{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-80716",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-80716"
  ],
  "published": "2026-08-28T06:53:24Z",
  "summary": "ALSA: pcm: wake linked drain waiters on unlink",
  "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's runtime->sleep, and after schedule_timeout() removes it\nonly if that peer is still found in the caller's 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's 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() -> 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.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
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          "1:6.18.29-1+rpt1": {
            "linux_commit": "66318c5b5cd8145a662303af12ed39ac07eb27cc",
            "upstream_version": "6.18.29",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.44"
          },
          "1:6.18.33-1+rpt1": {
            "linux_commit": "95b85bebbedcaedfa7ca79116ed38b7376fba412",
            "upstream_version": "6.18.33",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.44"
          },
          "1:6.18.34-1+rpt1": {
            "linux_commit": "c8c7494100e99ee05b11aaa4f0588a223a63d1af",
            "upstream_version": "6.18.34",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.44"
          },
          "1:6.18.39-1+rpt1": {
            "linux_commit": "60ea684a8ace97bb0db1a16e20753bdd6ab371ff",
            "upstream_version": "6.18.39",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.44"
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-80716"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c172e4c53321ee6429955295ea133bc3597a3ca9"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3035bb784cea3f338934f5042dd3f35225a51b2e"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1c1b7e8e545ce65e40f65b55c432765e058ea98f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e8b784a3f4fba3ea9c4d05138ecfa784a069627f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e8315330e4ec09c0cac625515400e13d0ee22b81"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/2940cc3cf43c72126b74ee6376314c195382023a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/db09bc4ab19ce548a078240d2374792523953500"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f495b6c4c8594122918552c9be2b51eb71647cd9"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-29T06:25:05Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "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's 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."
    }
  }
}