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GHSA-3999-X38P-C9QG

Vulnerability from github – Published: 2026-09-16 12:30 – Updated: 2026-09-16 12:30

Details

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.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-90033"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-16T11:17:16Z",
    "severity": null
  },
  "details": "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.",
  "id": "GHSA-3999-x38p-c9qg",
  "modified": "2026-09-16T12:30:46Z",
  "published": "2026-09-16T12:30:46Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-90033"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1d4add2b832b56f81bb0eab065ec35c610343018"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2dae0e3a59e31f78222279d544b98e747cd1fbff"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5538daf2a5cc80ac3f3e913c0db045d92d995d40"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9392a2c346762ffee8edd1ba8bac50d2e24a2ed7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9d81885d97cba7796d1f8edc88f2499c8296f5b9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a441a8e52148c91c2f2a91f42e3b9bc961a13a4b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/de6d252f115be887a701c09a05cdb076f3a590c9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e4637ce34607f1733a34a57294966d26b263e626"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-90033 (GCVE-0-2026-90033)

Vulnerability from cvelistv5 – Published: 2026-09-16 10:33 – Updated: 2026-09-16 10:33

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.

Severity

No CVSS data available.

Assigner

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/5538daf2a5cc80ac3…
https://git.kernel.org/stable/c/a441a8e52148c91c2…
https://git.kernel.org/stable/c/2dae0e3a59e31f782…
https://git.kernel.org/stable/c/1d4add2b832b56f81…
https://git.kernel.org/stable/c/de6d252f115be887a…
https://git.kernel.org/stable/c/9392a2c346762ffee…
https://git.kernel.org/stable/c/9d81885d97cba7796…
https://git.kernel.org/stable/c/e4637ce34607f1733…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 030a07e441296c372f946cd4065b5d831d8dc40c , < 5538daf2a5cc80ac3f3e913c0db045d92d995d40 (git) Affected: 030a07e441296c372f946cd4065b5d831d8dc40c , < a441a8e52148c91c2f2a91f42e3b9bc961a13a4b (git) Affected: 030a07e441296c372f946cd4065b5d831d8dc40c , < 2dae0e3a59e31f78222279d544b98e747cd1fbff (git) Affected: 030a07e441296c372f946cd4065b5d831d8dc40c , < 1d4add2b832b56f81bb0eab065ec35c610343018 (git) Affected: 030a07e441296c372f946cd4065b5d831d8dc40c , < de6d252f115be887a701c09a05cdb076f3a590c9 (git) Affected: 030a07e441296c372f946cd4065b5d831d8dc40c , < 9392a2c346762ffee8edd1ba8bac50d2e24a2ed7 (git) Affected: 030a07e441296c372f946cd4065b5d831d8dc40c , < 9d81885d97cba7796d1f8edc88f2499c8296f5b9 (git) Affected: 030a07e441296c372f946cd4065b5d831d8dc40c , < e4637ce34607f1733a34a57294966d26b263e626 (git)
Linux	Linux	Affected: 2.6.28 Unaffected: 0 , < 2.6.28 (semver) Unaffected: 5.10.270 , ≤ 5.10.* (semver) Unaffected: 5.15.221 , ≤ 5.15.* (semver) Unaffected: 6.1.188 , ≤ 6.1.* (semver) Unaffected: 6.6.157 , ≤ 6.6.* (semver) Unaffected: 6.12.110 , ≤ 6.12.* (semver) Unaffected: 6.18.51 , ≤ 6.18.* (semver) Unaffected: 7.2.5 , ≤ 7.2.* (semver) Unaffected: 7.3-rc2 , ≤ * (original_commit_for_fix)

Show details on NVD website

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          "programFiles": [
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              "status": "unaffected",
              "version": "0",
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            },
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              "status": "unaffected",
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            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.221",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
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              "status": "unaffected",
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              "status": "unaffected",
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              "status": "unaffected",
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          "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": {
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          "url": "https://git.kernel.org/stable/c/9d81885d97cba7796d1f8edc88f2499c8296f5b9"
        },
        {
          "url": "https://git.kernel.org/stable/c/e4637ce34607f1733a34a57294966d26b263e626"
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      ],
      "title": "ALSA: usb-audio: fix OOB write in snd_usbmidi_us122l_output()",
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}

Sightings

Author	Source	Type	Date	Other

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.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
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.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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