ALSA: pcm: wake linked drain waiters on unlink

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-80716
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-28 08:16:57 UTC
Updated2026-08-28 08:16:57 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: ALSA: pcm: wake linked drain waiters on unlink snd_pcm_drain() on a linked stream parks an on-stack wait entry on the drained peer's runtime->sleep, and after schedule_timeout() removes it only if that peer is still found in the caller's group. If group membership changes during the wait and the sleep ends by signal or timeout (so autoremove_wake_function() does not run), finish_wait() is skipped and snd_pcm_drain() returns with the entry still queued on that stream's sleep list; a later wake_up() then walks a freed stack frame. This is reachable by unlinking either the drained or the draining stream. Unlike the close path (snd_pcm_drop() -> snd_pcm_post_stop()), snd_pcm_unlink() never wakes the sleep queues. Wake every group member under the group lock before the membership change, so a linked drainer is released and drops its entry while the streams are still grouped. The window was opened when snd_pcm_link_rwsem stopped being held across the wait and the removal became conditional on group membership (see Fixes). The later switch to finish_wait() kept that conditional removal, so the signal/timeout case remained.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected f57f3df03a8e6010e321fa0258d3e054713c3cb7 c172e4c53321ee6429955295ea133bc3597a3ca9 git Not specified
CNA Linux Linux affected f57f3df03a8e6010e321fa0258d3e054713c3cb7 3035bb784cea3f338934f5042dd3f35225a51b2e git Not specified
CNA Linux Linux affected f57f3df03a8e6010e321fa0258d3e054713c3cb7 1c1b7e8e545ce65e40f65b55c432765e058ea98f git Not specified
CNA Linux Linux affected f57f3df03a8e6010e321fa0258d3e054713c3cb7 e8b784a3f4fba3ea9c4d05138ecfa784a069627f git Not specified
CNA Linux Linux affected f57f3df03a8e6010e321fa0258d3e054713c3cb7 e8315330e4ec09c0cac625515400e13d0ee22b81 git Not specified
CNA Linux Linux affected f57f3df03a8e6010e321fa0258d3e054713c3cb7 2940cc3cf43c72126b74ee6376314c195382023a git Not specified
CNA Linux Linux affected f57f3df03a8e6010e321fa0258d3e054713c3cb7 db09bc4ab19ce548a078240d2374792523953500 git Not specified
CNA Linux Linux affected f57f3df03a8e6010e321fa0258d3e054713c3cb7 f495b6c4c8594122918552c9be2b51eb71647cd9 git Not specified
CNA Linux Linux affected 5.1 Not specified
CNA Linux Linux unaffected 5.1 semver Not specified
CNA Linux Linux unaffected 5.10.265 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.216 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.183 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.151 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.103 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.44 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.8 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/c172e4c53321ee6429955295ea133bc3597a3ca9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e8b784a3f4fba3ea9c4d05138ecfa784a069627f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1c1b7e8e545ce65e40f65b55c432765e058ea98f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e8315330e4ec09c0cac625515400e13d0ee22b81 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3035bb784cea3f338934f5042dd3f35225a51b2e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/db09bc4ab19ce548a078240d2374792523953500 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2940cc3cf43c72126b74ee6376314c195382023a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f495b6c4c8594122918552c9be2b51eb71647cd9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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