GHSA-2P59-XC6P-6W7C
Vulnerability from github – Published: 2026-06-25 09:31 – Updated: 2026-09-02 15:34In 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": [],
"aliases": [
"CVE-2026-53242"
],
"database_specific": {
"cwe_ids": [
"CWE-476"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-06-25T09:16:42Z",
"severity": "HIGH"
},
"details": "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.",
"id": "GHSA-2p59-xc6p-6w7c",
"modified": "2026-09-02T15:34:19Z",
"published": "2026-06-25T09:31:22Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53242"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/06eca2235a3fd281dddf25b0a97772b25b5bb573"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/7c71a9522555ff137a9ca36b15d759ca04d84788"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/88fe2e3658726cb21ff2dcf9770bf672f9b9d31b"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/b053fcd8912f06c30f932f5b8ec41c72de474695"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/cac5bf3500ee6422cf64e0df0b5daeecfed42917"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/cd98837db15f323463b8df07282ac723bd5c3fed"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d68b621bb5a48051932f1017a6e1bc9b18f854d0"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d842f26a167e77a36f3ed333b9fa99d36ef99fe6"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
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