CVE-2026-63833 Details
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. [[email protected]: added an additional check for non privileged users]
A vulnerability in the Linux kernel's NTFS3 file system implementation allows unprivileged users to write to reserved extended attribute names that are used for internal Windows Subsystem for Linux (WSL) permission metadata. This vulnerability is present in the Linux kernel NTFS3 component, specifically through a combination of the empty-prefix extended attribute handler and writable NTFS3 mounts. When a file owner writes to these reserved attributes, it can result in planting root ownership and the set-user-ID (S_ISUID) attribute on their own files. After the inode is reloaded, this manipulation grants them elevated privileges, effectively allowing them to execute commands as the root user.
The vulnerability has been addressed in the Linux kernel by rejecting direct user writes to the reserved $LX extended attributes. Users should update to the latest version of the Linux kernel where this fix has been applied.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
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Weakness Enumeration
No weakness enumeration is available for this CVE.
Affected Products
No affected product data is available for this CVE.
Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Aug 17, 2026 | CVE Modified | kernel.org |
| Jul 20, 2026 | CVE Modified | kernel.org |
| Jul 20, 2026 | CVE Modified | kernel.org |
| Jul 19, 2026 | New CVE Received | kernel.org |