{
  "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-2026-89965",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-89965",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-09-16T10:32:46.769Z",
    "updatedAt": "2026-10-19T08:55:38.886Z",
    "importedAt": "2026-10-24T01:58:35.090Z",
    "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": "nvdimm/btt: reject an arena whose nfree is below the lane count",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nnvdimm/btt: reject an arena whose nfree is below the lane count\n\nThe BTT info block's nfree field, the number of reserve free blocks, is\nread from the medium without validation.  btt_freelist_init() and\nbtt_rtt_init() size the per-lane freelist[] and rtt[] arrays by nfree,\nbut the I/O path indexes them by the lane from nd_region_acquire_lane(),\nwhich is bounded by nd_region->num_lanes (ND_MAX_LANES), not by nfree.\nA crafted or foreign arena whose nfree is below the lane count makes\nfreelist[lane]/rtt[lane] run past the allocation: an out-of-bounds write.\n\nbtt.rst documents the nlanes = min(nfree, num_cpus) invariant, which the\ncode does not currently honor: num_lanes is ND_MAX_LANES regardless of\nnfree.  Reject an arena whose nfree is below num_lanes at discovery,\nbefore the per-lane arrays are allocated, enforcing that invariant.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "5212e11fde4d40fa627668b4f2222d20db488f71",
              "status": "affected",
              "versionType": "git",
              "lessThan": "eb491343d2d1784121ad9af91c25b338c28913c3"
            },
            {
              "version": "5212e11fde4d40fa627668b4f2222d20db488f71",
              "status": "affected",
              "versionType": "git",
              "lessThan": "59d5cd1f42b4bab3609512c3cb3d3540d3d21da7"
            },
            {
              "version": "5212e11fde4d40fa627668b4f2222d20db488f71",
              "status": "affected",
              "versionType": "git",
              "lessThan": "f6c5313aae794ecca8f762c1a3493de5c266f120"
            },
            {
              "version": "5212e11fde4d40fa627668b4f2222d20db488f71",
              "status": "affected",
              "versionType": "git",
              "lessThan": "f9bf05c63b77d000e9c01f3e47af36973887d350"
            },
            {
              "version": "5212e11fde4d40fa627668b4f2222d20db488f71",
              "status": "affected",
              "versionType": "git",
              "lessThan": "6f79d1a5f2611a3d36e9312be5425cd9cb397c51"
            },
            {
              "version": "5212e11fde4d40fa627668b4f2222d20db488f71",
              "status": "affected",
              "versionType": "git",
              "lessThan": "6b1faf1f099f7060b5f1f2f0d024132581f1726e"
            },
            {
              "version": "5212e11fde4d40fa627668b4f2222d20db488f71",
              "status": "affected",
              "versionType": "git",
              "lessThan": "9dfa11cef4750b67591307f2c62e47a23d60e4b7"
            },
            {
              "version": "5212e11fde4d40fa627668b4f2222d20db488f71",
              "status": "affected",
              "versionType": "git",
              "lessThan": "6a1f2e5ed9267ca19187038ac635393c165213ac"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "4.2",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "4.2"
            },
            {
              "version": "5.10.270",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "version": "5.15.221",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "version": "6.1.188",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "version": "6.6.157",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "version": "6.12.110",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "version": "6.18.51",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "version": "7.2.5",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "7.2.*"
            },
            {
              "version": "7.3",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}