Recently, there is a new vulnerabilities which announce in runc (an popular container platforms called Docker & Kubernetes).
How the Vulnerability work?
The attacker can use an exploit in a bug within runc to get access privileges of root on the Operating System that runs the container. As a result, the attacker can gain an unlimited access as root to the server. However, this vulnerabilities will not work if all the security practice (SELinux) is in place.
For more details on this vulnerabilities, you can read the article here