CVE-2026-74502 (GCVE-0-2026-74502)
Vulnerability from cvelistv5
Published
2026-08-15 12:27
Modified
2026-08-17 05:20
Severity ?
Summary
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>
References
Impacted products
Vendor Product Version
Linux Linux Version: 33cd7630782df2230529c3e8f1a6d0ae9cd6ab49
Version: 33cd7630782df2230529c3e8f1a6d0ae9cd6ab49
Version: 33cd7630782df2230529c3e8f1a6d0ae9cd6ab49
Version: 33cd7630782df2230529c3e8f1a6d0ae9cd6ab49
Version: 33cd7630782df2230529c3e8f1a6d0ae9cd6ab49
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{
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          "defaultStatus": "unaffected",
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          "programFiles": [
            "sound/core/ump.c"
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              "status": "unaffected",
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              "versionType": "original_commit_for_fix"
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      "cpeApplicability": [
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              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "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"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:20:40.831Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/e84d2e53a05c78a04d1343eeb0f31a79456e79fc"
        },
        {
          "url": "https://git.kernel.org/stable/c/3302aaeac4f7ee6b775850db21d5f61064ce70ad"
        },
        {
          "url": "https://git.kernel.org/stable/c/032746c2dd9a4ea0774b04ac8a29e2ea628f106e"
        },
        {
          "url": "https://git.kernel.org/stable/c/c57001f55f97ef856fb6527e376c5c4a056a53a4"
        },
        {
          "url": "https://git.kernel.org/stable/c/70c977815af0d997feb2d0c5d284d55689bf7051"
        }
      ],
      "title": "ALSA: ump: fix double free of out_cvts on rawmidi error",
      "x_generator": {
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      }
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74502",
    "datePublished": "2026-08-15T12:27:27.586Z",
    "dateReserved": "2026-08-15T05:44:03.907Z",
    "dateUpdated": "2026-08-17T05:20:40.831Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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