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Everyone always says this, and I know security isn't a #1 priority and that it'd be a big mistake to assume Docker is secure -- but, are there any known security issues with Docker that could give sudo access to the host machine? Anything beyond the standard: "Don't trust it because its almost certainly not secure."

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The issue, as another poster pointed out, is not that there are vulnerabilities in the Docker daemon, but that access to the socket inherently gives you access to run arbitrary containers in privileged mode. This allows you access to the full host: https://docs.docker.com/engine/reference/run/#/runtime-privi... and everything that a normal root user can do.

At present, there is no great way to mitigate this if you're tracking the official Docker releases (at least, as far as I know).

Yes, you can run a privileged container that bind-mounts / on the host into the container. root.

I presume that the default selinux policy in redhat7 would stop this.

But that would mean using the docker version in redhat7, which tends to trail behind a little.

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