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Review reviewHigh

CVE-2026-63833

Linux

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 ntfs...

CVSS
7.1
EPSS
-
- percentile
CISA KEV
Not listed
Published
2026.07.19
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 7.1

Vulnerability overview

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 ntfs...

Affected product and versions

Product
Linux
Affected versions
>= be71b5cba2e6485e8959da7a9f9a44461a1bb074 < e574af95234afc3c725988bbc1fdeb46b9f386a4, >= be71b5cba2e6485e8959da7a9f9a44461a1bb074 < 2c3cd6da4a14380ef79e34bd9dff7caf46687477, >= be71b5cba2e6485e8959da7a9f9a44461a1bb074 < e8852ae29868e449fdb47eebc28f35fb80741a5f, >= be71b5cba2e6485e8959da7a9f9a44461a1bb074 < f8d420949b335a4b51d06ab276beee6b8dfdc909, >= be71b5cba2e6485e8959da7a9f9a44461a1bb074 < 5e658b9245a52d838ef93729a7bc07de8e19deb7, >= be71b5cba2e6485e8959da7a9f9a44461a1bb074 < 293a84fa40b3a1b3471c0545722724bc10973f76, >= be71b5cba2e6485e8959da7a9f9a44461a1bb074 < 5b08dccecf825cbf905f348bc6ccb497507e28e2, >= 5.15
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
CWE
Not available
CVE-2026-63833 — Linux | SECUFOCUS NOW