this post was submitted on 26 Aug 2023
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The last update for Zen 3, Zen 3+, Zen 4 was 08/08/2023 and the last update for Zen, Zen+, Zen 2 was 19/07/2023.
For reference, Intel also last updated theirs 08/08/2023.
Yes you can argue that we don't explicitly know what CPUs in those families were updated, but I don't really care.
We know, here's the list, it's pretty poor, AMD don't release often its microcode, and when they do it's only for a few select CPUs
https://salsa.debian.org/hmh/amd64-microcode/-/blob/main/amd-ucode/README
If you are lucky, someone will extract its microcode from his BIOS and put it there:
https://github.com/platomav/CPUMicrocodes/tree/master/AMD