Note: Every mainstream OS since RHEL8 has defaulted to User Namespace being turned on. Debian, Fedora, Ubuntu, RHEL, Centos ... all have this defaulted on. Whil

Note: Every mainstream OS since RHEL8 has defaulted to User Namespace being turned on. Debian, Fedora, Ubuntu, RHEL, Centos ... all have this defaulted on. While overall the statements are true. There has not been many recent vulnerabilities forcing distributions to reconsider this setting. Podman is taking advantage of something that is turned on on most of the Linux systems running in the world. So saying this is not well tested on novel is a big exageration. User Namespaces have been available for almost 10 years and enabled for rootless users for at least 5 years in main line distributions.