GHSA-VM2J-8CH2-X289

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: fix UAF in bt_accept_dequeue()

bt_accept_get() takes a temporary reference before dropping the accept queue lock. bt_accept_dequeue() currently drops that reference before bt_accept_unlink(), leaving only the queue reference.

bt_accept_unlink() drops the queue reference. The subsequent sock_hold() therefore accesses freed memory if it was the final reference, as observed by KASAN during listening L2CAP socket cleanup.

Retain the temporary queue-walk reference through unlink and hand it to the caller on success. Drop it explicitly on the closed and not-yet-connected paths.

Severity
8.0 (High)
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2026-64406"
  ],
  "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: fix UAF in bt_accept_dequeue()\n\nbt_accept_get() takes a temporary reference before dropping the accept\nqueue lock. bt_accept_dequeue() currently drops that reference before\nbt_accept_unlink(), leaving only the queue reference.\n\nbt_accept_unlink() drops the queue reference. The subsequent\nsock_hold() therefore accesses freed memory if it was the final\nreference, as observed by KASAN during listening L2CAP socket cleanup.\n\nRetain the temporary queue-walk reference through unlink and hand it to\nthe caller on success. Drop it explicitly on the closed and\nnot-yet-connected paths.",
  "id": "GHSA-vm2j-8ch2-x289",
  "modified": "2026-07-27T06:30:36Z",
  "published": "2026-07-25T12:31:34Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64406"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0a98ff4e7b867f72fbb4e1237d81e9fa02ded0a0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/26168db1ce5a9766cde021b18e590a101c056614"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4bd0b274054f2679f28b70222b607bb0afc3ab9a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/50c662bdcd51b03033a0abed6716bfd377ba1049"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6303ed4bbe0095f4cc195225479bf506e010d1db"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/96ad400d5132eb333f28f6f1e2d58f0728ca9547"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c0577c55219be42b6ea2ea8db11e85bfab6f4e8d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c66a95e60b65d876a927123b0ed36bd6177d9ca6"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:A/AC:L/PR:L/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.

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