A critical vulnerability has been discovered in, the popular init system and service manager for Linux operating systems. Remote attackers can potentially trigger a buffer overflow to execute malicious code on the targeted machines via a DNS response. The bug is present in Ubuntu versions 17.04 and 16.10; Debian versions Stretch, Buster (aka 10) and Sid (aka Unstable); and various other Linux distributions that use Systemd. Security patches have been rolled out to address the issue, so users and system administrators are strongly recommended to install them and update their Linux distros as soon as possible.
Source: https://thehackernews.com/2017/06/linux-buffer-overflow-code.html