GHSA-CRGV-X77W-RH88

Vulnerability from github – Published: 2026-08-15 15:30 – Updated: 2026-08-19 18:32
VLAI
Details

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

can: peak_usb: peak_usb_start(): fix double free of transfer buffer on URB submit error

In peak_usb_start(), each RX URB transfer buffer is allocated with kmalloc() and the URB is flagged URB_FREE_BUFFER so that the final usb_free_urb() also frees the transfer buffer.

If usb_submit_urb() fails, the error path frees the buffer explicitly with kfree(buf) and then calls usb_free_urb(urb). Because URB_FREE_BUFFER is set, usb_free_urb() -> urb_destroy() frees the same buffer a second time, a double free of the transfer buffer.

BUG: KASAN: double-free in usb_free_urb.part.0+0x91/0xb0 Free of addr ffff8881069ccb80 by task trigger.sh/285

Call Trace: kfree+0x113/0x3c0 usb_free_urb.part.0+0x91/0xb0

Drop the redundant kfree(buf); usb_free_urb() already releases the transfer buffer. This mirrors commit 03819abbeb11 ("net: usb: lan78xx: Fix double free issue with interrupt buffer allocation").

Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Show details on source website
To clipboard 

{
  "affected": [],
  "aliases": [
    "CVE-2026-74456"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T13:17:50Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: peak_usb: peak_usb_start(): fix double free of transfer buffer on URB submit error\n\nIn peak_usb_start(), each RX URB transfer buffer is allocated with kmalloc()\nand the URB is flagged URB_FREE_BUFFER so that the final usb_free_urb() also\nfrees the transfer buffer.\n\nIf usb_submit_urb() fails, the error path frees the buffer explicitly with\nkfree(buf) and then calls usb_free_urb(urb). Because URB_FREE_BUFFER is set,\nusb_free_urb() -\u003e urb_destroy() frees the same buffer a second time, a double\nfree of the transfer buffer.\n\n  BUG: KASAN: double-free in usb_free_urb.part.0+0x91/0xb0\n  Free of addr ffff8881069ccb80 by task trigger.sh/285\n\n  Call Trace:\n   kfree+0x113/0x3c0\n   usb_free_urb.part.0+0x91/0xb0\n\nDrop the redundant kfree(buf); usb_free_urb() already releases the transfer\nbuffer. This mirrors commit 03819abbeb11 (\"net: usb: lan78xx: Fix double free\nissue with interrupt buffer allocation\").",
  "id": "GHSA-crgv-x77w-rh88",
  "modified": "2026-08-19T18:32:27Z",
  "published": "2026-08-15T15:30:33Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74456"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4bb3325075138dd5346b71589a959878b564dc0b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/525640b93d3e5f82f4ebea4730f4e0cf799522ba"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5f2fa5840c34d3a558c57855781be75e03bef752"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/914c3b8fa175acf8476ad31cf04e308638e3578e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/92d0de80ca2223b9c7da78020155b6cb27824cc0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9b3d5a6d952c38bbcf07f903cbeadefdb56b9bc9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b9088d581fff971a7eb1628f8dcc30df6cfef4dc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/dfb17bf04a764462000f11258a7c06aa92d1f261"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.