CVE-2026-63833

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2026-63833
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]

7.1 /10

CVSS v3 : HIGH

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 5.2

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

References
Link Resource
https://git.kernel.org/stable/c/293a84fa40b3a1b3471c0545722724bc10973f76 Patch
https://git.kernel.org/stable/c/2c3cd6da4a14380ef79e34bd9dff7caf46687477 Patch
https://git.kernel.org/stable/c/5b08dccecf825cbf905f348bc6ccb497507e28e2 Patch
https://git.kernel.org/stable/c/5e658b9245a52d838ef93729a7bc07de8e19deb7 Patch
https://git.kernel.org/stable/c/e574af95234afc3c725988bbc1fdeb46b9f386a4 Patch
https://git.kernel.org/stable/c/e8852ae29868e449fdb47eebc28f35fb80741a5f Patch
https://git.kernel.org/stable/c/f8d420949b335a4b51d06ab276beee6b8dfdc909 Patch
Configurations

Configuration 1 (hide)

OR cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
History

22 Oct 2026, 14:11

Type Values Removed Values Added
First Time Linux linux Kernel
Linux
CPE cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
References () https://git.kernel.org/stable/c/293a84fa40b3a1b3471c0545722724bc10973f76 - () https://git.kernel.org/stable/c/293a84fa40b3a1b3471c0545722724bc10973f76 - Patch
References () https://git.kernel.org/stable/c/2c3cd6da4a14380ef79e34bd9dff7caf46687477 - () https://git.kernel.org/stable/c/2c3cd6da4a14380ef79e34bd9dff7caf46687477 - Patch
References () https://git.kernel.org/stable/c/5b08dccecf825cbf905f348bc6ccb497507e28e2 - () https://git.kernel.org/stable/c/5b08dccecf825cbf905f348bc6ccb497507e28e2 - Patch
References () https://git.kernel.org/stable/c/5e658b9245a52d838ef93729a7bc07de8e19deb7 - () https://git.kernel.org/stable/c/5e658b9245a52d838ef93729a7bc07de8e19deb7 - Patch
References () https://git.kernel.org/stable/c/e574af95234afc3c725988bbc1fdeb46b9f386a4 - () https://git.kernel.org/stable/c/e574af95234afc3c725988bbc1fdeb46b9f386a4 - Patch
References () https://git.kernel.org/stable/c/e8852ae29868e449fdb47eebc28f35fb80741a5f - () https://git.kernel.org/stable/c/e8852ae29868e449fdb47eebc28f35fb80741a5f - Patch
References () https://git.kernel.org/stable/c/f8d420949b335a4b51d06ab276beee6b8dfdc909 - () https://git.kernel.org/stable/c/f8d420949b335a4b51d06ab276beee6b8dfdc909 - Patch

19 Oct 2026, 20:19

Type Values Removed Values Added
CWE CWE-862
Information

Published : 2026-07-19 12:16

Updated : 2026-10-22 14:11

NVD link : CVE-2026-63833

Mitre link : CVE-2026-63833

CVE.ORG link : CVE-2026-63833

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
CWE-862

Missing Authorization