{
  "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-2025-21811",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2025-21811",
    "idYear": 2025,
    "status": "PUBLISHED",
    "publishedAt": "2025-02-27T20:01:02.256Z",
    "updatedAt": "2026-08-05T11:54:38.930Z",
    "importedAt": "2026-10-24T01:57:29.455Z",
    "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": "nilfs2: protect access to buffers with no active references",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nnilfs2: protect access to buffers with no active references\n\nnilfs_lookup_dirty_data_buffers(), which iterates through the buffers\nattached to dirty data folios/pages, accesses the attached buffers without\nlocking the folios/pages.\n\nFor data cache, nilfs_clear_folio_dirty() may be called asynchronously\nwhen the file system degenerates to read only, so\nnilfs_lookup_dirty_data_buffers() still has the potential to cause use\nafter free issues when buffers lose the protection of their dirty state\nmidway due to this asynchronous clearing and are unintentionally freed by\ntry_to_free_buffers().\n\nEliminate this race issue by adjusting the lock section in this function.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "8c26c4e2694a163d525976e804d81cd955bbb40c",
              "status": "affected",
              "versionType": "git",
              "lessThan": "e1fc4a90a90ea8514246c45435662531975937d9"
            },
            {
              "version": "8c26c4e2694a163d525976e804d81cd955bbb40c",
              "status": "affected",
              "versionType": "git",
              "lessThan": "72cf688d0ce7e642b12ddc9b2a42524737ec1b4a"
            },
            {
              "version": "8c26c4e2694a163d525976e804d81cd955bbb40c",
              "status": "affected",
              "versionType": "git",
              "lessThan": "d8ff250e085a4c4cdda4ad1cdd234ed110393143"
            },
            {
              "version": "8c26c4e2694a163d525976e804d81cd955bbb40c",
              "status": "affected",
              "versionType": "git",
              "lessThan": "58c27fa7a610b6e8d44e6220e7dbddfbaccaf439"
            },
            {
              "version": "8c26c4e2694a163d525976e804d81cd955bbb40c",
              "status": "affected",
              "versionType": "git",
              "lessThan": "8e1b9201c9a24638cf09c6e1c9f224157328010b"
            },
            {
              "version": "8c26c4e2694a163d525976e804d81cd955bbb40c",
              "status": "affected",
              "versionType": "git",
              "lessThan": "4b08d23d7d1917bef4fbee8ad81372f49b006656"
            },
            {
              "version": "8c26c4e2694a163d525976e804d81cd955bbb40c",
              "status": "affected",
              "versionType": "git",
              "lessThan": "c437dfac9f7a5a46ac2a5e6d6acd3059e9f68188"
            },
            {
              "version": "8c26c4e2694a163d525976e804d81cd955bbb40c",
              "status": "affected",
              "versionType": "git",
              "lessThan": "367a9bffabe08c04f6d725032cce3d891b2b9e1a"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "3.10",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "3.10"
            },
            {
              "version": "5.4.291",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.4.*"
            },
            {
              "version": "5.10.235",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "version": "5.15.179",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "version": "6.1.129",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "version": "6.6.76",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "version": "6.12.13",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "version": "6.13.2",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.13.*"
            },
            {
              "version": "6.14",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}