ksmbd: fix session use-after-free in multichannel connection

{
  "id": "94be30b8dbb9e614145d1a7bcd4eec9d5c2d1b70f868a591b0c59bde027f656c",
  "url": "https://osv.dev/vulnerability/CVE-2025-22040",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "ksmbd: fix session use-after-free in multichannel connection",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix session use-after-free in multichannel connection There is a race condition between session setup and ksmbd_sessions_deregister. The session can be freed before the connection is added to channel list of session. This patch check reference count of session before freeing it.",
    "evidence": "osv:CVE-2025-22040",
    "products": [
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          {
            "value": "6.12.23",
            "evidence": "/affected/1/ranges"
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          {
            "value": "6.13.11",
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            "value": "6.14.2",
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    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2025-22040",
      "aliases": [
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      "metrics": [
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          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
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      ],
      "modified": "2026-10-28T02:30:48.957048167Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/3980770cb1470054e6400fd97668665975726737",
        "https://git.kernel.org/stable/c/596407adb9af1ee75fe7c7529607783d31b66e7f",
        "https://git.kernel.org/stable/c/7dfbd4c43eed91dd2548a95236908025707a8dfd",
        "https://git.kernel.org/stable/c/9069939d762138e232a6f79e3e1462682ed6a17d",
        "https://git.kernel.org/stable/c/94c281721d4ed2d972232414b91d98a6f5bdb16b",
        "https://git.kernel.org/stable/c/fa4cdb8cbca7d6cb6aa13e4d8d83d1103f6345db",
        "https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/22xxx/CVE-2025-22040.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-22040",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
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      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/22xxx/CVE-2025-22040.json"
      }
    },
    "related_cves": [
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        "value": "CVE-2025-22040",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
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  "source_id": "core-osv",
  "document_id": 516790,
  "published_at": "2025-04-16T14:11:57.601+00:00"
}