GHSA-MGRM-7XVJ-2JR3

Vulnerability from github – Published: 2026-07-25 12:31 – Updated: 2026-07-27 06:30
VLAI
Details

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

Bluetooth: bnep: pin L2CAP connection during netdev registration

bnep_add_connection() reads the L2CAP connection without holding the channel lock, then passes its HCI device to register_netdev(). Controller teardown can clear and release that connection concurrently, leaving the network device registration path to dereference a freed parent device.

Take a reference to the L2CAP connection while holding the channel lock. Retain it until register_netdev() has taken the parent device reference.

Severity
8.8 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Show details on source website
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{
  "affected": [],
  "aliases": [
    "CVE-2026-64408"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-25T10:17:24Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: bnep: pin L2CAP connection during netdev registration\n\nbnep_add_connection() reads the L2CAP connection without holding the\nchannel lock, then passes its HCI device to register_netdev(). Controller\nteardown can clear and release that connection concurrently, leaving the\nnetwork device registration path to dereference a freed parent device.\n\nTake a reference to the L2CAP connection while holding the channel lock.\nRetain it until register_netdev() has taken the parent device reference.",
  "id": "GHSA-mgrm-7xvj-2jr3",
  "modified": "2026-07-27T06:30:36Z",
  "published": "2026-07-25T12:31:34Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64408"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/390b5db3ff8745187f094c4e915663b7b1f98944"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/46a88784c4c9b96954dd86f747ce93f65efa1302"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/551ae773ec64045b4e72099132654887e0270bcc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/563a8573047182f550b1e1e030615755cd8c41da"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a6b22dbd80926556290ad2243be25218d6956a19"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ae215c5b6422d8eda443b861b124bd1be6969c31"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bb067a99a0356196c0b89a95721985485ebce5a5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/df22adc7eafc22e651561813c11dc51a796b12ee"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}



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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

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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.
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  • 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.