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New UEFI vulnerabilities send firmware devs industry wide scrambling
(arstechnica.com)
This is a most excellent place for technology news and articles.
I am pretty sure TianoCore is also used by AMD systems as a reference as well.
Here's a similar situation that happened in 2019 at Lenovo's site
https://support.lenovo.com/cl/es/solutions/LEN-22660
AMD systems are listed as well.
As for most board vendors nowadays, I think they barely do anything with the code itself and just create the setup utility and boot logos. It is highly likely that they're affected too.