A serious security flaw has been discovered within 'runc' that could allow a
container breakout and/or root privilege escalation within Docker, LXC,
Kubernetes and many other platforms.

An exploit has already been made public and it is recommended that you
update as soon as possible.

References:

https://seclists.org/oss-sec/2019/q1/119

https://github.com/lxc/lxc/commit/6400238d08cdf1ca20d49bafb85f4e224348bf9d

Regards,
Virtualizor Team.