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CVE PROGRAM SOURCE RECORD7.8 High

CVE-2026-53242

ALSA: PCM: Fix wait queue list corruption in snd_pcm_drain() on linked streams

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Status
Published
Published
Updated
Assigning organization
Linux

Description

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 9baee36e8c5443411c4629afabafaff8a46a23fd to < cac5bf3500ee6422cf64e0df0b5daeecfed42917affected
  • f2cb2e0d27fb925c73a78f0ce7d6dbf68d3747c1 to < 06eca2235a3fd281dddf25b0a97772b25b5bb573affected
  • fc71f888994569f87d5bee20b1ac6c9c1e3a7a79 to < d842f26a167e77a36f3ed333b9fa99d36ef99fe6affected
  • 629cf09464cf98670996ea5c191dc9743e6f3f00 to < d68b621bb5a48051932f1017a6e1bc9b18f854d0affected
  • ae8f8d30d334bad5b1b3cdb1eb8a0b771f55e432 to < b053fcd8912f06c30f932f5b8ec41c72de474695affected
  • 4a758e9a1f5ed722f83c4dd35f867fe811553bcb to < cd98837db15f323463b8df07282ac723bd5c3fedaffected
  • 9b1dbd69ba6f8f8c69bc7b77c2ce3b9c6ed05ba6 to < 7c71a9522555ff137a9ca36b15d759ca04d84788affected
  • 9b1dbd69ba6f8f8c69bc7b77c2ce3b9c6ed05ba6 to < 88fe2e3658726cb21ff2dcf9770bf672f9b9d31baffected
  • c2f64e05a0587a83ec42dbd6b7a7ded79b2ff694affected
  • 5.10.253 to < 5.10.259affected
  • 6.1.167 to < 6.1.176affected
  • 6.6.130 to < 6.6.143affected
  • 6.12.78 to < 6.12.94affected
  • 6.18.19 to < 6.18.36affected
  • 6.19.9 to < 6.20affected

Linux Linux

Default version status: affected

  • 7.0affected
  • 0 to < 7.0unaffected
  • 5.10.259 to ≤ 5.10.*unaffected
  • 6.1.176 to ≤ 6.1.*unaffected
  • 6.6.143 to ≤ 6.6.*unaffected
  • 6.12.94 to ≤ 6.12.*unaffected
  • 6.18.36 to ≤ 6.18.*unaffected
  • 7.0.13 to ≤ 7.0.*unaffected
  • 7.1 to ≤ *unaffected

References