CVE-2026-63833
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]
How to fix
- linux linux_kernel5.15.211, 6.1.177, 6.6.144, 6.12.95, 6.18.38, 7.1.3 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | 5.15 ≤ v < 5.15.211, 5.16 ≤ v < 6.1.177, 6.2 ≤ v < 6.6.144, 6.7 ≤ v < 6.12.95, 6.13 ≤ v < 6.18.38, 6.19 ≤ v < 7.1.3 | 5.15.211, 6.1.177, 6.6.144, 6.12.95, 6.18.38, 7.1.3 |
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