ALSA: aloop: Fix peer runtime UAF during format-change stop

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Summary

CVECVE-2026-46090
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-27 14:17:30 UTC
Updated2026-05-27 14:48:03 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: ALSA: aloop: Fix peer runtime UAF during format-change stop loopback_check_format() may stop the capture side when playback starts with parameters that no longer match a running capture stream. Commit 826af7fa62e3 ("ALSA: aloop: Fix racy access at PCM trigger") moved the peer lookup under cable->lock, but the actual snd_pcm_stop() still runs after dropping that lock. A concurrent close can clear the capture entry from cable->streams[] and detach or free its runtime while the playback trigger path still holds a stale peer substream pointer. Keep a per-cable count of in-flight peer stops before dropping cable->lock, and make free_cable() wait for those stops before detaching the runtime. This preserves the existing behavior while making the peer runtime lifetime explicit.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 597603d615d2b19a9e451d8cfac24372856a522d 03f52a9c170431e8f10e156b9dc0dae80b3e9198 git Not specified
CNA Linux Linux affected 597603d615d2b19a9e451d8cfac24372856a522d bdd9503c3d222d2735b56c7a8b4422ccf3de6e5c git Not specified
CNA Linux Linux affected 597603d615d2b19a9e451d8cfac24372856a522d 5d45e34bf001344e2966dabca1897561bbc9e913 git Not specified
CNA Linux Linux affected 597603d615d2b19a9e451d8cfac24372856a522d e5c33cdc6f402eab8abd36ecf436b22c9d3a8aff git Not specified
CNA Linux Linux affected 2.6.37 Not specified
CNA Linux Linux unaffected 2.6.37 semver Not specified
CNA Linux Linux unaffected 6.12.88 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.27 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.4 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1-rc2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/5d45e34bf001344e2966dabca1897561bbc9e913 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/bdd9503c3d222d2735b56c7a8b4422ccf3de6e5c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/03f52a9c170431e8f10e156b9dc0dae80b3e9198 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e5c33cdc6f402eab8abd36ecf436b22c9d3a8aff 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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