Vulnerability-Lookup

GHSA-W9FF-9CJH-6463

Vulnerability from github – Published: 2026-05-27 15:33 – Updated: 2026-05-27 15:33

Details

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.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-46090"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-27T14:17:30Z",
    "severity": null
  },
  "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-\u003elock, but the actual snd_pcm_stop() still\nruns after dropping that lock.\n\nA concurrent close can clear the capture entry from cable-\u003estreams[] 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-\u003elock, and make free_cable() wait for those stops before\ndetaching the runtime. This preserves the existing behavior while\nmaking the peer runtime lifetime explicit.",
  "id": "GHSA-w9ff-9cjh-6463",
  "modified": "2026-05-27T15:33:23Z",
  "published": "2026-05-27T15:33:23Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-46090"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/03f52a9c170431e8f10e156b9dc0dae80b3e9198"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5d45e34bf001344e2966dabca1897561bbc9e913"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bdd9503c3d222d2735b56c7a8b4422ccf3de6e5c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e5c33cdc6f402eab8abd36ecf436b22c9d3a8aff"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-46090 (GCVE-0-2026-46090)

Vulnerability from cvelistv5 – Published: 2026-05-27 12:58 – Updated: 2026-05-27 12:58

Title

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

Summary

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.

Severity

No CVSS data available.

Assigner

Linux

References

4 references

URL	Tags
https://git.kernel.org/stable/c/03f52a9c170431e8f…
https://git.kernel.org/stable/c/bdd9503c3d222d273…
https://git.kernel.org/stable/c/5d45e34bf001344e2…
https://git.kernel.org/stable/c/e5c33cdc6f402eab8…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 597603d615d2b19a9e451d8cfac24372856a522d , < 03f52a9c170431e8f10e156b9dc0dae80b3e9198 (git) Affected: 597603d615d2b19a9e451d8cfac24372856a522d , < bdd9503c3d222d2735b56c7a8b4422ccf3de6e5c (git) Affected: 597603d615d2b19a9e451d8cfac24372856a522d , < 5d45e34bf001344e2966dabca1897561bbc9e913 (git) Affected: 597603d615d2b19a9e451d8cfac24372856a522d , < e5c33cdc6f402eab8abd36ecf436b22c9d3a8aff (git)
Linux	Linux	Affected: 2.6.37 Unaffected: 0 , < 2.6.37 (semver) Unaffected: 6.12.88 , ≤ 6.12.* (semver) Unaffected: 6.18.27 , ≤ 6.18.* (semver) Unaffected: 7.0.4 , ≤ 7.0.* (semver) Unaffected: 7.1-rc2 , ≤ * (original_commit_for_fix)

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        {
          "defaultStatus": "unaffected",
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          "programFiles": [
            "sound/drivers/aloop.c"
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          "vendor": "Linux",
          "versions": [
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              "status": "affected",
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              "versionType": "git"
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              "versionType": "git"
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          "versions": [
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              "version": "2.6.37"
            },
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              "lessThan": "2.6.37",
              "status": "unaffected",
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              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
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              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.27",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1-rc2",
              "versionType": "original_commit_for_fix"
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        }
      ],
      "cpeApplicability": [
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          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "2.6.37",
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        "dateUpdated": "2026-05-27T12:58:34.428Z",
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      "title": "ALSA: aloop: Fix peer runtime UAF during format-change stop",
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    "datePublished": "2026-05-27T12:58:34.428Z",
    "dateReserved": "2026-05-13T15:03:33.097Z",
    "dateUpdated": "2026-05-27T12:58:34.428Z",
    "state": "PUBLISHED"
  },
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}

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.

Action not permitted

GHSA-W9FF-9CJH-6463

CVE-2026-46090 (GCVE-0-2026-46090)

Tags

Sightings

Nomenclature