GHSA-J63J-489F-V3Q9

Vulnerability from github – Published: 2026-08-28 09:31 – Updated: 2026-08-29 09:30
VLAI
Details

In the Linux kernel, the following vulnerability has been resolved:

ALSA: pcm: wake linked drain waiters on unlink

snd_pcm_drain() on a linked stream parks an on-stack wait entry on the drained peer's runtime->sleep, and after schedule_timeout() removes it only if that peer is still found in the caller's group. If group membership changes during the wait and the sleep ends by signal or timeout (so autoremove_wake_function() does not run), finish_wait() is skipped and snd_pcm_drain() returns with the entry still queued on that stream's sleep list; a later wake_up() then walks a freed stack frame. This is reachable by unlinking either the drained or the draining stream.

Unlike the close path (snd_pcm_drop() -> snd_pcm_post_stop()), snd_pcm_unlink() never wakes the sleep queues. Wake every group member under the group lock before the membership change, so a linked drainer is released and drops its entry while the streams are still grouped.

The window was opened when snd_pcm_link_rwsem stopped being held across the wait and the removal became conditional on group membership (see Fixes). The later switch to finish_wait() kept that conditional removal, so the signal/timeout case remained.

Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2026-80716"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-28T08:16:57Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: pcm: wake linked drain waiters on unlink\n\nsnd_pcm_drain() on a linked stream parks an on-stack wait entry on the\ndrained peer\u0027s runtime-\u003esleep, and after schedule_timeout() removes it\nonly if that peer is still found in the caller\u0027s group.  If group\nmembership changes during the wait and the sleep ends by signal or\ntimeout (so autoremove_wake_function() does not run), finish_wait() is\nskipped and snd_pcm_drain() returns with the entry still queued on that\nstream\u0027s sleep list; a later wake_up() then walks a freed stack frame.\nThis is reachable by unlinking either the drained or the draining stream.\n\nUnlike the close path (snd_pcm_drop() -\u003e snd_pcm_post_stop()),\nsnd_pcm_unlink() never wakes the sleep queues.  Wake every group member\nunder the group lock before the membership change, so a linked drainer is\nreleased and drops its entry while the streams are still grouped.\n\nThe window was opened when snd_pcm_link_rwsem stopped being held across\nthe wait and the removal became conditional on group membership (see\nFixes). The later switch to finish_wait() kept that conditional removal,\nso the signal/timeout case remained.",
  "id": "GHSA-j63j-489f-v3q9",
  "modified": "2026-08-29T09:30:29Z",
  "published": "2026-08-28T09:31:50Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80716"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1c1b7e8e545ce65e40f65b55c432765e058ea98f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2940cc3cf43c72126b74ee6376314c195382023a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3035bb784cea3f338934f5042dd3f35225a51b2e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c172e4c53321ee6429955295ea133bc3597a3ca9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/db09bc4ab19ce548a078240d2374792523953500"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e8315330e4ec09c0cac625515400e13d0ee22b81"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e8b784a3f4fba3ea9c4d05138ecfa784a069627f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f495b6c4c8594122918552c9be2b51eb71647cd9"
    }
  ],
  "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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