{
  "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-2026-80807",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-80807",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-09-04T15:13:23.605Z",
    "updatedAt": "2026-10-19T08:44:00.360Z",
    "importedAt": "2026-10-24T01:58:30.346Z",
    "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: reject invalid block index in GC ioctl",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nnilfs2: reject invalid block index in GC ioctl\n\nSyzbot reported list corruption caused by a double list_add_tail() call on\nbh->b_assoc_buffers within nilfs_lookup_dirty_data_buffers().\n\nAnalysis revealed that the root cause was the insertion of a page/folio\nwith a page index of ULONG_MAX into the page cache via the GC ioctl.\nfilemap_get_folios_tag(), called by nilfs_lookup_dirty_data_buffers(),\nrepeatedly detects a dirty folio with a page index of ULONG_MAX due to\nindex wrap-around, leading to duplicate processing of dirty buffers.\n\nAs a preparatory step, the GC ioctl loads the page/folio of the block to\nbe moved during GC and inserts it into the page cache based on information\nin the nilfs_vdesc structure passed as an argument.  Normally, this does\nnot cause issues because the user-space GC library configures the\nnilfs_vdesc structure properly.  However, since there is no range check on\nthe parameters determining the page index, a request with artificially\ncrafted parameters -- such as those generated by Syzbot -- can result in a\npage/folio being inserted with a page index of ULONG_MAX, triggering the\nabove problem.\n\nThis resolves the issue by checking the ranges of 'vd_offset' and\n'vd_vblocknr' in the nilfs_vdesc structure that determine the page index,\nthereby preventing the invalid page/folio insertions.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "7942b919f7321f95a777d396ff7894a7a83dc9b0",
              "status": "affected",
              "versionType": "git",
              "lessThan": "898404cdf882d7b54f1132f75570984ca3214796"
            },
            {
              "version": "7942b919f7321f95a777d396ff7894a7a83dc9b0",
              "status": "affected",
              "versionType": "git",
              "lessThan": "ba8a8b563a28d358c45c62a306d421434a058648"
            },
            {
              "version": "7942b919f7321f95a777d396ff7894a7a83dc9b0",
              "status": "affected",
              "versionType": "git",
              "lessThan": "3bd064ccc70b85f9a3d53aece29dc8473be5a226"
            },
            {
              "version": "7942b919f7321f95a777d396ff7894a7a83dc9b0",
              "status": "affected",
              "versionType": "git",
              "lessThan": "a5e776e2937581d67ec5b9b4d27b0f70d7baa6b1"
            },
            {
              "version": "7942b919f7321f95a777d396ff7894a7a83dc9b0",
              "status": "affected",
              "versionType": "git",
              "lessThan": "68aa9ab6f8f2895713aa6ddf781463ed8ea5ba44"
            },
            {
              "version": "7942b919f7321f95a777d396ff7894a7a83dc9b0",
              "status": "affected",
              "versionType": "git",
              "lessThan": "e447f7edb99bd00cec63d6f3049e2e5074946f71"
            },
            {
              "version": "7942b919f7321f95a777d396ff7894a7a83dc9b0",
              "status": "affected",
              "versionType": "git",
              "lessThan": "ec6ddf271dfa4c7e3147bc2c8b2bad4315f316a1"
            },
            {
              "version": "7942b919f7321f95a777d396ff7894a7a83dc9b0",
              "status": "affected",
              "versionType": "git",
              "lessThan": "fbcfb75c20d71a5b542ad4ac3b79d10b997c8152"
            },
            {
              "version": "7942b919f7321f95a777d396ff7894a7a83dc9b0",
              "status": "affected",
              "versionType": "git",
              "lessThan": "a1735eae55448bc79c2da6593455791e886f6ed8"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "2.6.30",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "2.6.30"
            },
            {
              "version": "5.10.269",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "version": "5.15.220",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "version": "6.1.187",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "version": "6.6.156",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "version": "6.12.108",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "version": "6.18.47",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "version": "7.1.11",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "7.1.*"
            },
            {
              "version": "7.2.1",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "7.2.*"
            },
            {
              "version": "7.3",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}