High severity7.8NVD Advisory· Published Jul 25, 2026· Updated Oct 21, 2026
CVE-2026-64388
CVE-2026-64388
Description
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.
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Affected products
4- osv-coords2 versions
>= 4.18.0, < 6.6.160+ 1 more
- (no CPE)range: >= 4.18.0, < 6.6.160
- (no CPE)range: < 7.1.7-1.1
Patches
Vulnerability mechanics
References
5- git.kernel.org/stable/c/550cfb8a81181331d4d0f76ab75ee58a0bf41e3envdPatch
- git.kernel.org/stable/c/760ef2c579c2609cf17fb1cd5392f64d42d43d33nvdPatch
- git.kernel.org/stable/c/27ead8c5418af6bfab711079fecb9414d78d4caenvd
- git.kernel.org/stable/c/3eaec47518e126e6dcd1a48521d740278073f0ecnvd
- git.kernel.org/stable/c/6825a45f6b8ef76b0ee32649ec3d6e39ca143a18nvd
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