Bluetooth: L2CAP: Fix accepting multiple L2CAP_ECRED_CONN_REQ

{
  "id": "0c5517dae245279d07451b33c844f1a4976787cb89f8506cca918e4445cad758",
  "url": "https://osv.dev/vulnerability/CVE-2026-23395",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Bluetooth: L2CAP: Fix accepting multiple L2CAP_ECRED_CONN_REQ",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Fix accepting multiple L2CAP_ECRED_CONN_REQ Currently the code attempts to accept requests regardless of the command identifier which may cause multiple requests to be marked as pending (FLAG_DEFER_SETUP) which can cause more than L2CAP_ECRED_MAX_CID(5) to be allocated in l2cap_ecred_rsp_defer causing an overflow. The spec is quite clear that the same identifier shall not be used on subsequent requests: 'Within each signaling channel a different Identifier shall be used for each successive request or indication.' https://www.bluetooth.com/wp-content/uploads/Files/Specification/HTML/Core-62/out/en/host/logical-link-control-and-adaptation-protocol-specification.html#UUID-32a25a06-4aa4-c6c7-77c5-dcfe3682355d So this attempts to check if there are any channels pending with the same identifier and rejects if any are found.",
    "evidence": "osv:CVE-2026-23395",
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    "severity": "high",
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      "aliases": [
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      "modified": "2026-10-28T02:30:25.383897869Z",
      "provider": "osv",
      "references": [
        "https://cert-portal.siemens.com/productcert/html/ssa-784472.html",
        "https://git.kernel.org/stable/c/10a7a702542240d5edb2b39450ac951c59ccd009",
        "https://git.kernel.org/stable/c/2124d82fd25e1671bb3ceb37998af5aae5903e06",
        "https://git.kernel.org/stable/c/46e5b71666fb7652082e4e214a3365f4b14f1dc3",
        "https://git.kernel.org/stable/c/5b3e2052334f2ff6d5200e952f4aa66994d09899",
        "https://git.kernel.org/stable/c/6b949a6b33cbdf621d9fc6f0c48ac00915dbf514",
        "https://git.kernel.org/stable/c/8d0d94f8ba5b3a0beec3b0da558b9bea48018117",
        "https://git.kernel.org/stable/c/e72ee455297b794b852e5cea8d2d7bb17312172a",
        "https://git.kernel.org/stable/c/fb4a3a26483f3ea2cd21c7a2f7c45d5670600465",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23395.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-23395",
        "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/2026/23xxx/CVE-2026-23395.json"
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    },
    "related_cves": [
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        "value": "CVE-2026-23395",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 492117,
  "published_at": "2026-03-25T10:33:18.936+00:00"
}