CVE-2026-63833
Vulnerability 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.
[almaz.alexandrovich@paragon-software.com: added an additional check for non privileged users]
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]
Vulnerability Details
Published Date
Last Modified
Source
NVD
Vendor
Linux
Product
Linux
External References
- https://git.kernel.org/stable/c/293a84fa40b3a1b3471c0545722724bc10973f76
- https://git.kernel.org/stable/c/2c3cd6da4a14380ef79e34bd9dff7caf46687477
- https://git.kernel.org/stable/c/5b08dccecf825cbf905f348bc6ccb497507e28e2
- https://git.kernel.org/stable/c/5e658b9245a52d838ef93729a7bc07de8e19deb7
- https://git.kernel.org/stable/c/e574af95234afc3c725988bbc1fdeb46b9f386a4
- https://git.kernel.org/stable/c/e8852ae29868e449fdb47eebc28f35fb80741a5f
- https://git.kernel.org/stable/c/f8d420949b335a4b51d06ab276beee6b8dfdc909
Discussion (0)
Add Comment
No comments yet. Be the first!