CVE-2026-74499

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The loop guard then compares the u32\nurb->transfer_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 <baul.lee@xbow.com>"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["sound/usb/midi.c"], "versions": [{"version": "4434ade8c9334a3ab975d8993de456f06841899e", "lessThan": "78dfdeb8d2065524ed5928d6470bf3d3244d1009", "status": "affected", "versionType": "git"}, {"version": "4434ade8c9334a3ab975d8993de456f06841899e", "lessThan": "00cc659a42ac4e94ec880fae2c9bf22fce69c2e8", "status": "affected", "versionType": "git"}, {"version": "4434ade8c9334a3ab975d8993de456f06841899e", "lessThan": "ce949d66607cfb000b8d8d84f80f35a886e72683", "status": "affected", "versionType": "git"}, {"version": "4434ade8c9334a3ab975d8993de456f06841899e", "lessThan": "29a4c29943631301e85f5e9d10f25741bd78e7ba", "status": "affected", "versionType": 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"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.35", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/78dfdeb8d2065524ed5928d6470bf3d3244d1009"}, {"url": "https://git.kernel.org/stable/c/00cc659a42ac4e94ec880fae2c9bf22fce69c2e8"}, {"url": "https://git.kernel.org/stable/c/ce949d66607cfb000b8d8d84f80f35a886e72683"}, {"url": "https://git.kernel.org/stable/c/29a4c29943631301e85f5e9d10f25741bd78e7ba"}, {"url": "https://git.kernel.org/stable/c/9b22a5c8310b0d55d04f5f0159b913a2fb8b444f"}, {"url": "https://git.kernel.org/stable/c/b5305a0d0bb8e90a6fc9f88270d5f6c9b8c40081"}, {"url": "https://git.kernel.org/stable/c/2b7a0f330dd90dd1a7657cec0db019ee1efa4372"}, {"url": "https://git.kernel.org/stable/c/0970274613fb463d376211450cab066d34ebfe6a"}], "title": "ALSA: usb-audio: fix OOB write in snd_usbmidi_akai_output()", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-74499", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-11-06T16:58:49.686471Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-11-06T17:05:47.592Z"}}]}}

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The loop guard then compares the u32\nurb->transfer_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 <baul.lee@xbow.com>"}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.265", "versionStartIncluding": "2.6.35"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.216", "versionStartIncluding": "2.6.35"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.183", "versionStartIncluding": "2.6.35"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.151", "versionStartIncluding": "2.6.35"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.103", "versionStartIncluding": "2.6.35"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.44", "versionStartIncluding": "2.6.35"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1.8", "versionStartIncluding": "2.6.35"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.2", "versionStartIncluding": "2.6.35"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-19T16:38:00.351Z"}}}, "cveMetadata": {"cveId": "CVE-2026-74499", "state": "PUBLISHED", "dateUpdated": "2026-11-06T17:05:47.592Z", "dateReserved": "2026-08-15T05:44:03.907Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-08-15T12:27:25.728Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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The loop guard then compares the u32\nurb->transfer_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 <baul.lee@xbow.com>"}], "id": "CVE-2026-74499", "lastModified": "2026-11-06T17:19:49.930", "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-74499", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-06T16:58:49.686471Z", "version": "2.0.3"}}]}, "published": "2026-08-15T13:17:54.863", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "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"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: ALSA: usb-audio: fix OOB write in snd_usbmidi_akai_output()", "id": "2517087", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2517087"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-787", "details": ["A flaw was found in the kernel's Advanced Linux Sound Architecture (ALSA) USB audio driver. An integer overflow vulnerability in the `snd_usbmidi_akai_output()` function, when processing data from a USB device with a small bulk-OUT endpoint, can lead to an out-of-bounds write in the kernel heap. A local attacker, by writing to a MIDI device node with a specially crafted USB device, could exploit this to achieve arbitrary code execution or cause a denial of service."], "name": "CVE-2026-74499", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Under investigation", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-15T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-74499\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-74499\nhttps://lore.kernel.org/linux-cve-announce/2026081540-CVE-2026-74499-f8f3@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4434ade8c9334a3ab975d8993de456f06841899e,29a4c29943631301e85f5e9d10f25741bd78e7ba)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4434ade8c9334a3ab975d8993de456f06841899e,9b22a5c8310b0d55d04f5f0159b913a2fb8b444f)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4434ade8c9334a3ab975d8993de456f06841899e,b5305a0d0bb8e90a6fc9f88270d5f6c9b8c40081)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4434ade8c9334a3ab975d8993de456f06841899e,2b7a0f330dd90dd1a7657cec0db019ee1efa4372)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4434ade8c9334a3ab975d8993de456f06841899e,0970274613fb463d376211450cab066d34ebfe6a)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "2.6.35"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,2.6.35)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.151,7.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.103,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.44,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.8,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2-rc6,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-08-15T15:15:03.213653+00:00", "updated": "2026-08-18T02:45:03.556732+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}