CVE-2026-63833

Last refreshed2026-10-17

Status: UPDATED | Advisory ID: CVE-2026-63833

Key Details

CVE	CVE-2026-63833
CVSS Score / Version	7.1 (High) / CVSS v3.1
Updated	2026-10-16
CVSS Vector	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N`
CVSS Prose	attack vector is local; attack complexity is low; privileges required is low; user interaction is none; scope is unchanged; confidentiality impact is high; integrity impact is high; availability impact is none.
Affected products	Linux Kernel

Vendor	Product	Affected Versions	Patch Status
Linux	Linux Kernel

Vendor

Product

Affected Versions

Patch Status

Linux

Linux Kernel

Subsystems	OT Supporting Infrastructure
Sectors	All Sectors

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] (NVD)

Monitor Linux's web page for any future patch releases.

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-63833
CVE	https://www.cve.org/CVERecord?id=CVE-2026-63833

Source

Reference

NVD

CVE