ksmbd: validate zero num_subauth before sub_auth is accessed

{
  "id": "29ae4b5b47059cbdaf538f565c7b7105e28b83cf145bf371e8a114de75366718",
  "url": "https://osv.dev/vulnerability/CVE-2025-22038",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "ksmbd: validate zero num_subauth before sub_auth is accessed",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: ksmbd: validate zero num_subauth before sub_auth is accessed Access psid->sub_auth[psid->num_subauth - 1] without checking if num_subauth is non-zero leads to an out-of-bounds read. This patch adds a validation step to ensure num_subauth != 0 before sub_auth is accessed.",
    "evidence": "osv:CVE-2025-22038",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.1.134",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.87",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.23",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.13.11",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.14.2",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2025-22038",
      "aliases": [
        "CVE-2025-22038"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                {
                  "fixed": "3ac65de111c686c95316ade660f8ba7aea3cd3cc"
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                {
                  "fixed": "0e36a3e080d6d8bd7a34e089345d043da4ac8283"
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                {
                  "fixed": "56de7778a48560278c334077ace7b9ac4bfb2fd1"
                },
                {
                  "fixed": "68c6c3142bfcdb049839d40a9a59ebe8ea865002"
                },
                {
                  "fixed": "c8bfe1954a0b89e7b29b3a3e7f4c5e0ebd295e20"
                },
                {
                  "fixed": "bf21e29d78cd2c2371023953d9c82dfef82ebb36"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-22038.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.15.0"
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                  "fixed": "6.1.134"
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                  "introduced": "6.2.0"
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                  "fixed": "6.6.87"
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            {
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                  "introduced": "6.14.0"
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          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-22038.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:50.903407990Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/0e36a3e080d6d8bd7a34e089345d043da4ac8283",
        "https://git.kernel.org/stable/c/3ac65de111c686c95316ade660f8ba7aea3cd3cc",
        "https://git.kernel.org/stable/c/56de7778a48560278c334077ace7b9ac4bfb2fd1",
        "https://git.kernel.org/stable/c/68c6c3142bfcdb049839d40a9a59ebe8ea865002",
        "https://git.kernel.org/stable/c/bf21e29d78cd2c2371023953d9c82dfef82ebb36",
        "https://git.kernel.org/stable/c/c8bfe1954a0b89e7b29b3a3e7f4c5e0ebd295e20",
        "https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/22xxx/CVE-2025-22038.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-22038",
        "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/2025/22xxx/CVE-2025-22038.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-22038",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 519141,
  "published_at": "2025-04-16T14:11:56.316+00:00"
}