CVE-2026-64388
In the Linux kernel, the following vulnerability has been resolved: smb/client: fix chown/chgrp with SMB3 POSIX Extensions Ownership (chown) and group (chgrp) modifications were being ignored when mounting with SMB3 POSIX Extensions unless CIFS_MOUNT_CIFS_ACL or CIFS_MOUNT_MODE_FROM_SID were also explicitly set. Fix this by checking for posix_extensions in cifs_setattr_nounix() when updating UID and GID, ensuring that id_mode_to_cifs_acl() is called to map and set the ownership/group information on the server.
- Score
- CVSS 3.1 7.8 High
- Status
- Modified - 416baaa9-dc9f-4396-8d5f-8c081fb06d67
- Published
- 2026-07-25
- Last modified
- 2026-10-21
- Weaknesses
- CWE-682
Affected products
References
- https://git.kernel.org/stable/c/6825a45f6b8ef76b0ee32649ec3d6e39ca143a18
- https://git.kernel.org/stable/c/27ead8c5418af6bfab711079fecb9414d78d4cae
- https://git.kernel.org/stable/c/3eaec47518e126e6dcd1a48521d740278073f0ec
- https://git.kernel.org/stable/c/550cfb8a81181331d4d0f76ab75ee58a0bf41e3e
- https://git.kernel.org/stable/c/760ef2c579c2609cf17fb1cd5392f64d42d43d33
