Vulnerability-Lookup

CVE-2026-80716 (GCVE-0-2026-80716)

Vulnerability from cvelistv5 – Published: 2026-08-28 06:53 – Updated: 2026-08-29 06:22

Title

ALSA: pcm: wake linked drain waiters on unlink

Summary

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

Assigner

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/c172e4c53321ee642…
https://git.kernel.org/stable/c/3035bb784cea3f338…
https://git.kernel.org/stable/c/1c1b7e8e545ce65e4…
https://git.kernel.org/stable/c/e8b784a3f4fba3ea9…
https://git.kernel.org/stable/c/e8315330e4ec09c0c…
https://git.kernel.org/stable/c/2940cc3cf43c72126…
https://git.kernel.org/stable/c/db09bc4ab19ce548a…
https://git.kernel.org/stable/c/f495b6c4c85941229…

Impacted products

2 products

Vendor	Product	Version	CPE status
Linux	Linux	Affected: f57f3df03a8e6010e321fa0258d3e054713c3cb7 , < c172e4c53321ee6429955295ea133bc3597a3ca9 (git) Affected: f57f3df03a8e6010e321fa0258d3e054713c3cb7 , < 3035bb784cea3f338934f5042dd3f35225a51b2e (git) Affected: f57f3df03a8e6010e321fa0258d3e054713c3cb7 , < 1c1b7e8e545ce65e40f65b55c432765e058ea98f (git) Affected: f57f3df03a8e6010e321fa0258d3e054713c3cb7 , < e8b784a3f4fba3ea9c4d05138ecfa784a069627f (git) Affected: f57f3df03a8e6010e321fa0258d3e054713c3cb7 , < e8315330e4ec09c0cac625515400e13d0ee22b81 (git) Affected: f57f3df03a8e6010e321fa0258d3e054713c3cb7 , < 2940cc3cf43c72126b74ee6376314c195382023a (git) Affected: f57f3df03a8e6010e321fa0258d3e054713c3cb7 , < db09bc4ab19ce548a078240d2374792523953500 (git) Affected: f57f3df03a8e6010e321fa0258d3e054713c3cb7 , < f495b6c4c8594122918552c9be2b51eb71647cd9 (git)	guessed
Linux	Linux	Affected: 5.1 Unaffected: 0 , < 5.1 (semver) Unaffected: 5.10.265 , ≤ 5.10.* (semver) Unaffected: 5.15.216 , ≤ 5.15.* (semver) Unaffected: 6.1.183 , ≤ 6.1.* (semver) Unaffected: 6.6.151 , ≤ 6.6.* (semver) Unaffected: 6.12.103 , ≤ 6.12.* (semver) Unaffected: 6.18.44 , ≤ 6.18.* (semver) Unaffected: 7.1.8 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)	guessed

Show details on NVD website

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          "value": "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."
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              "lang": "en",
              "value": "AV:L - The bug is triggered only via local ALSA PCM character devices (/dev/snd/pcmC*D*) through open/ioctl syscalls (SNDRV_PCM_IOCTL_LINK, UNLINK, DRAIN); snd_pcm_kernel_ioctl does not expose LINK/UNLINK, and there is no network-facing path to this code.\nAC:L - This is a race, but the attacker controls both sides by opening two PCM fds, linking them, blocking one thread in DRAIN, and concurrently UNLINKing or closing the peer; sending a signal or waiting for timeout forces the path where finish_wait() is skipped.\nPR:L - Exploitation requires only a local process able to open and ioctl ALSA PCM nodes (typical desktop/mobile users via the audio group, session ACLs, or equivalent device permissions); no real root, CAP_SYS_ADMIN, or init-namespace privileges are needed.\nUI:N - The attacker drives the entire sequence programmatically with their own PCM file descriptors and threads; no victim interaction such as opening a file, mounting a filesystem, or plugging in hardware is required.\nS:U - Impact is confined to kernel memory corruption and privilege escalation within the same security authority; this is not a VM escape, IOMMU/DMA boundary bypass, or other cross-scope violation.\nC:H - The orphaned wait_queue_entry_t remains on the sleep list after snd_pcm_drain() returns, and a later wake_up() dereferences a freed on-stack wait entry (use-after-free), which can expose kernel stack/memory contents under attacker-controlled timing.\nI:H - Corrupting the wait-queue list with a stale stack-backed entry gives kernel memory corruption primitives; wake_up() invokes the entry\u0027s function pointer from freed stack memory, enabling plausible control-flow hijack and arbitrary write via further heap/stack grooming.\nA:H - A subsequent wake_up() on the poisoned sleep queue walks a freed stack frame and can oops or panic the kernel; even without full exploitation, the UAF reliably threatens system availability on multimedia desktops, kiosks, and embedded devices with ALSA access."
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    "datePublished": "2026-08-28T06:53:14.286Z",
    "dateReserved": "2026-08-26T14:34:25.788Z",
    "dateUpdated": "2026-08-29T06:22:32.041Z",
    "state": "PUBLISHED"
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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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"sound/core/pcm_native.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"f57f3df03a8e6010e321fa0258d3e054713c3cb7\",\"lessThan\":\"c172e4c53321ee6429955295ea133bc3597a3ca9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f57f3df03a8e6010e321fa0258d3e054713c3cb7\",\"lessThan\":\"3035bb784cea3f338934f5042dd3f35225a51b2e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f57f3df03a8e6010e321fa0258d3e054713c3cb7\",\"lessThan\":\"1c1b7e8e545ce65e40f65b55c432765e058ea98f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f57f3df03a8e6010e321fa0258d3e054713c3cb7\",\"lessThan\":\"e8b784a3f4fba3ea9c4d05138ecfa784a069627f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f57f3df03a8e6010e321fa0258d3e054713c3cb7\",\"lessThan\":\"e8315330e4ec09c0cac625515400e13d0ee22b81\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f57f3df03a8e6010e321fa0258d3e054713c3cb7\",\"lessThan\":\"2940cc3cf43c72126b74ee6376314c195382023a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f57f3df03a8e6010e321fa0258d3e054713c3cb7\",\"lessThan\":\"db09bc4ab19ce548a078240d2374792523953500\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f57f3df03a8e6010e321fa0258d3e054713c3cb7\",\"lessThan\":\"f495b6c4c8594122918552c9be2b51eb71647cd9\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"sound/core/pcm_native.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.1\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.1\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.265\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.216\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.183\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.151\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.103\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.44\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.8\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1c1b7e8e545ce65e40f65b55c432765e058ea98f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2940cc3cf43c72126b74ee6376314c195382023a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3035bb784cea3f338934f5042dd3f35225a51b2e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c172e4c53321ee6429955295ea133bc3597a3ca9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/db09bc4ab19ce548a078240d2374792523953500\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e8315330e4ec09c0cac625515400e13d0ee22b81\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e8b784a3f4fba3ea9c4d05138ecfa784a069627f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f495b6c4c8594122918552c9be2b51eb71647cd9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}

FKIE_CVE-2026-80716

Vulnerability from fkie_nvd - Published: 2026-08-28 08:16 - Updated: 2026-08-29 07:16

Severity

7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Summary

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/1c1b7e8e545ce65e40f65b55c432765e058ea98f
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/2940cc3cf43c72126b74ee6376314c195382023a
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/3035bb784cea3f338934f5042dd3f35225a51b2e
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/c172e4c53321ee6429955295ea133bc3597a3ca9
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/db09bc4ab19ce548a078240d2374792523953500
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/e8315330e4ec09c0cac625515400e13d0ee22b81
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/e8b784a3f4fba3ea9c4d05138ecfa784a069627f
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/f495b6c4c8594122918552c9be2b51eb71647cd9

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "sound/core/pcm_native.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "c172e4c53321ee6429955295ea133bc3597a3ca9",
              "status": "affected",
              "version": "f57f3df03a8e6010e321fa0258d3e054713c3cb7",
              "versionType": "git"
            },
            {
              "lessThan": "3035bb784cea3f338934f5042dd3f35225a51b2e",
              "status": "affected",
              "version": "f57f3df03a8e6010e321fa0258d3e054713c3cb7",
              "versionType": "git"
            },
            {
              "lessThan": "1c1b7e8e545ce65e40f65b55c432765e058ea98f",
              "status": "affected",
              "version": "f57f3df03a8e6010e321fa0258d3e054713c3cb7",
              "versionType": "git"
            },
            {
              "lessThan": "e8b784a3f4fba3ea9c4d05138ecfa784a069627f",
              "status": "affected",
              "version": "f57f3df03a8e6010e321fa0258d3e054713c3cb7",
              "versionType": "git"
            },
            {
              "lessThan": "e8315330e4ec09c0cac625515400e13d0ee22b81",
              "status": "affected",
              "version": "f57f3df03a8e6010e321fa0258d3e054713c3cb7",
              "versionType": "git"
            },
            {
              "lessThan": "2940cc3cf43c72126b74ee6376314c195382023a",
              "status": "affected",
              "version": "f57f3df03a8e6010e321fa0258d3e054713c3cb7",
              "versionType": "git"
            },
            {
              "lessThan": "db09bc4ab19ce548a078240d2374792523953500",
              "status": "affected",
              "version": "f57f3df03a8e6010e321fa0258d3e054713c3cb7",
              "versionType": "git"
            },
            {
              "lessThan": "f495b6c4c8594122918552c9be2b51eb71647cd9",
              "status": "affected",
              "version": "f57f3df03a8e6010e321fa0258d3e054713c3cb7",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "sound/core/pcm_native.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.1"
            },
            {
              "lessThan": "5.1",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.265",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.216",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.183",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.151",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.103",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.44",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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": "CVE-2026-80716",
  "lastModified": "2026-08-29T07:16:53.027",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-08-28T08:16:57.303",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1c1b7e8e545ce65e40f65b55c432765e058ea98f"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/2940cc3cf43c72126b74ee6376314c195382023a"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/3035bb784cea3f338934f5042dd3f35225a51b2e"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/c172e4c53321ee6429955295ea133bc3597a3ca9"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/db09bc4ab19ce548a078240d2374792523953500"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e8315330e4ec09c0cac625515400e13d0ee22b81"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e8b784a3f4fba3ea9c4d05138ecfa784a069627f"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f495b6c4c8594122918552c9be2b51eb71647cd9"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}

GHSA-J63J-489F-V3Q9

Vulnerability from github – Published: 2026-08-28 09:31 – Updated: 2026-08-28 09:31

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.

Show details on source website

JSON

To clipboard

{
  "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": null
  },
  "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": "2026-08-28T09:31:50Z",
  "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": []
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

CVE-2026-80716 (GCVE-0-2026-80716)

FKIE_CVE-2026-80716

GHSA-J63J-489F-V3Q9

Tags

Sightings

Nomenclature