Kernel: ALSA PCM Wait Queue Corruption in snd_pcm_drain (CVE-2026-53242)
CVE-2026-53242 Published on June 25, 2026
ALSA: PCM: Fix wait queue list corruption in snd_pcm_drain() on linked streams
In the Linux kernel, the following vulnerability has been resolved:
ALSA: PCM: Fix wait queue list corruption in snd_pcm_drain() on linked streams
snd_pcm_drain() uses init_waitqueue_entry which does not clear
entry.prev/next, and add_wait_queue with a conditional
remove_wait_queue that is skipped when to_check is no longer
in the group after concurrent UNLINK. The orphaned wait entry
remains on the unlinked substream sleep queue. On the next
drain iteration, add_wait_queue adds the entry to a new queue
while still linked on the old one, corrupting both lists. A
subsequent wake_up dereferences NULL at the func pointer
(mapped from the spinlock at offset 0 of the misinterpreted
wait_queue_head_t), causing a kernel panic.
Replace init_waitqueue_entry/add_wait_queue/conditional
remove_wait_queue with init_wait_entry/prepare_to_wait/
finish_wait. init_wait_entry clears prev/next via
INIT_LIST_HEAD on each iteration and sets
autoremove_wake_function which auto-removes the entry on
wake-up. finish_wait safely handles both the already-removed
and still-queued cases.
Products Associated with CVE-2026-53242
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Affected Versions
Linux:- Version 9baee36e8c5443411c4629afabafaff8a46a23fd and below cac5bf3500ee6422cf64e0df0b5daeecfed42917 is affected.
- Version fc71f888994569f87d5bee20b1ac6c9c1e3a7a79 and below d842f26a167e77a36f3ed333b9fa99d36ef99fe6 is affected.
- Version 629cf09464cf98670996ea5c191dc9743e6f3f00 and below d68b621bb5a48051932f1017a6e1bc9b18f854d0 is affected.
- Version ae8f8d30d334bad5b1b3cdb1eb8a0b771f55e432 and below b053fcd8912f06c30f932f5b8ec41c72de474695 is affected.
- Version 4a758e9a1f5ed722f83c4dd35f867fe811553bcb and below cd98837db15f323463b8df07282ac723bd5c3fed is affected.
- Version 9b1dbd69ba6f8f8c69bc7b77c2ce3b9c6ed05ba6 and below 7c71a9522555ff137a9ca36b15d759ca04d84788 is affected.
- Version 9b1dbd69ba6f8f8c69bc7b77c2ce3b9c6ed05ba6 and below 88fe2e3658726cb21ff2dcf9770bf672f9b9d31b is affected.
- Version c2f64e05a0587a83ec42dbd6b7a7ded79b2ff694 is affected.
- Version 5.10.253 and below 5.10.259 is affected.
- Version 6.1.167 and below 6.1.176 is affected.
- Version 6.6.130 and below 6.6.143 is affected.
- Version 6.12.78 and below 6.12.94 is affected.
- Version 6.18.19 and below 6.18.36 is affected.
- Version 6.19.9 and below 6.20 is affected.
- Version 7.0 is affected.
- Before 7.0 is unaffected.
- Version 5.10.259, <= 5.10.* is unaffected.
- Version 6.1.176, <= 6.1.* is unaffected.
- Version 6.6.143, <= 6.6.* is unaffected.
- Version 6.12.94, <= 6.12.* is unaffected.
- Version 6.18.36, <= 6.18.* is unaffected.
- Version 7.0.13, <= 7.0.* is unaffected.
- Version 7.1, <= * is unaffected.