{
  "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-2026-53027",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-53027",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-06-24T16:29:35.740Z",
    "updatedAt": "2026-07-24T14:33:47.674Z",
    "importedAt": "2026-10-24T01:58:14.884Z",
    "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": "fs/ntfs3: fix missing run load for vcn0 in attr_data_get_block_locked()",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/ntfs3: fix missing run load for vcn0 in attr_data_get_block_locked()\n\nWhen a compressed or sparse attribute has its clusters frame-aligned,\nvcn is rounded down to the frame start using cmask, which can result\nin vcn != vcn0. In this case, vcn and vcn0 may reside in different\nattribute segments.\n\nThe code already handles the case where vcn is in a different segment\nby loading its runs before allocation. However, it fails to load runs\nfor vcn0 when vcn0 resides in a different segment than vcn. This causes\nrun_lookup_entry() to return SPARSE_LCN for vcn0 since its segment was\nnever loaded into the in-memory run list, triggering the WARN_ON(1).\n\nFix this by adding a missing check for vcn0 after the existing vcn\nsegment check. If vcn0 falls outside the current segment range\n[svcn, evcn1), find and load the attribute segment containing vcn0\nbefore performing the run lookup.\n\nThe following scenario triggers the bug:\n  attr_data_get_block_locked()\n    vcn = vcn0 & cmask        <- vcn != vcn0 after frame alignment\n    load runs for vcn segment <- vcn0 segment not loaded!\n    attr_allocate_clusters()  <- allocation succeeds\n    run_lookup_entry(vcn0)    <- vcn0 not in run -> SPARSE_LCN\n    WARN_ON(1)                <- bug fires here!",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "c380b52f6c5702cc4bdda5e6d456d6c19a201a0b",
              "status": "affected",
              "versionType": "git",
              "lessThan": "ea59d9dbc5504e29d420ac4aab774cbce39b0e69"
            },
            {
              "version": "c380b52f6c5702cc4bdda5e6d456d6c19a201a0b",
              "status": "affected",
              "versionType": "git",
              "lessThan": "d68a14450783ecc5fddae957ac4e1c546dfcfb73"
            },
            {
              "version": "c380b52f6c5702cc4bdda5e6d456d6c19a201a0b",
              "status": "affected",
              "versionType": "git",
              "lessThan": "08fad5d5a26cc55c0ecb68ac59ba3be5e31f4147"
            },
            {
              "version": "c380b52f6c5702cc4bdda5e6d456d6c19a201a0b",
              "status": "affected",
              "versionType": "git",
              "lessThan": "2b4ae1ce613ade8a7e118fba4a5a77cd23e97e54"
            },
            {
              "version": "c380b52f6c5702cc4bdda5e6d456d6c19a201a0b",
              "status": "affected",
              "versionType": "git",
              "lessThan": "d7ea8495fd307b58f8867acd81a1b40075b1d3ba"
            },
            {
              "version": "406a037d93b769bca248476bd14bbe548dc1ec35",
              "status": "affected",
              "versionType": "git"
            },
            {
              "version": "6.1.132",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "6.2"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "6.2",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "6.2"
            },
            {
              "version": "6.6.145",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "version": "6.12.96",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "version": "6.18.39",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "version": "7.0.10",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "7.0.*"
            },
            {
              "version": "7.1",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}