ksmbd: fix null pointer dereference in destroy_previous_session

{
  "id": "88af7990bf1ad79a832f65a04cc3d43ff6b30a3f970748e350f72fc249591b9e",
  "url": "https://osv.dev/vulnerability/CVE-2025-38191",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "ksmbd: fix null pointer dereference in destroy_previous_session",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix null pointer dereference in destroy_previous_session If client set ->PreviousSessionId on kerberos session setup stage, NULL pointer dereference error will happen. Since sess->user is not set yet, It can pass the user argument as NULL to destroy_previous_session. sess->user will be set in ksmbd_krb5_authenticate(). So this patch move calling destroy_previous_session() after ksmbd_krb5_authenticate().",
    "evidence": "osv:CVE-2025-38191",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.1.142",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.95",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.35",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.15.4",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2025-38191",
      "aliases": [
        "CVE-2025-38191"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                  "introduced": "0626e6641f6b467447c81dd7678a69c66f7746cf"
                },
                {
                  "fixed": "281afc52e2961cd5dd8326ebc9c5bc40904c0468"
                },
                {
                  "fixed": "0902625a24eea7fdc187faa5d97df244d159dd6e"
                },
                {
                  "fixed": "1193486dffb7432a09f57f5d09049b4d4123538b"
                },
                {
                  "fixed": "076f1adefb9837977af7ed233883842ddc446644"
                },
                {
                  "fixed": "7ac5b66acafcc9292fb935d7e03790f2b8b2dc0e"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-38191.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.15.0"
                },
                {
                  "fixed": "6.1.142"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
                },
                {
                  "fixed": "6.6.95"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.12.35"
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              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.15.4"
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              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-38191.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:33.401186938Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/076f1adefb9837977af7ed233883842ddc446644",
        "https://git.kernel.org/stable/c/0902625a24eea7fdc187faa5d97df244d159dd6e",
        "https://git.kernel.org/stable/c/1193486dffb7432a09f57f5d09049b4d4123538b",
        "https://git.kernel.org/stable/c/281afc52e2961cd5dd8326ebc9c5bc40904c0468",
        "https://git.kernel.org/stable/c/7ac5b66acafcc9292fb935d7e03790f2b8b2dc0e",
        "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/38xxx/CVE-2025-38191.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-38191",
        "https://www.zerodayinitiative.com/advisories/ZDI-25-610/",
        "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/2025/38xxx/CVE-2025-38191.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-38191",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 500286,
  "published_at": "2025-07-04T13:37:15.736+00:00"
}