ALSA: usb-audio: fix OOB write in snd_usbmidi_us122l_output()

{
  "id": "8253b8c2b04ef0e4a8f26e63439f331996417094634b836d69a59f756cdc20a2",
  "url": "https://osv.dev/vulnerability/CVE-2026-90033",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "ALSA: usb-audio: fix OOB write in snd_usbmidi_us122l_output()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: fix OOB write in snd_usbmidi_us122l_output() The snd_usbmidi_us122l_output() picks a count of 2 on anything slower than high speed and never relates it to ep->max_transfer. The URB buffer holds exactly max_transfer bytes, so a device declaring a one byte bulk endpoint takes two bytes from snd_rawmidi_transmit(), and the memset that pads the rest computes 1 - 2 in int and wraps to SIZE_MAX. Only 0x800e and 0x800f are pinned to nine bytes. The US-122MKII at 0x0644:0x8021 falls to the default and takes usb_maxpacket(), which the USB core only clamps downward. The akai and novation output ops in this file were given the same guard recently. Do the same here.",
    "evidence": "osv:CVE-2026-90033",
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    "severity": "unknown",
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      "modified": "2026-10-28T02:30:53.181331015Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/1d4add2b832b56f81bb0eab065ec35c610343018",
        "https://git.kernel.org/stable/c/2dae0e3a59e31f78222279d544b98e747cd1fbff",
        "https://git.kernel.org/stable/c/5538daf2a5cc80ac3f3e913c0db045d92d995d40",
        "https://git.kernel.org/stable/c/9392a2c346762ffee8edd1ba8bac50d2e24a2ed7",
        "https://git.kernel.org/stable/c/9d81885d97cba7796d1f8edc88f2499c8296f5b9",
        "https://git.kernel.org/stable/c/a441a8e52148c91c2f2a91f42e3b9bc961a13a4b",
        "https://git.kernel.org/stable/c/de6d252f115be887a701c09a05cdb076f3a590c9",
        "https://git.kernel.org/stable/c/e4637ce34607f1733a34a57294966d26b263e626",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90033.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-90033",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
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    "security_relevant": true,
    "severity_evidence": null
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  "source_id": "core-osv",
  "document_id": 522268,
  "published_at": "2026-09-16T10:33:33.899+00:00"
}