GHSA-2QWP-9C8H-MRVC

Vulnerability from github – Published: 2026-05-01 15:30 – Updated: 2026-06-19 15:33
VLAI
Details

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

Bluetooth: hci_conn: fix potential UAF in set_cig_params_sync

hci_conn lookup and field access must be covered by hdev lock in set_cig_params_sync, otherwise it's possible it is freed concurrently.

Take hdev lock to prevent hci_conn from being deleted or modified concurrently. Just RCU lock is not suitable here, as we also want to avoid "tearing" in the configuration.

Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2026-43019"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-416"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-01T15:16:46Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_conn: fix potential UAF in set_cig_params_sync\n\nhci_conn lookup and field access must be covered by hdev lock in\nset_cig_params_sync, otherwise it\u0027s possible it is freed concurrently.\n\nTake hdev lock to prevent hci_conn from being deleted or modified\nconcurrently.  Just RCU lock is not suitable here, as we also want to\navoid \"tearing\" in the configuration.",
  "id": "GHSA-2qwp-9c8h-mrvc",
  "modified": "2026-06-19T15:33:09Z",
  "published": "2026-05-01T15:30:36Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43019"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/66d432e9b45bae7881ffcdb12cd8fd0bf254ef02"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7502c1cf303b69f71d085f5ff7251b0e1b0f09df"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7d568fede8eac91161a60b710aa920abe9b0fb9f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a2639a7f0f5bf7d73f337f8f077c19415c62ed2c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bad65b4b0a96139f023eadc28a33125963208449"
    }
  ],
  "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"
    }
  ]
}


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