CVE-2026-90033 (GCVE-0-2026-90033)
Vulnerability from cvelistv5
Published
2026-09-16 10:33
Modified
2026-10-19 08:56
Severity ?
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 030a07e441296c372f946cd4065b5d831d8dc40c
Version: 030a07e441296c372f946cd4065b5d831d8dc40c
Version: 030a07e441296c372f946cd4065b5d831d8dc40c
Version: 030a07e441296c372f946cd4065b5d831d8dc40c
Version: 030a07e441296c372f946cd4065b5d831d8dc40c
Version: 030a07e441296c372f946cd4065b5d831d8dc40c
Version: 030a07e441296c372f946cd4065b5d831d8dc40c
Version: 030a07e441296c372f946cd4065b5d831d8dc40c
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{
  "containers": {
    "cna": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "sound/usb/midi.c"
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              "versionType": "original_commit_for_fix"
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        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              ],
              "negate": false,
              "operator": "OR"
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          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: usb-audio: fix OOB write in snd_usbmidi_us122l_output()\n\nThe snd_usbmidi_us122l_output() picks a count of 2 on anything slower\nthan high speed and never relates it to ep-\u003emax_transfer.  The URB\nbuffer holds exactly max_transfer bytes, so a device declaring a one\nbyte bulk endpoint takes two bytes from snd_rawmidi_transmit(), and the\nmemset that pads the rest computes 1 - 2 in int and wraps to SIZE_MAX.\n\nOnly 0x800e and 0x800f are pinned to nine bytes.  The US-122MKII at\n0x0644:0x8021 falls to the default and takes usb_maxpacket(), which the\nUSB core only clamps downward.\n\nThe akai and novation output ops in this file were given the same guard\nrecently.  Do the same here."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:56:50.205Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/5538daf2a5cc80ac3f3e913c0db045d92d995d40"
        },
        {
          "url": "https://git.kernel.org/stable/c/a441a8e52148c91c2f2a91f42e3b9bc961a13a4b"
        },
        {
          "url": "https://git.kernel.org/stable/c/2dae0e3a59e31f78222279d544b98e747cd1fbff"
        },
        {
          "url": "https://git.kernel.org/stable/c/1d4add2b832b56f81bb0eab065ec35c610343018"
        },
        {
          "url": "https://git.kernel.org/stable/c/de6d252f115be887a701c09a05cdb076f3a590c9"
        },
        {
          "url": "https://git.kernel.org/stable/c/9392a2c346762ffee8edd1ba8bac50d2e24a2ed7"
        },
        {
          "url": "https://git.kernel.org/stable/c/9d81885d97cba7796d1f8edc88f2499c8296f5b9"
        },
        {
          "url": "https://git.kernel.org/stable/c/e4637ce34607f1733a34a57294966d26b263e626"
        }
      ],
      "title": "ALSA: usb-audio: fix OOB write in snd_usbmidi_us122l_output()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90033",
    "datePublished": "2026-09-16T10:33:33.899Z",
    "dateReserved": "2026-09-11T19:38:34.782Z",
    "dateUpdated": "2026-10-19T08:56:50.205Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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