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CVE-2026-80716

ALSA: pcm: wake linked drain waiters on unlink

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.265, 5.15.216, 6.1.183, 6.6.151, 6.12.103, and 2 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: total

Summary

In 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.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: total

  3. Record last updated

Affected versions

  • Linux Linux

    From f57f3df03a8e6010e321fa0258d3e054713c3cb7 · fixed in c172e4c53321ee6429955295ea133bc3597a3ca9; From f57f3df03a8e6010e321fa0258d3e054713c3cb7 · fixed in 3035bb784cea3f338934f5042dd3f35225a51b2e; From f57f3df03a8e6010e321fa0258d3e054713c3cb7 · fixed in 1c1b7e8e545ce65e40f65b55c432765e058ea98f; From f57f3df03a8e6010e321fa0258d3e054713c3cb7 · fixed in e8b784a3f4fba3ea9c4d05138ecfa784a069627f; From f57f3df03a8e6010e321fa0258d3e054713c3cb7 · fixed in e8315330e4ec09c0cac625515400e13d0ee22b81; From f57f3df03a8e6010e321fa0258d3e054713c3cb7 · fixed in 2940cc3cf43c72126b74ee6376314c195382023a; From f57f3df03a8e6010e321fa0258d3e054713c3cb7 · fixed in db09bc4ab19ce548a078240d2374792523953500; From f57f3df03a8e6010e321fa0258d3e054713c3cb7 · fixed in f495b6c4c8594122918552c9be2b51eb71647cd9

  • Linux Linux

    5.1

  • KernelLinux

    From 5.1.0 · fixed in 5.10.265; From 5.11.0 · fixed in 5.15.216; From 5.16.0 · fixed in 6.1.183; From 6.2.0 · fixed in 6.6.151; From 6.7.0 · fixed in 6.12.103; From 6.13.0 · fixed in 6.18.44; From 6.19.0 · fixed in 7.1.8

References 8

git.kernel.org