CVE-2026-74499 (GCVE-0-2026-74499)

Vulnerability from cvelistv5 – Published: 2026-08-15 12:27 – Updated: 2026-08-19 16:38
VLAI
Title
ALSA: usb-audio: fix OOB write in snd_usbmidi_akai_output()
Summary
In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: fix OOB write in snd_usbmidi_akai_output() snd_usbmidi_akai_output() computes its fill-loop bound buf_end = ep->max_transfer - MAX_AKAI_SYSEX_LEN - 1; as a signed int, so a small device-advertised bulk-OUT max_transfer makes buf_end negative. The loop guard then compares the u32 urb->transfer_buffer_length against that negative int: the usual arithmetic conversion turns buf_end into a large unsigned value, so the guard stays true and each iteration keeps appending SysEx framing and payload bytes past the end of the URB transfer buffer, which is only max_transfer bytes long. A USB device that advertises a tiny bulk-OUT endpoint can therefore trigger an attacker-length- and content-controlled heap out-of-bounds write when a process writes to the created /dev/snd/midiC*D* node. Return early when there is no room for even one SysEx, so the loop is never entered with a bound that would wrap. The loop is the last statement of the function, so bailing out is equivalent to it not running. 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: 4434ade8c9334a3ab975d8993de456f06841899e , < 78dfdeb8d2065524ed5928d6470bf3d3244d1009 (git)
Affected: 4434ade8c9334a3ab975d8993de456f06841899e , < 00cc659a42ac4e94ec880fae2c9bf22fce69c2e8 (git)
Affected: 4434ade8c9334a3ab975d8993de456f06841899e , < ce949d66607cfb000b8d8d84f80f35a886e72683 (git)
Affected: 4434ade8c9334a3ab975d8993de456f06841899e , < 29a4c29943631301e85f5e9d10f25741bd78e7ba (git)
Affected: 4434ade8c9334a3ab975d8993de456f06841899e , < 9b22a5c8310b0d55d04f5f0159b913a2fb8b444f (git)
Affected: 4434ade8c9334a3ab975d8993de456f06841899e , < b5305a0d0bb8e90a6fc9f88270d5f6c9b8c40081 (git)
Affected: 4434ade8c9334a3ab975d8993de456f06841899e , < 2b7a0f330dd90dd1a7657cec0db019ee1efa4372 (git)
Affected: 4434ade8c9334a3ab975d8993de456f06841899e , < 0970274613fb463d376211450cab066d34ebfe6a (git)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.35
Unaffected: 0 , < 2.6.35 (semver)
Unaffected: 5.10.265 , ≤ 5.10.* (semver)
Unaffected: 5.15.216 , ≤ 5.15.* (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (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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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: usb-audio: fix OOB write in snd_usbmidi_akai_output()\n\nsnd_usbmidi_akai_output() computes its fill-loop bound\n\n\tbuf_end = ep-\u003emax_transfer - MAX_AKAI_SYSEX_LEN - 1;\n\nas a signed int, so a small device-advertised bulk-OUT max_transfer\nmakes buf_end negative.  The loop guard then compares the u32\nurb-\u003etransfer_buffer_length against that negative int: the usual\narithmetic conversion turns buf_end into a large unsigned value, so the\nguard stays true and each iteration keeps appending SysEx framing and\npayload bytes past the end of the URB transfer buffer, which is only\nmax_transfer bytes long.\n\nA USB device that advertises a tiny bulk-OUT endpoint can therefore\ntrigger an attacker-length- and content-controlled heap out-of-bounds\nwrite when a process writes to the created /dev/snd/midiC*D* node.\n\nReturn early when there is no room for even one SysEx, so the loop is\nnever entered with a bound that would wrap.  The loop is the last\nstatement of the function, so bailing out is equivalent to it not\nrunning.\n\nDiscovered by XBOW, triaged by Baul Lee \u003cbaul.lee@xbow.com\u003e"
        }
      ],
      "providerMetadata": {
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        },
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          "url": "https://git.kernel.org/stable/c/0970274613fb463d376211450cab066d34ebfe6a"
        }
      ],
      "title": "ALSA: usb-audio: fix OOB write in snd_usbmidi_akai_output()",
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    "datePublished": "2026-08-15T12:27:25.728Z",
    "dateReserved": "2026-08-15T05:44:03.907Z",
    "dateUpdated": "2026-08-19T16:38:00.351Z",
    "state": "PUBLISHED"
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The loop guard then compares the u32\\nurb-\u003etransfer_buffer_length against that negative int: the usual\\narithmetic conversion turns buf_end into a large unsigned value, so the\\nguard stays true and each iteration keeps appending SysEx framing and\\npayload bytes past the end of the URB transfer buffer, which is only\\nmax_transfer bytes long.\\n\\nA USB device that advertises a tiny bulk-OUT endpoint can therefore\\ntrigger an attacker-length- and content-controlled heap out-of-bounds\\nwrite when a process writes to the created /dev/snd/midiC*D* node.\\n\\nReturn early when there is no room for even one SysEx, so the loop is\\nnever entered with a bound that would wrap.  The loop is the last\\nstatement of the function, so bailing out is equivalent to it not\\nrunning.\\n\\nDiscovered by XBOW, triaged by Baul Lee \u003cbaul.lee@xbow.com\u003e\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"sound/usb/midi.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4434ade8c9334a3ab975d8993de456f06841899e\",\"lessThan\":\"78dfdeb8d2065524ed5928d6470bf3d3244d1009\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4434ade8c9334a3ab975d8993de456f06841899e\",\"lessThan\":\"00cc659a42ac4e94ec880fae2c9bf22fce69c2e8\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4434ade8c9334a3ab975d8993de456f06841899e\",\"lessThan\":\"ce949d66607cfb000b8d8d84f80f35a886e72683\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4434ade8c9334a3ab975d8993de456f06841899e\",\"lessThan\":\"29a4c29943631301e85f5e9d10f25741bd78e7ba\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4434ade8c9334a3ab975d8993de456f06841899e\",\"lessThan\":\"9b22a5c8310b0d55d04f5f0159b913a2fb8b444f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4434ade8c9334a3ab975d8993de456f06841899e\",\"lessThan\":\"b5305a0d0bb8e90a6fc9f88270d5f6c9b8c40081\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4434ade8c9334a3ab975d8993de456f06841899e\",\"lessThan\":\"2b7a0f330dd90dd1a7657cec0db019ee1efa4372\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4434ade8c9334a3ab975d8993de456f06841899e\",\"lessThan\":\"0970274613fb463d376211450cab066d34ebfe6a\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"sound/usb/midi.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.35\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.35\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.265\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.216\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.183\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.151\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.103\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.44\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.8\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/00cc659a42ac4e94ec880fae2c9bf22fce69c2e8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/0970274613fb463d376211450cab066d34ebfe6a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/29a4c29943631301e85f5e9d10f25741bd78e7ba\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2b7a0f330dd90dd1a7657cec0db019ee1efa4372\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/78dfdeb8d2065524ed5928d6470bf3d3244d1009\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9b22a5c8310b0d55d04f5f0159b913a2fb8b444f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b5305a0d0bb8e90a6fc9f88270d5f6c9b8c40081\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ce949d66607cfb000b8d8d84f80f35a886e72683\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-17T14:55:46+00:00",
      "cve": "CVE-2026-74499",
      "id": "CVE-2026-74499",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "260",
      "product_status:under_investigation": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ALSA: usb-audio: fix OOB write in snd_usbmidi_akai_output()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74499.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-08-18T16:54:09Z",
      "cve": "CVE-2026-74499",
      "id": "CVE-2026-74499",
      "initial_release_date": "2026-08-15T23:51:33Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-74499",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-74499.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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Detection rules are retrieved from Rulezet.