confidentiality, integrity, and availability. The race can corrupt adjacent bit fields and confuse PCM OSS operation.
Is a fix available?
Yes. The issue is described as resolved, with fixes referenced in three Linux stable kernel commits.