GHSA-RPCV-W828-3J36

Vulnerability from github – Published: 2026-08-15 15:30 – Updated: 2026-08-15 15:30
VLAI
Details

In the Linux kernel, the following vulnerability has been resolved:

ALSA: ump: fix double free of out_cvts on rawmidi error

snd_ump_attach_legacy_rawmidi() allocates the legacy conversion array ump->out_cvts and, on the snd_rawmidi_new() error path, frees it with kfree() but leaves ump->out_cvts pointing at the freed memory. When the endpoint is later torn down, snd_ump_endpoint_free() frees ump->out_cvts a second time, resulting in a double free.

The host snd-usb-audio driver attaches the legacy rawmidi for any USB MIDI 2.0 (UMP) device, so a device that makes snd_rawmidi_new() fail reaches this path on enumeration.

Clear ump->out_cvts after freeing it on the error path so it is not freed again during teardown.

Discovered by XBOW, triaged by Baul Lee baul.lee@xbow.com

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{
  "affected": [],
  "aliases": [
    "CVE-2026-74502"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T13:17:55Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: ump: fix double free of out_cvts on rawmidi error\n\nsnd_ump_attach_legacy_rawmidi() allocates the legacy conversion array\nump-\u003eout_cvts and, on the snd_rawmidi_new() error path, frees it with\nkfree() but leaves ump-\u003eout_cvts pointing at the freed memory.  When the\nendpoint is later torn down, snd_ump_endpoint_free() frees ump-\u003eout_cvts\na second time, resulting in a double free.\n\nThe host snd-usb-audio driver attaches the legacy rawmidi for any USB\nMIDI 2.0 (UMP) device, so a device that makes snd_rawmidi_new() fail\nreaches this path on enumeration.\n\nClear ump-\u003eout_cvts after freeing it on the error path so it is not\nfreed again during teardown.\n\nDiscovered by XBOW, triaged by Baul Lee \u003cbaul.lee@xbow.com\u003e",
  "id": "GHSA-rpcv-w828-3j36",
  "modified": "2026-08-15T15:30:34Z",
  "published": "2026-08-15T15:30:34Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74502"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/032746c2dd9a4ea0774b04ac8a29e2ea628f106e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3302aaeac4f7ee6b775850db21d5f61064ce70ad"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/70c977815af0d997feb2d0c5d284d55689bf7051"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c57001f55f97ef856fb6527e376c5c4a056a53a4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e84d2e53a05c78a04d1343eeb0f31a79456e79fc"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}



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