Samba is an open source implementation of the SMB/CIFS network file sharing protocol that works on the majority of operating systems available today. The bug can be exploited by hackers to potentially execute code remotely with root privileges. Samba development team has fixed the flaw in the new Samba version, Samba 4.1.17, which is available to download. Red Hat Enterprise Linux versions 5 through 7 are affected, as are Red Hat Storage Server versions 2.1 and 3.1.
Source: https://thehackernews.com/2015/02/samba-service-hit-by-remote-code.html