{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9"
            },
            {
              "fixed": "f0e5c9c663badc9982e6941322eef1cb17de0f11"
            },
            {
              "fixed": "18d8db24b0a5b7be4829238dd4022236df02d421"
            },
            {
              "fixed": "1c9d0646a9959752f11ca1080dc1ff26bd1756cb"
            },
            {
              "fixed": "69f030cf95488ae1186c72ac8c66fd279664ea7f"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.15.0"
            },
            {
              "fixed": "6.12.92"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.34"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.0.11"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64138.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: validate SID in parent security descriptor during ACL inheritance\n\nIntroduce smb_validate_ntsd_sid() helper to safely validate Owner SID\nand Group SID inside the NT Security Descriptor (smb_ntsd) retrieved\nfrom the parent directory.",
  "id": "CVE-2026-64138",
  "modified": "2026-08-12T03:51:28.325785285Z",
  "published": "2026-07-19T15:40:31.760Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/18d8db24b0a5b7be4829238dd4022236df02d421"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1c9d0646a9959752f11ca1080dc1ff26bd1756cb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/69f030cf95488ae1186c72ac8c66fd279664ea7f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f0e5c9c663badc9982e6941322eef1cb17de0f11"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64138.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64138"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "ksmbd: validate SID in parent security descriptor during ACL inheritance"
}