High [CVE-2026-74503] Clear SNDRV_TIMER_IFLG_DEAD once the close completes
This high-severity Red Hat Linux advisory covers CVE-2026-74503 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat package: kernel-rt.
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Summary
A flaw was found in the Linux kernel's Advanced Linux Sound Architecture (ALSA) timer component. An unprivileged local user with access to the /dev/snd/timer and /dev/snd/seq devices can exploit a race condition where a timer instance's SNDRV_TIMER_IFLG_DEAD flag is not properly cleared after closing.
This can lead to a use-after-free vulnerability, allowing the user to trigger a system crash and cause a denial of service. Red Hat severity: Important — CVSS 7 (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H).
Weakness: CWE-825. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 9.
Red Hat does not currently list a fixing RHSA for this CVE.
Affected products named by the advisory: Red Hat package: kernel-rt.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · medium-confidence parse· fetched 1 hour ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · medium-confidence parse· fetched 1 hour ago·verify at source
Mitigation
The source record does not include mitigation steps. That is not a statement that no fix exists — read the vendor advisory below for the authoritative guidance.
Official advisory · medium-confidence parse· fetched 1 hour ago·verify at source
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