ksmbd: fix use-after-free in session logoff

{
  "id": "bcdccceba6b88117842df4280e17b0f3f41b5e3e28f0b71a97e38e5111245c34",
  "url": "https://osv.dev/vulnerability/CVE-2025-37899",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "ksmbd: fix use-after-free in session logoff",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free in session logoff The sess->user object can currently be in use by another thread, for example if another connection has sent a session setup request to bind to the session being free'd. The handler for that connection could be in the smb2_sess_setup function which makes use of sess->user.",
    "evidence": "osv:CVE-2025-37899",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.1.159",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.119",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.28",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.14.6",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2025-37899",
      "aliases": [
        "CVE-2025-37899"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                },
                {
                  "fixed": "931dc8a3670f71c45c0b1379ea4e92dafbda1aca"
                },
                {
                  "fixed": "70ad6455139e26e85f48f95d0e21f351c1909342"
                },
                {
                  "fixed": "d5ec1d79509b3ee01de02c236f096bc050221b7f"
                },
                {
                  "fixed": "02d16046cd11a5c037b28c12ffb818c56dd3ef43"
                },
                {
                  "fixed": "2fc9feff45d92a92cd5f96487655d5be23fb7e2b"
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              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-37899.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.15.0"
                },
                {
                  "fixed": "6.1.159"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
                },
                {
                  "fixed": "6.6.119"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.12.28"
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              ]
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            {
              "type": "ECOSYSTEM",
              "events": [
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                  "introduced": "6.13.0"
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                {
                  "fixed": "6.14.6"
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          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-37899.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:23.403223891Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/02d16046cd11a5c037b28c12ffb818c56dd3ef43",
        "https://git.kernel.org/stable/c/2fc9feff45d92a92cd5f96487655d5be23fb7e2b",
        "https://git.kernel.org/stable/c/70ad6455139e26e85f48f95d0e21f351c1909342",
        "https://git.kernel.org/stable/c/931dc8a3670f71c45c0b1379ea4e92dafbda1aca",
        "https://git.kernel.org/stable/c/d5ec1d79509b3ee01de02c236f096bc050221b7f",
        "https://news.ycombinator.com/item?id=44081338",
        "https://sean.heelan.io/2025/05/22/how-i-used-o3-to-find-cve-2025-37899-a-remote-zeroday-vulnerability-in-the-linux-kernels-smb-implementation/",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/37xxx/CVE-2025-37899.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-37899",
        "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/2025/37xxx/CVE-2025-37899.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-37899",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 489854,
  "published_at": "2025-05-20T15:21:34.782+00:00"
}