GHSA-HXH7-878R-VRMM

Vulnerability from github – Published: 2026-08-10 15:33 – Updated: 2026-08-19 18:32
VLAI
Details

In the Linux kernel, the following vulnerability has been resolved:

usb: gadget: uvc: clamp SEND_RESPONSE length to the response buffer

uvc_send_response() builds the UVC control response from a user-supplied struct uvc_request_data:

req->length = min_t(unsigned int, uvc->event_length, data->length);
...
memcpy(req->buf, data->data, req->length);

req->length is clamped to uvc->event_length, which is taken from the host control request wLength (up to UVC_MAX_REQUEST_SIZE, 64), and to data->length, which comes from the UVCIOC_SEND_RESPONSE ioctl and is only checked for being negative. The source buffer data->data is only 60 bytes, so a response with uvc->event_length and data->length both greater than 60 makes memcpy() read past the end of data->data.

Clamp req->length to sizeof(data->data) as well.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-68366"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-10T13:20:29Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: uvc: clamp SEND_RESPONSE length to the response buffer\n\nuvc_send_response() builds the UVC control response from a user-supplied\nstruct uvc_request_data:\n\n\treq-\u003elength = min_t(unsigned int, uvc-\u003eevent_length, data-\u003elength);\n\t...\n\tmemcpy(req-\u003ebuf, data-\u003edata, req-\u003elength);\n\nreq-\u003elength is clamped to uvc-\u003eevent_length, which is taken from the\nhost control request wLength (up to UVC_MAX_REQUEST_SIZE, 64), and to\ndata-\u003elength, which comes from the UVCIOC_SEND_RESPONSE ioctl and is\nonly checked for being negative.  The source buffer data-\u003edata is only\n60 bytes, so a response with uvc-\u003eevent_length and data-\u003elength both\ngreater than 60 makes memcpy() read past the end of data-\u003edata.\n\nClamp req-\u003elength to sizeof(data-\u003edata) as well.",
  "id": "GHSA-hxh7-878r-vrmm",
  "modified": "2026-08-19T18:32:17Z",
  "published": "2026-08-10T15:33:48Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-68366"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1f03658f3e9b2f8fd1d1003ba389a0390b49a350"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4e116372b7a4f87df0dc0ed4b0ab5b0bb0cc5796"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/568e68d8f80395a64848aa2946af8ade72da0ffb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/662f6c6c6ff8a6c508e1646c09cae74e28f3cca6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/82ec2c1e456b17451f0736c3983402642f961733"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b70dc75e85ba968b7b76eebfe5d63000080b875b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c8510fbbea09ef0170b56b14dc2b5890dc75be07"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/eaf783c005299a702f2cc96b08cd21ede081f098"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}



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