{
  "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-2021-47087",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2021-47087",
    "idYear": 2021,
    "status": "PUBLISHED",
    "publishedAt": "2024-03-04T18:10:17.107Z",
    "updatedAt": "2026-08-05T08:45:56.013Z",
    "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": "tee: optee: Fix incorrect page free bug",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\ntee: optee: Fix incorrect page free bug\n\nPointer to the allocated pages (struct page *page) has already\nprogressed towards the end of allocation. It is incorrect to perform\n__free_pages(page, order) using this pointer as we would free any\narbitrary pages. Fix this by stop modifying the page pointer.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "3c712f14d8a9354a8807c15c64c8dd334499cc42",
              "status": "affected",
              "versionType": "git",
              "lessThan": "806142c805cacd098e61bdc0f72c778a2389fe4a"
            },
            {
              "version": "1340dc3fb75ea69221f4f5dcb0cbace55ad0331c",
              "status": "affected",
              "versionType": "git",
              "lessThan": "ad338d825e3f7b96ee542bf313728af2d19fe9ad"
            },
            {
              "version": "ec185dd3ab257dc2a60953fdf1b6622f524cc5b7",
              "status": "affected",
              "versionType": "git",
              "lessThan": "91e94e42f6fc49635f1a16d8ae3f79552bcfda29"
            },
            {
              "version": "ec185dd3ab257dc2a60953fdf1b6622f524cc5b7",
              "status": "affected",
              "versionType": "git",
              "lessThan": "18549bf4b21c739a9def39f27dcac53e27286ab5"
            },
            {
              "version": "255e17923b22cb7abd026e044416d61f6bd0eec0",
              "status": "affected",
              "versionType": "git"
            },
            {
              "version": "5.4.140",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "5.4.169"
            },
            {
              "version": "5.10.58",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "5.10.89"
            },
            {
              "version": "5.13.10",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "5.14"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "5.14",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "5.14"
            },
            {
              "version": "5.4.169",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.4.*"
            },
            {
              "version": "5.10.89",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "version": "5.15.12",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "version": "5.16",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}