CVE-2026-53242 (GCVE-0-2026-53242)

Vulnerability from cvelistv5 – Published: 2026-06-25 08:39 – Updated: 2026-06-28 06:40
VLAI
Title
ALSA: PCM: Fix wait queue list corruption in snd_pcm_drain() on linked streams
Summary
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.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 9baee36e8c5443411c4629afabafaff8a46a23fd , < cac5bf3500ee6422cf64e0df0b5daeecfed42917 (git)
Affected: fc71f888994569f87d5bee20b1ac6c9c1e3a7a79 , < d842f26a167e77a36f3ed333b9fa99d36ef99fe6 (git)
Affected: 629cf09464cf98670996ea5c191dc9743e6f3f00 , < d68b621bb5a48051932f1017a6e1bc9b18f854d0 (git)
Affected: ae8f8d30d334bad5b1b3cdb1eb8a0b771f55e432 , < b053fcd8912f06c30f932f5b8ec41c72de474695 (git)
Affected: 4a758e9a1f5ed722f83c4dd35f867fe811553bcb , < cd98837db15f323463b8df07282ac723bd5c3fed (git)
Affected: 9b1dbd69ba6f8f8c69bc7b77c2ce3b9c6ed05ba6 , < 7c71a9522555ff137a9ca36b15d759ca04d84788 (git)
Affected: 9b1dbd69ba6f8f8c69bc7b77c2ce3b9c6ed05ba6 , < 88fe2e3658726cb21ff2dcf9770bf672f9b9d31b (git)
Affected: c2f64e05a0587a83ec42dbd6b7a7ded79b2ff694 (git)
Affected: 5.10.253 , < 5.10.259 (semver)
Affected: 6.1.167 , < 6.1.176 (semver)
Affected: 6.6.130 , < 6.6.143 (semver)
Affected: 6.12.78 , < 6.12.94 (semver)
Affected: 6.18.19 , < 6.18.36 (semver)
Affected: 6.19.9 , < 6.20 (semver)
Create a notification for this product.
Linux Linux Affected: 7.0
Unaffected: 0 , < 7.0 (semver)
Unaffected: 5.10.259 , ≤ 5.10.* (semver)
Unaffected: 6.1.176 , ≤ 6.1.* (semver)
Unaffected: 6.6.143 , ≤ 6.6.* (semver)
Unaffected: 6.12.94 , ≤ 6.12.* (semver)
Unaffected: 6.18.36 , ≤ 6.18.* (semver)
Unaffected: 7.0.13 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: PCM: Fix wait queue list corruption in snd_pcm_drain() on linked streams\n\nsnd_pcm_drain() uses init_waitqueue_entry which does not clear\nentry.prev/next, and add_wait_queue with a conditional\nremove_wait_queue that is skipped when to_check is no longer\nin the group after concurrent UNLINK.  The orphaned wait entry\nremains on the unlinked substream sleep queue.  On the next\ndrain iteration, add_wait_queue adds the entry to a new queue\nwhile still linked on the old one, corrupting both lists.  A\nsubsequent wake_up dereferences NULL at the func pointer\n(mapped from the spinlock at offset 0 of the misinterpreted\nwait_queue_head_t), causing a kernel panic.\n\nReplace init_waitqueue_entry/add_wait_queue/conditional\nremove_wait_queue with init_wait_entry/prepare_to_wait/\nfinish_wait.  init_wait_entry clears prev/next via\nINIT_LIST_HEAD on each iteration and sets\nautoremove_wake_function which auto-removes the entry on\nwake-up.  finish_wait safely handles both the already-removed\nand still-queued cases."
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A\\nsubsequent wake_up dereferences NULL at the func pointer\\n(mapped from the spinlock at offset 0 of the misinterpreted\\nwait_queue_head_t), causing a kernel panic.\\n\\nReplace init_waitqueue_entry/add_wait_queue/conditional\\nremove_wait_queue with init_wait_entry/prepare_to_wait/\\nfinish_wait.  init_wait_entry clears prev/next via\\nINIT_LIST_HEAD on each iteration and sets\\nautoremove_wake_function which auto-removes the entry on\\nwake-up.  finish_wait safely handles both the already-removed\\nand still-queued 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  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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