Why do you say that? Go's data races can produce memory corruption through bounds checking failures. I'm not aware of Java having that kind of memory corruption.

Yes. Java and C# are unsafe by the same standard. Last I checked, they both allow multiple threads to nonatomically modify a raw variable - which can lead to data races and data corruption.

I haven't heard of anyone getting RCE out of this class of bug in C# or java though.

JVM semantics[1] don't allow this to corrupt program state arbitrarily, just the data variables in question, right? Whereas in Go.. Search for "corruption" in https://research.swtch.com/gomm

[1] Not just Java, meaning all the many nice JVM languages enjoy this is as well, eg Clojure, Scala etc

It's common to exploit JavaScript engines with this kind of bug, and JS engines probably have better security teams at this point, so I expect you could get an RCE if you really tried.

Yes, but those would be bugs in the runtime itself, rather than in the programming language. Java and JavaScript both define behavior of racy code; Go does not.