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ALSA: aloop: Fix peer runtime UAF during format-change stop

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: ALSA: aloop: Fix peer runtime UAF during format-change stop loopback_check_format() may stop the capture side when playback starts with parameters that no longer match a running capture stream. Commit 826af7fa62e3 ("ALSA: aloop: Fix racy access at PCM trigger") moved the peer lookup under cable->lock, but the actual snd_pcm_stop() still runs after dropping that lock. A concurrent close can clear the capture entry from cable->streams[] and detach or free its runtime while the playback trigger path still holds a stale peer substream pointer. Keep a per-cable count of in-flight peer stops before dropping cable->lock, and make free_cable() wait for those stops before detaching the runtime. This preserves the existing behavior while making the peer runtime lifetime explicit.

Announced Source revision 1
Original source ↗

CVE-2026-46090

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-46090

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "597603d615d2b19a9e451d8cfac24372856a522d",
        "lessThan": "83bd62fa9620ac98d5d694bde14c50f98c8e7189",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "597603d615d2b19a9e451d8cfac24372856a522d",
        "lessThan": "345c24b2bcf0923dfae1ab41497351c68214ff76",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "597603d615d2b19a9e451d8cfac24372856a522d",
        "lessThan": "3727a3541788412c393eec236ad228d72efe19c7",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "597603d615d2b19a9e451d8cfac24372856a522d",
        "lessThan": "d258cdce50ff3e02392917258e81a0ce9555c327",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "597603d615d2b19a9e451d8cfac24372856a522d",
        "lessThan": "03f52a9c170431e8f10e156b9dc0dae80b3e9198",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "597603d615d2b19a9e451d8cfac24372856a522d",
        "lessThan": "bdd9503c3d222d2735b56c7a8b4422ccf3de6e5c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "597603d615d2b19a9e451d8cfac24372856a522d",
        "lessThan": "5d45e34bf001344e2966dabca1897561bbc9e913",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "597603d615d2b19a9e451d8cfac24372856a522d",
        "lessThan": "e5c33cdc6f402eab8abd36ecf436b22c9d3a8aff",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "sound/drivers/aloop.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2.6.37"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.37",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.259",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.210",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.188",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.157",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.88",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.27",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.0.4",
        "versionType": "semver",
        "lessThanOrEqual": "7.0.*"
      },
      {
        "status": "unaffected",
        "version": "7.1",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "sound/drivers/aloop.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-46090

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#40115 · Revision 1
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Publisher date
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