{
  "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-2021-47342",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2021-47342",
    "idYear": 2021,
    "status": "PUBLISHED",
    "publishedAt": "2024-05-21T14:35:49.643Z",
    "updatedAt": "2026-05-23T15:19:46.440Z",
    "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": "ext4: fix possible UAF when remounting r/o a mmp-protected file system",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix possible UAF when remounting r/o a mmp-protected file system\n\nAfter commit 618f003199c6 (\"ext4: fix memory leak in\next4_fill_super\"), after the file system is remounted read-only, there\nis a race where the kmmpd thread can exit, causing sbi->s_mmp_tsk to\npoint at freed memory, which the call to ext4_stop_mmpd() can trip\nover.\n\nFix this by only allowing kmmpd() to exit when it is stopped via\next4_stop_mmpd().\n\nBug-Report-Link: <20210629143603.2166962-1-yebin10@huawei.com>",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "5e4f5138bd8522ebe231a137682d3857209a2c07",
              "status": "affected",
              "versionType": "git",
              "lessThan": "b663890d854403e566169f7e90aed5cd6ff64f6b"
            },
            {
              "version": "eb7b40d9d3785f7a131fb0b1f89bb6efa46c1833",
              "status": "affected",
              "versionType": "git",
              "lessThan": "7ed572cdf11081f8f9e07abd4bea56a3f2c4edbd"
            },
            {
              "version": "618f003199c6188e01472b03cdbba227f1dc5f24",
              "status": "affected",
              "versionType": "git",
              "lessThan": "61bb4a1c417e5b95d9edb4f887f131de32e419cb"
            },
            {
              "version": "cecfdb9cf9a700d1037066173abac0617f6788df",
              "status": "affected",
              "versionType": "git"
            },
            {
              "version": "5.12.18",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "5.13"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "5.10.51",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "5.10.77"
            }
          ]
        }
      ]
    }
  }
}