Samba 4.22.2 has been released and is the most recent stable release within the Samba 4.22 series, which includes a security-related bug fix identified as CVE-2025-0620. This update addresses an issue in which Samba fails to recognize changes in group membership during the reauthentication of an expired SMB session. This issue arises when Samba retains a cache of associations between a user's impersonation details and connected shares. The update impacts users who remove an individual from a group in Active Directory, resulting in the change not taking effect until the user disconnects from the server and initiates a new connection. The release also addresses additional issues, including profile synchronization failures related to directory leases, failures in net ad join, dcerpcd not binding to the listening port, and CTDB not placing nodes running NFS into grace during a graceful shutdown.
Samba 4.22.2 Available for Download
This is the latest stable release of the Samba 4.22 release series. It contains the security-relevant bugfix CVE-2025-0620:
smbd doesn't pick up group membership changes
when re-authenticating an expired SMB session
https://www.samba.org/samba/security/CVE-2025-0620.html
Description of CVE-2025-0620
With Kerberos authentication SMB sessions typically have an associated lifetime, requiring re-authentication by the client when the session expires. As part of the re-authentication, Samba receives the current group membership information and is expected to reflect this change in further SMB request processing.
For historic reasons, Samba maintains a cache of associations between a user's impersonation information and connected shares. A recent change in this cache caused Samba to not reflect group membership changes from session re-authentication when processing further SMB requests.
As a result, when an administrator removes a user from a particular group in Active Directory, this change will not become effective unless the user disconnects from the server and establishes a new connection.
Changes since 4.22.1
o Ralph Boehme [slow@samba.org]
* BUG 15707: (CVE-2025-0620) [SECURITY] CVE-2025-0620: smbd doesn't pick up group membership changes when re-authenticating an expired SMB session.
* BUG 15861: Profile sync fails due to Directory Leases.
o Pavel Filipenský [pfilipensky@samba.org]
* BUG 15727: net ad join fails with "Failed to join domain: failed to create kerberos keytab".
o Stefan Metzmacher [metze@samba.org]
* BUG 15851: dcerpcd not able to bind to listening port.
o Anoop C S [anoopcs@samba.org]
* BUG 15819: vfs_ceph_snapshots fails to list snapshots for entries at any level beyond share root.
o Martin Schwenke [mschwenke@ddn.com]
* BUG 15858: CTDB does not put nodes running NFS into grace on graceful shutdown.
Reporting bugs & Development Discussion
Please discuss this release on the samba-technical mailing list or by joining the #samba-technical:matrix.org matrix room, or #samba-technical IRC channel on irc.libera.chat.
If you do report problems then please try to send high quality feedback. If you don't provide vital information to help us track down the problem then you will probably be ignored. All bug reports should be filed under the Samba 4.1 and newer product in the project's Bugzilla database ( https://bugzilla.samba.org/).
Download Details
The uncompressed tarballs and patch files have been signed using GnuPG (ID AA99442FB680B620). The source code can be downloaded from:
https://download.samba.org/pub/samba/stable/
The release notes are available online at:
https://www.samba.org/samba/history/samba-4.22.2.html
Our Code, Our Bugs, Our Responsibility.
( https://bugzilla.samba.org/)
--Enjoy
The Samba Team
