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Vulnerability record · CVE-2026-53242 · published 25 June 2026

CVE-2026-53242: Linux kernel null pointer dereference vulnerability

Linux · Linux Kernel

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.

7.8 CVSS 3.1 High EPSS 0.13% · top 97.9% CWE-476 · NULL pointer dereference
7.8CVSS 3.1 base score
0.13%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
2 Sep 2026Last modified by NVD

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.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/06eca2235a3fd281dddf25b0a97772b25b5bb573
https://git.kernel.org/stable/c/7c71a9522555ff137a9ca36b15d759ca04d84788 Patch
https://git.kernel.org/stable/c/88fe2e3658726cb21ff2dcf9770bf672f9b9d31b Patch
https://git.kernel.org/stable/c/b053fcd8912f06c30f932f5b8ec41c72de474695 Patch
https://git.kernel.org/stable/c/cac5bf3500ee6422cf64e0df0b5daeecfed42917 Patch
https://git.kernel.org/stable/c/cd98837db15f323463b8df07282ac723bd5c3fed Patch
https://git.kernel.org/stable/c/d68b621bb5a48051932f1017a6e1bc9b18f854d0 Patch
https://git.kernel.org/stable/c/d842f26a167e77a36f3ed333b9fa99d36ef99fe6 Patch

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Source: NIST National Vulnerability Database (record CVE-2026-53242), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.