{
  "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-2021-47055",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2021-47055",
    "idYear": 2021,
    "status": "PUBLISHED",
    "publishedAt": "2024-02-29T22:37:30.071Z",
    "updatedAt": "2026-08-05T08:45:45.258Z",
    "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": "mtd: require write permissions for locking and badblock ioctls",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nmtd: require write permissions for locking and badblock ioctls\n\nMEMLOCK, MEMUNLOCK and OTPLOCK modify protection bits. Thus require\nwrite permission. Depending on the hardware MEMLOCK might even be\nwrite-once, e.g. for SPI-NOR flashes with their WP# tied to GND. OTPLOCK\nis always write-once.\n\nMEMSETBADBLOCK modifies the bad block table.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "1c9f9125892a43901438bf704ada6b7019e2a884",
              "status": "affected",
              "versionType": "git",
              "lessThan": "f4d28d8b9b0e7c4ae04214b8d7e0b0466ec6bcaf"
            },
            {
              "version": "583d42400532fbd6228b0254d7c732b771e4750d",
              "status": "affected",
              "versionType": "git",
              "lessThan": "9625b00cac6630479c0ff4b9fafa88bee636e1f0"
            },
            {
              "version": "389c74c218d3b182e9cd767e98cee0e0fd0dabaa",
              "status": "affected",
              "versionType": "git",
              "lessThan": "f73b29819c6314c0ba8b7d5892dfb03487424bee"
            },
            {
              "version": "ab1a602a9cea98aa37b2e6851b168d2a2633a58d",
              "status": "affected",
              "versionType": "git",
              "lessThan": "75ed985bd6c8ac1d4e673e93ea9d96c9908c1d37"
            },
            {
              "version": "9a53e8bd59d9f070505e51d3fd19606a270e6b93",
              "status": "affected",
              "versionType": "git",
              "lessThan": "5880afefe0cb9b2d5e801816acd58bfe91a96981"
            },
            {
              "version": "f7e6b19bc76471ba03725fe58e0c218a3d6266c3",
              "status": "affected",
              "versionType": "git",
              "lessThan": "7b6552719c0ccbbea29dde4be141da54fdb5877e"
            },
            {
              "version": "f7e6b19bc76471ba03725fe58e0c218a3d6266c3",
              "status": "affected",
              "versionType": "git",
              "lessThan": "077259f5e777c3c8821f6b41dee709fcda27306b"
            },
            {
              "version": "f7e6b19bc76471ba03725fe58e0c218a3d6266c3",
              "status": "affected",
              "versionType": "git",
              "lessThan": "a08799d3e8c8088640956237c183f83463c39668"
            },
            {
              "version": "f7e6b19bc76471ba03725fe58e0c218a3d6266c3",
              "status": "affected",
              "versionType": "git",
              "lessThan": "1e97743fd180981bef5f01402342bb54bf1c6366"
            },
            {
              "version": "36a8b2f49235e63ab3f901fe12e1b6732f075c2e",
              "status": "affected",
              "versionType": "git"
            },
            {
              "version": "eb3d82abc335624a5e8ecfb75aba0b684e2dc4db",
              "status": "affected",
              "versionType": "git"
            },
            {
              "version": "4.4.233",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "4.4.269"
            },
            {
              "version": "4.9.233",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "4.9.269"
            },
            {
              "version": "4.14.194",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "4.14.233"
            },
            {
              "version": "4.19.139",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "4.19.191"
            },
            {
              "version": "5.4.58",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "5.4.119"
            },
            {
              "version": "5.7.15",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "5.8"
            },
            {
              "version": "5.8.1",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "5.9"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "5.9",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "5.9"
            },
            {
              "version": "4.4.269",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "4.4.*"
            },
            {
              "version": "4.9.269",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "4.9.*"
            },
            {
              "version": "4.14.233",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "4.14.*"
            },
            {
              "version": "4.19.191",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "4.19.*"
            },
            {
              "version": "5.4.119",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.4.*"
            },
            {
              "version": "5.10.37",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "version": "5.11.21",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.11.*"
            },
            {
              "version": "5.12.4",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.12.*"
            },
            {
              "version": "5.13",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}