{
  "cveId": "CVE-2026-63833",
  "url": "https://patchblox.com/security/cve/CVE-2026-63833",
  "summary": "CVE-2026-63833 is fixed in 56 products on 1 platform, first by ALAS2023-2026-1969, released July 20, 2026. It is not reported as exploited. Patch Radar priority: Urgent.",
  "title": "ntfs3: reject direct userspace writes to reserved $LX* xattrs",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  ntfs3: reject direct userspace writes to reserved $LX* xattrs  NTFS3 uses $LXUID, $LXGID, $LXMOD and $LXDEV as internal WSL permission metadata and reloads them into i_uid, i_gid and i_mode from ntfs_get_wsl_perm().  Because the empty-prefix xattr handler also lets file owners call setxattr() on these names directly, an unprivileged writer on a writable ntfs3 mount can plant root ownership and S_ISUID on their own file and gain euid 0 after inode reload.  Reject direct userspace writes to the reserved $LX* names. Internal ntfs3 metadata updates are unchanged because ntfs_save_wsl_perm() writes them via ntfs_set_ea() directly.  [almaz.alexandrovich@paragon-software.com: added an additional check for non privileged users]",
  "published": "2026-07-19T12:16:56Z",
  "severity": "Critical",
  "cvss": 9.8,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
  "epss": 0.00144,
  "epssPercentile": 0.03734,
  "priority": "Urgent",
  "priorityTier": 2,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-63833",
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      "product": "python3-perf6.12-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.12.95-124.187.amzn2023",
      "fix": "ALAS2023-2026-2014",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2014",
      "released": "2026-08-03T09:00:00Z"
    },
    {
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      "product": "python3-perf6.18",
      "release": "amzn 2023",
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      "fix": "ALAS2023-2026-1969",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1969",
      "released": "2026-07-20T09:00:00Z"
    },
    {
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      "release": "amzn 2023",
      "fixedVersion": "1:6.18.38-73.137.amzn2023",
      "fix": "ALAS2023-2026-1969",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1969",
      "released": "2026-07-20T09:00:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T19:38:12Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}