{
  "schemaVersion": 1,
  "attribution": [
    {
      "source": "CISA Known Exploited Vulnerabilities",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "licence": "US government work"
    },
    {
      "source": "GitHub Advisory Database",
      "url": "https://github.com/advisories",
      "licence": "CC BY 4.0"
    },
    {
      "source": "Have I Been Pwned",
      "url": "https://haveibeenpwned.com/",
      "licence": "CC BY 4.0"
    },
    {
      "source": "CVE Program (CVE records)",
      "url": "https://www.cve.org/Legal/TermsOfUse",
      "licence": "CVE Terms of Use",
      "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.",
      "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss/",
      "licence": "free to use; FIRST requests attribution"
    }
  ],
  "record": {
    "id": "CVE-2021-47579",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2021-47579",
    "idYear": 2021,
    "status": "PUBLISHED",
    "publishedAt": "2024-06-19T14:53:46.750Z",
    "updatedAt": "2026-05-11T13:57:17.709Z",
    "importedAt": "2026-10-24T01:56:36.661Z",
    "snapshot": {
      "id": "cve_2026-10-24_midnight_baseline",
      "at": "2026-10-24T00:00:00.000Z",
      "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z"
    },
    "facts": {
      "title": "ovl: fix warning in ovl_create_real()",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\novl: fix warning in ovl_create_real()\n\nSyzbot triggered the following warning in ovl_workdir_create() ->\novl_create_real():\n\n\tif (!err && WARN_ON(!newdentry->d_inode)) {\n\nThe reason is that the cgroup2 filesystem returns from mkdir without\ninstantiating the new dentry.\n\nWeird filesystems such as this will be rejected by overlayfs at a later\nstage during setup, but to prevent such a warning, call ovl_mkdir_real()\ndirectly from ovl_workdir_create() and reject this case early.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "e9be9d5e76e34872f0c37d72e25bc27fe9e2c54c",
              "status": "affected",
              "versionType": "git",
              "lessThan": "445d2dc63e5871d218f21b8f62ab29ac72f2e6b8"
            },
            {
              "version": "e9be9d5e76e34872f0c37d72e25bc27fe9e2c54c",
              "status": "affected",
              "versionType": "git",
              "lessThan": "f9f300a92297be8250547347fd52216ef0177ae0"
            },
            {
              "version": "e9be9d5e76e34872f0c37d72e25bc27fe9e2c54c",
              "status": "affected",
              "versionType": "git",
              "lessThan": "6859985a2fbda5d1586bf44538853e1be69e85f7"
            },
            {
              "version": "e9be9d5e76e34872f0c37d72e25bc27fe9e2c54c",
              "status": "affected",
              "versionType": "git",
              "lessThan": "d2ccdd4e4efab06178608a34d7bfb20a54104c02"
            },
            {
              "version": "e9be9d5e76e34872f0c37d72e25bc27fe9e2c54c",
              "status": "affected",
              "versionType": "git",
              "lessThan": "1f5573cfe7a7056e80a92c7a037a3e69f3a13d1c"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "3.18",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "3.18"
            },
            {
              "version": "4.19.222",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "4.19.*"
            },
            {
              "version": "5.4.168",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.4.*"
            },
            {
              "version": "5.10.88",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "version": "5.15.11",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "version": "5.16",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}