{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-46090",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-46090"
  ],
  "published": "2026-05-27T12:59:23Z",
  "summary": "ALSA: aloop: Fix peer runtime UAF during format-change stop",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: aloop: Fix peer runtime UAF during format-change stop\n\nloopback_check_format() may stop the capture side when playback starts\nwith parameters that no longer match a running capture stream. Commit\n826af7fa62e3 (\"ALSA: aloop: Fix racy access at PCM trigger\") moved\nthe peer lookup under cable->lock, but the actual snd_pcm_stop() still\nruns after dropping that lock.\n\nA concurrent close can clear the capture entry from cable->streams[] and\ndetach or free its runtime while the playback trigger path still holds a\nstale peer substream pointer.\n\nKeep a per-cable count of in-flight peer stops before dropping\ncable->lock, and make free_cable() wait for those stops before\ndetaching the runtime. This preserves the existing behavior while\nmaking the peer runtime lifetime explicit.",
  "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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      "url": "https://www.cve.org/CVERecord?id=CVE-2026-46090"
    },
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    "severity": {
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      "scenario": "AV:L - The vulnerable code is reached only through local ALSA PCM device files (/dev/snd/pcmC*D*) via open/ioctl syscalls; there is no remote or network-facing path to the aloop trigger callback.\nAC:L - The attacker controls both sides of the race by opening both loopback substreams and repeatedly triggering playback START while concurrently closing the capture stream; syzbot reproduces it readily, so no condition is outside attacker control.\nPR:L - Exploitation requires only access to /dev/snd PCM nodes, which an unprivileged local user obtains via the audio group or udev session ACLs on systems where snd-aloop is loaded; no real root is needed.\nUI:N - The attacker performs all open/trigger/close operations themselves; no victim action is required.\nS:U - The use-after-free and its impact are confined within the kernel's own security authority; there is no crossing of a VM, IOMMU, or sandbox boundary.\nC:H - The UAF on the freed snd_pcm_runtime heap object lets an attacker reclaim it via heap spraying and read attacker-influenced/adjacent kernel memory, yielding high confidentiality impact.\nI:H - Re-entering snd_pcm_stop()/the trigger op on a freed, attacker-reclaimable object enables a write/control-flow primitive via heap spraying, giving high integrity impact.\nA:H - The use-after-free dereferences freed kernel memory, reliably causing an oops/kernel panic and thus high availability impact."
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}