On Wednesday, the Samba Team patched a vulnerability that exists in all versions of Samba including and after version 3.5.0. Exploitation of this vulnerability could result in remote code execution on the affected host.
Samba is used to provide SMB and CIFS services for Linux systems, and is pervasive in both enterprise and consumer products. While the Samba Team is providing patches for the latest versions (4.4.x and higher), some Linux vendors, such as RedHat and Ubuntu, are providing patches for older versions of Samba if they are used in a supported version of the OS. The Samba Team may also release patches for older versions of Samba.