CVE-2015-0240 is a security flaw in the smbd file server daemon. It can be exploited by a malicious Samba client, by sending specially-crafted packets to the Samba server. No authenticated is required to exploit this flaw. It can result in remotely controlled execution of arbitrary code as root.
more info: https://securityblog.redhat.com/2015/02/23/samba-vulnerability-cve-2015-0240/