GHSA-F752-7J6X-76W7

Vulnerability from github – Published: 2026-10-18 18:32 – Updated: 2026-10-30 15:33
VLAI
Details

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

usb: core: clear both ep_in and ep_out for non-ep0 control endpoints

In usb_enable_endpoint(), non-zero control endpoints (where usb_endpoint_xfer_control(&ep->desc) is true) populate both dev->ep_in[epnum] and dev->ep_out[epnum] with the same struct usb_host_endpoint pointer.

However, usb_disable_endpoint() only clears either dev->ep_out[epnum] or dev->ep_in[epnum] depending on the direction bit of epaddr when reset_hardware is set, leaving the opposite direction's array slot pointing to the disabled/freed endpoint.

Clear both dev->ep_out[epnum] and dev->ep_in[epnum] when disabling a non-ep0 control endpoint with reset_hardware set, and update the function kerneldoc accordingly.

Tested in QEMU against Linux 7.3.0-rc3 using dummy_hcd and raw-gadget to enumerate a USB device with a non-zero control endpoint (bEndpointAddress 0x01, bmAttributes USB_ENDPOINT_XFER_CONTROL), verifying that both dev->ep_in[1] and dev->ep_out[1] are cleared when the interface is disabled.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-98763"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-18T16:17:30Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: core: clear both ep_in and ep_out for non-ep0 control endpoints\n\nIn usb_enable_endpoint(), non-zero control endpoints (where\nusb_endpoint_xfer_control(\u0026ep-\u003edesc) is true) populate both\ndev-\u003eep_in[epnum] and dev-\u003eep_out[epnum] with the same struct\nusb_host_endpoint pointer.\n\nHowever, usb_disable_endpoint() only clears either dev-\u003eep_out[epnum] or\ndev-\u003eep_in[epnum] depending on the direction bit of epaddr when\nreset_hardware is set, leaving the opposite direction\u0027s array slot\npointing to the disabled/freed endpoint.\n\nClear both dev-\u003eep_out[epnum] and dev-\u003eep_in[epnum] when disabling a\nnon-ep0 control endpoint with reset_hardware set, and update the\nfunction kerneldoc accordingly.\n\nTested in QEMU against Linux 7.3.0-rc3 using dummy_hcd and raw-gadget to\nenumerate a USB device with a non-zero control endpoint\n(bEndpointAddress 0x01, bmAttributes USB_ENDPOINT_XFER_CONTROL),\nverifying that both dev-\u003eep_in[1] and dev-\u003eep_out[1] are cleared when\nthe interface is disabled.",
  "id": "GHSA-f752-7j6x-76w7",
  "modified": "2026-10-30T15:33:59Z",
  "published": "2026-10-18T18:32:02Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98763"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0e8baa78d872f2db440d8b9ded946ab8dceb89eb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/198d74dcfa129523125f46a89479d3b446b17dbe"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1da16c46b8d7101b74bc2d72a04e23cf5c7ddea1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/59d2c9d70fa42e2290ff68e6430d38a1c817fcb7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7a9f61476b0e8002092a52ee8295edeeb0a28d1e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a7928ad4bbb330dfb0f726166384f319d66eb5d1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b521fe45e06b3f7042e6d1f9566ddb6f179dcb1d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c50413ecb662ea43c7f487632c8114721743a277"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}



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