{
  "cveId": "CVE-2026-90117",
  "url": "https://patchblox.com/security/cve/CVE-2026-90117",
  "summary": "CVE-2026-90117 is fixed in linux on 1 platform by DEBIAN-CVE-2026-90117 (version 7.2.6-1), released September 23, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  ntfs: validate usa_ofs before preserving the upd...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  ntfs: validate usa_ofs before preserving the update sequence number  When ntfs_mft_record_alloc() reuses a free mft record it reads the old update sequence number straight from the on-disk record:       usn = *(__le16 *)((u8 *)m \u002B le16_to_cpu(m-\u003Eusa_ofs));  Here m points into the raw $MFT page-cache folio, which still holds unvalidated, MST-protected bytes: the folio is read by a plain iomap_read_folio() and neither post_read_mst_fixup() nor ntfs_mft_record_check() has run on it (both work on private copies). m-\u003Eusa_ofs is therefore an untrusted u16, and a corrupted record can put it past the end of the record so the two-byte read lands outside the folio.  Reading such a record while creating a file gives, under KASAN:     BUG: KASAN: use-after-free in ntfs_mft_record_alloc\u002B...    Read of size 2 at addr ...     ntfs_mft_record_alloc -\u003E __ntfs_create -\u003E ntfs_create -\u003E path_openat  Only preserve the old update sequence number when usa_ofs is even and in range, mirroring the check ntfs_mft_record_check() already applies; otherwise leave usn zero, which the existing restore below skips.",
  "published": "2026-09-17T17:17:03Z",
  "severity": "",
  "epss": 0.00198,
  "epssPercentile": 0.09553,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.2.6-1",
      "fix": "DEBIAN-CVE-2026-90117",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-90117",
      "released": "2026-09-23T19:19:02Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T19:12:23Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}