{
  "cveId": "CVE-2026-90199",
  "url": "https://patchblox.com/security/cve/CVE-2026-90199",
  "summary": "CVE-2026-90199 is fixed in 39 products on 1 platform, first by DEBIAN-CVE-2026-90199, released September 23, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  fs/ntfs3: reject out-of-range evcn in mi_enum_at...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  fs/ntfs3: reject out-of-range evcn in mi_enum_attr()  In mi_enum_attr(), the start/end VCN validation for non-resident attributes is:  \tif (svcn \u003E evcn \u002B 1) goto out;  When evcn is U64_MAX the \u0022evcn \u002B 1\u0022 expression wraps to 0 and any svcn passes the check. For evcn values close to U64_MAX (but not equal to it) the right-hand side is still a meaningless near-wrap upper bound, so a malformed on-disk attribute with svcn == 0 and evcn near U64_MAX can pass mi_enum_attr() unrejected.  VCN (virtual cluster number) is a cluster index, so any valid evcn is bounded by the volume\u0027s total cluster count, which ntfs3 holds in sbi-\u003Eused.bitmap.nbits (set up in ntfs_init_from_boot() before any caller of mi_enum_attr() runs). Reject evcn values that fall outside this range.  However, an empty non-resident attribute (no allocated clusters) is legitimately encoded with svcn == 0 and evcn == -1 (U64_MAX), e.g. via attr-\u003Enres.evcn = cpu_to_le64((u64)vcn - 1) with vcn == 0. That sentinel must keep passing, so exclude evcn == U64_MAX from the range check. The existing \u0022svcn \u003E evcn \u002B 1\u0022 test still tolerates the sentinel (\u00220 \u003E 0\u0022 is false) and continues to require svcn == 0 for it, while the range check rejects every other out-of-range evcn and thereby also defuses the \u0022evcn \u002B 1\u0022 wraparound.  svcn does not need its own bound: once evcn \u003C nbits, \u0022svcn \u003E evcn \u002B 1\u0022 implies svcn \u003C= nbits.  [almaz.alexandrovich@paragon-software.com: fixed evcn check]",
  "published": "2026-09-17T17:17:14Z",
  "severity": "high",
  "cvss": 7.8,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
  "epss": 0.00174,
  "epssPercentile": 0.0688,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
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      "product": "bpftool6.12",
      "release": "amzn 2023",
      "fixedVersion": "1:6.12.110-135.201.amzn2023",
      "fix": "ALAS2023-2026-3196",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3196",
      "released": "2026-11-07T01:06:07Z"
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      "fix": "ALAS2023-2026-3192",
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  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}