Bug 2482522 (CVE-2026-46157)

Summary: CVE-2026-46157 kernel: ALSA: pcm: oss: Fix data race at accessing runtime.oss.trigger
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's Advanced Linux Sound Architecture (ALSA) Pulse Code Modulation (PCM) Open Sound System (OSS) subsystem. A data race vulnerability exists due to concurrent access to the `runtime.oss.trigger` field without proper protection. This unprotected access can lead to the overwriting of other bit fields, which may confuse the system's operation and potentially lead to integrity issues or denial of service.
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Description OSIDB Bzimport 2026-05-28 11:01:28 UTC 
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
params_lock mutex in both snd_pcm_oss_get_trigger() and
snd_pcm_oss_poll().
Comment 1 Keith Grant 2026-05-28 15:54:02 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026052823-CVE-2026-46157-e578@gregkh/T