CVE-2026-63833 (GCVE-0-2026-63833)
Vulnerability from cvelistv5
Published
2026-07-19 12:02
Modified
2026-10-19 20:07
Severity ?
7.1 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Summary
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]
References
Impacted products
Vendor Product Version
Linux Linux Version: be71b5cba2e6485e8959da7a9f9a44461a1bb074
Version: be71b5cba2e6485e8959da7a9f9a44461a1bb074
Version: be71b5cba2e6485e8959da7a9f9a44461a1bb074
Version: be71b5cba2e6485e8959da7a9f9a44461a1bb074
Version: be71b5cba2e6485e8959da7a9f9a44461a1bb074
Version: be71b5cba2e6485e8959da7a9f9a44461a1bb074
Version: be71b5cba2e6485e8959da7a9f9a44461a1bb074
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