https://www.theregister.co.uk/2017/01/24/systemd_flaw/
"Newer" versions of systemd deployed by Fedora or Ubuntu have been secured, but Debian systems are still running an older version and therefore need updating.
systemd is a suite for building blocks for Linux systems that provides system and service management technology. Security specialists view it with suspicion and ***>>>complaints about function creep are not uncommon<<<***.
https://betanews.com/2016/10/07/systemd-vulnerability-linux-crash/
The reason he has decided to disclose the bug publicly was to bring further attention to problems with a widely used component in Linux called systemd that Ayer believes is "defective by design".
However, others believe disclosing such a bug without first contacting systemd's developers is irresponsible. Ayer was critical of systemd for being overly complex and made the argument that Linux developers have "fallen behind other operating systems in writing secure and robust software".