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The OP says they discovered this on a Zen 2, which is not covered by that bulletin (?)

[edit to add]: Also, the bulletin is solely about RDSEED zeros, whereas the OP is also reporting RDRAND zeroes.

Older AMD processors had issues as well:

https://github.com/systemd/systemd/pull/12536/commits/1c53d4...

That one's insidious!

I found the thread about it,

https://news.ycombinator.com/item?id=19848953

Yikes at this: "I am so glad I resisted pressure from engineers working at Intel to let /dev/random in Linux rely blindly on the output of the RDRAND instructure." -Theodore Ts'o (2013)

Why does systemd use architecture-specific instructions rather than using the kernel-provided random interface in the first place?

It was removed later https://github.com/systemd/systemd/commit/ffa047a03e4c5f6bd3...

Reply on news.ycombinator.com