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So it's a vulnerability that requires you to.already have been compromised. Hardly seems like news.
I can understand AMD only patching server chips that by definition will be under greater threat. On the other hand it's probably not worth the bad publicity not to fix more.
The reason that this is news is because it allows malware to embed itself into the processor microcode once kernel is breached. IE: If it is exploited for compromise, you either have to have the knowledge and hardware to reset the processor microcode manually (Requires an SPI flash tool) or you toss the hardware entirely. There's no just 'blow the drive away and reinstall the OS' solution available.
I don’t think it gets to the microcode but the UEFI.