Very interesting talk of multiple vulnerabilities found in FreeBSD jails. Kinda fun that FreeBSD groupies always cite jails as the big FreeBSD point when the researchers have not found 1 or 2 vulns, but 40 ! IMHO that shows that when code is not so used and maintained, you're exposed to that. It looks like the chicken and egg problem: if your project doesn't bring that much interest, you don't have people taking care of the code, making people not using the project...
https://media.ccc.de/v/39c3-escaping-containment-a-security-analysis-of-freebsd-jails