{
  "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-2026-80718",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-80718",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-08-28T06:53:15.490Z",
    "updatedAt": "2026-08-29T06:22:34.556Z",
    "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": "mm/percpu-km: fix bitmap overflow and accounting in pcpu_create_chunk()",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/percpu-km: fix bitmap overflow and accounting in pcpu_create_chunk()\n\nIn pcpu_create_chunk(), nr_pages is the total contiguous backing\nallocation, i.e., nr_units * pcpu_unit_pages, but pcpu_chunk_populated()\nuses it to set chunk->populated, whose size is pcpu_unit_pages, bitmap. \nSince bit N in chunk->populated means page offset N inside every unit is\nbacked.  When nr_units > 1, the function writes beyond chunk->populated. \nFix it by using chunk->nr_pages.\n\nIt also fixes the global pcpu_nr_empty_pop_pages accounting, since\npcpu_balance_free() only iterates up to chunk->nr_pages.\n\nCommit a63d4ac4ab609 (\"percpu: make percpu-km set chunk->populated bitmap\nproperly\") introduced the bitmap overflow issue.  Later, commit\nb539b87fed37f (\"percpu: implmeent pcpu_nr_empty_pop_pages and\nchunk->nr_populated\") added pcpu_nr_empty_pop_pages and caused the\naccounting issue.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "a63d4ac4ab6094c051a5a240260d16117a7a2f86",
              "status": "affected",
              "versionType": "git",
              "lessThan": "5f43d2c1bea280dcdfabaf156c25e7402fb8039f"
            },
            {
              "version": "a63d4ac4ab6094c051a5a240260d16117a7a2f86",
              "status": "affected",
              "versionType": "git",
              "lessThan": "92c43ac3c2b09eb16162e8144e73c00b7c3e29d6"
            },
            {
              "version": "a63d4ac4ab6094c051a5a240260d16117a7a2f86",
              "status": "affected",
              "versionType": "git",
              "lessThan": "6fc7da2a052f2825fff785e860e67183f5acaaba"
            },
            {
              "version": "a63d4ac4ab6094c051a5a240260d16117a7a2f86",
              "status": "affected",
              "versionType": "git",
              "lessThan": "01504da375f5b19df195cb1cb1cf1dd184318f97"
            },
            {
              "version": "a63d4ac4ab6094c051a5a240260d16117a7a2f86",
              "status": "affected",
              "versionType": "git",
              "lessThan": "a6940b84c8c035da465b7165fdfcfb005545724e"
            },
            {
              "version": "a63d4ac4ab6094c051a5a240260d16117a7a2f86",
              "status": "affected",
              "versionType": "git",
              "lessThan": "32134cf9211b83bed9076d0739c5906fbea4c763"
            },
            {
              "version": "a63d4ac4ab6094c051a5a240260d16117a7a2f86",
              "status": "affected",
              "versionType": "git",
              "lessThan": "5c7fc39bf19abb38a996aaad77b3e3a8f48581c3"
            },
            {
              "version": "a63d4ac4ab6094c051a5a240260d16117a7a2f86",
              "status": "affected",
              "versionType": "git",
              "lessThan": "89b1b79c308818a715e75f28744b70d8940a07c9"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "3.18",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "3.18"
            },
            {
              "version": "5.10.265",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "version": "5.15.216",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "version": "6.1.183",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "version": "6.6.151",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "version": "6.12.103",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "version": "6.18.44",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "version": "7.1.8",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "7.1.*"
            },
            {
              "version": "7.2",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}