{
  "cveId": "CVE-2026-53027",
  "url": "https://patchblox.com/security/cve/CVE-2026-53027",
  "summary": "CVE-2026-53027 is fixed in 39 products on 1 platform, first by DEBIAN-CVE-2026-53027, released June 25, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "fs/ntfs3: fix missing run load for vcn0 in attr_data_get_block_locked()",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  fs/ntfs3: fix missing run load for vcn0 in attr_data_get_block_locked()  When a compressed or sparse attribute has its clusters frame-aligned, vcn is rounded down to the frame start using cmask, which can result in vcn != vcn0. In this case, vcn and vcn0 may reside in different attribute segments.  The code already handles the case where vcn is in a different segment by loading its runs before allocation. However, it fails to load runs for vcn0 when vcn0 resides in a different segment than vcn. This causes run_lookup_entry() to return SPARSE_LCN for vcn0 since its segment was never loaded into the in-memory run list, triggering the WARN_ON(1).  Fix this by adding a missing check for vcn0 after the existing vcn segment check. If vcn0 falls outside the current segment range [svcn, evcn1), find and load the attribute segment containing vcn0 before performing the run lookup.  The following scenario triggers the bug:   attr_data_get_block_locked()     vcn = vcn0 \u0026 cmask        \u003C- vcn != vcn0 after frame alignment     load runs for vcn segment \u003C- vcn0 segment not loaded!     attr_allocate_clusters()  \u003C- allocation succeeds     run_lookup_entry(vcn0)    \u003C- vcn0 not in run -\u003E SPARSE_LCN     WARN_ON(1)                \u003C- bug fires here!",
  "published": "2026-06-24T17:17:14Z",
  "severity": "Important",
  "cvss": 7.1,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00123,
  "epssPercentile": 0.02025,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-53027",
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  "noFixYet": [],
  "dataAsOf": "2026-11-10T01:44:33Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
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}