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CVE-2026-63833

7.1 · HIGH

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 perm…

Published Jul 19, 2026EPSS 0.13%

Overview

CVE-2026-63833 is a high-severity vulnerability. It was published on July 19, 2026 and has a CVSS 3.1 base score of 7.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.1, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical 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]

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/293a84fa40b3a1b3471c0545722724bc10973f76Refgit.kernel.org/stable/c/2c3cd6da4a14380ef79e34bd9dff7caf46687477Refgit.kernel.org/stable/c/5b08dccecf825cbf905f348bc6ccb497507e28e2Refgit.kernel.org/stable/c/5e658b9245a52d838ef93729a7bc07de8e19deb7Refgit.kernel.org/stable/c/e574af95234afc3c725988bbc1fdeb46b9f386a4Refgit.kernel.org/stable/c/e8852ae29868e449fdb47eebc28f35fb80741a5fRefgit.kernel.org/stable/c/f8d420949b335a4b51d06ab276beee6b8dfdc909

How CyberStrike helps

Frequently asked questions

What is CVE-2026-63833?

CVE-2026-63833 is a high-severity vulnerability. It was published on July 19, 2026 and has a CVSS 3.1 base score of 7.1 (HIGH).

How severe is CVE-2026-63833?

This vulnerability has a CVSS 3.1 base score of 7.1, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-63833?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-63833?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-63833 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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