CVE-2026-74502 (GCVE-0-2026-74502)

Vulnerability from cvelistv5 – Published: 2026-08-15 12:27 – Updated: 2026-08-17 05:20
VLAI
Title
ALSA: ump: fix double free of out_cvts on rawmidi error
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>
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 33cd7630782df2230529c3e8f1a6d0ae9cd6ab49 , < e84d2e53a05c78a04d1343eeb0f31a79456e79fc (git)
Affected: 33cd7630782df2230529c3e8f1a6d0ae9cd6ab49 , < 3302aaeac4f7ee6b775850db21d5f61064ce70ad (git)
Affected: 33cd7630782df2230529c3e8f1a6d0ae9cd6ab49 , < 032746c2dd9a4ea0774b04ac8a29e2ea628f106e (git)
Affected: 33cd7630782df2230529c3e8f1a6d0ae9cd6ab49 , < c57001f55f97ef856fb6527e376c5c4a056a53a4 (git)
Affected: 33cd7630782df2230529c3e8f1a6d0ae9cd6ab49 , < 70c977815af0d997feb2d0c5d284d55689bf7051 (git)
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Linux Linux Affected: 6.5
Unaffected: 0 , < 6.5 (semver)
Unaffected: 6.6.151 , ≤ 6.6.* (semver)
Unaffected: 6.12.103 , ≤ 6.12.* (semver)
Unaffected: 6.18.44 , ≤ 6.18.* (semver)
Unaffected: 7.1.8 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
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          "programFiles": [
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          "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"
        }
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      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:20:40.831Z",
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        {
          "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",
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    "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"
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      "product_status:known_not_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "ALSA: ump: fix double free of out_cvts on rawmidi error",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-74502.json",
      "version": "1"
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    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-08-21T08:39:53+00:00",
      "cve": "CVE-2026-74502",
      "id": "CVE-2026-74502",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "184",
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      "source": "Red Hat CSAF VEX",
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      "title": "kernel: ALSA: ump: fix double free of out_cvts on rawmidi error",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74502.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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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.
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  • 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.


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