Updated samba packages fix security vulnerabilities:
A combination of parameters and permissions in smb.conf can allow user to escape from the share path definition (CVE-2019-10197).
An authenticated user can crash the Samba AD DC's RPC server process via a NULL pointer dereference (CVE-2019-12435)
An user with read access to the directory can cause a NULL pointer dereference using the paged search control (CVE-2019-12436).
For other fixes in this update, see the referenced changelogs.