It did not have serious memory bugs. All of the unsafe code in Redox, of which only a small fraction is unsafe, is neatly compartmentalized so that it's easy to audit.
It was a year ago: https://gitlab.redox-os.org/redox-os/redox/issues/1136
https://gitlab.redox-os.org/redox-os/redox/issues/681
And we're talking about a bunch of people randomly clicking / trying things, so imagine what's really inside Redox.
- Redox is built in Rust and had serious memory bugs triggered by userspace applications, people claim that we should build OS in Rust because it's "memory" safe, in reality it's much more complex than that