ALSA: timer: Forcibly close timer instances at closing

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Summary

CVECVE-2026-53193
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-25 09:16:36 UTC
Updated2026-06-25 09:16:36 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: ALSA: timer: Forcibly close timer instances at closing When snd_timer object is freed via snd_timer_free() and still pending snd_timer_instance objects are assigned to the timer object, it tries to unlink all instances and just set NULL to each ti->timer, then releases the resources immediately. The problem is, however, when there are slave timer instances that are associated with a master instance linked to this timer: namely, those slave instances still point to the freed timer object although the master instance is unlinked, which may lead to user-after-free. The bug can be easily triggered particularly when a new userspace-driven timers (CONFIG_SND_UTIMER) is involved, since it can create and delete the timer object via a simple file open/close, while the other applications may keep accessing to that timer. This patch is an attempt to paper over the problem above: now instead of just unlinking, call snd_timer_close[_locked]() forcibly for each pending timer instance, so that all assigned slave timer instances are properly detached, too. Since snd_timer_close() might be called later by the driver that created that instance, the check of SNDRV_TIMER_IFLG_DEAD is added at the beginning, too.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 37745918e0e7575bc40f38da93a99b9fa6406224 586b219a22b1032b28b8bd356b963276c5e5bf53 git Not specified
CNA Linux Linux affected 37745918e0e7575bc40f38da93a99b9fa6406224 f46093dd22969037beb1fce2e043f3236be41c92 git Not specified
CNA Linux Linux affected 37745918e0e7575bc40f38da93a99b9fa6406224 60e73ab87b84bbd6bd7ddd1d16019a3a3705ab8f git Not specified
CNA Linux Linux affected 37745918e0e7575bc40f38da93a99b9fa6406224 da3039e91d1f835874ed6e9a33ea19ee80c2cb92 git Not specified
CNA Linux Linux affected 6.12 Not specified
CNA Linux Linux unaffected 6.12 semver Not specified
CNA Linux Linux unaffected 6.12.94 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.36 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.13 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/60e73ab87b84bbd6bd7ddd1d16019a3a3705ab8f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f46093dd22969037beb1fce2e043f3236be41c92 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/586b219a22b1032b28b8bd356b963276c5e5bf53 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/da3039e91d1f835874ed6e9a33ea19ee80c2cb92 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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