Bluetooth: hci_event: fix potential UAF in hci_le_remote_conn_param_req_evt

{
  "id": "19432f8711835e3e1c8c4e7eeeedfc1d8484ed45bf07006fc7164b2bf2c9ecb6",
  "url": "https://osv.dev/vulnerability/CVE-2026-43018",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Bluetooth: hci_event: fix potential UAF in hci_le_remote_conn_param_req_evt",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_event: fix potential UAF in hci_le_remote_conn_param_req_evt hci_conn lookup and field access must be covered by hdev lock in hci_le_remote_conn_param_req_evt, otherwise it's possible it is freed concurrently. Extend the hci_dev_lock critical section to cover all conn usage.",
    "evidence": "osv:CVE-2026-43018",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
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            "value": "6.1.168",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.134",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.81",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.22",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.19.12",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-43018",
      "aliases": [
        "CVE-2026-43018"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
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                  "fixed": "1d0bdbfe3e91c11f0a704c52443a9446a10d699c"
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                  "fixed": "ea3cd36d7382d5f8309df04c275d20df139ed42c"
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                  "fixed": "b255531b27da336571411248c2a72a350662bd09"
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-43018.json"
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        {
          "ranges": [
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              "type": "ECOSYSTEM",
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          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-43018.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:44.470531687Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/1d0bdbfe3e91c11f0a704c52443a9446a10d699c",
        "https://git.kernel.org/stable/c/59eecf0ffde15670e6a5e10c47be67f73d843b20",
        "https://git.kernel.org/stable/c/5fb69e1eeea9d6cba80517e9f058b56b34bc3a81",
        "https://git.kernel.org/stable/c/7cadb03be37e761130edb153544fe0770a842b19",
        "https://git.kernel.org/stable/c/b255531b27da336571411248c2a72a350662bd09",
        "https://git.kernel.org/stable/c/ea3cd36d7382d5f8309df04c275d20df139ed42c",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43018.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-43018",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43018.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-43018",
        "evidence": "/id"
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    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 512465,
  "published_at": "2026-05-01T14:15:22.308+00:00"
}