News AMD APUs Affected by SMM Callout Privilege Escalation Security Vulnerability

so 4xxxU, 4xxxH, are ok?
It's not clear, but with the latest AGESA all AMD Zen and later CPUs should be fine. Which firmware first contained the fix? I don't know, at least not without digging for further details. I assume quite a few 300-series chipset motherboards are still going to be limited to older firmware, but this isn't a massive problem anyway since it requires administrative (and?) or physical access to the system. If that has happened, you should already assume the PC is compromised.
 
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