That was a runc vuln, which affected other conatinerization solutions on Linux, not just docker. Also it didn't really have anything to do with the Docker daem

That was a runc vuln, which affected other conatinerization solutions on Linux, not just docker. Also it didn't really have anything to do with the Docker daemon running as root, it was triggered by the use of root users in containers (blocked if the user didn't do that, had decent SELinux setups or used user namespaces)