SB20260828148 - Race condition in Linux kernel seq oss

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-80628)

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to a race condition in snd_seq_oss_readq_clear() in the ALSA OSS sequencer read queue when resetting the queue concurrently with locked queue updates. A local user can trigger queue reset and concurrent read or event handling operations to cause a denial of service.

The race can leave stale records in the queue, drop newly queued records, or report incorrect readiness after wakeup.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/287d506d4e0865918cec82bb1361f283a08c979b
• https://git.kernel.org/stable/c/43e10709b1ba288bcbabb9b9cb6e518b2a5d8506
• https://git.kernel.org/stable/c/49ce92d207820f588b0406add82f053decfbe5d9