Security Advisory

CVE-2026-64388

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-07-25 08:50:36

Last updated 2026-07-25 08:50:36

Assigner Linux

CVSS score not scored

State PUBLISHED

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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