AMD CPUs: SinkClose

[madires]

CVE-2023-31315:
- New AMD SinkClose flaw helps install nearly undetectable malware (https://www.bleepingcomputer.com/news/security/new-amd-sinkclose-flaw-helps-install-nearly-undetectable-malware/)
- ‘Sinkclose’ Flaw in Hundreds of Millions of AMD Chips Allows Deep, Virtually Unfixable Infections (https://www.wired.com/story/amd-chip-sinkclose-flaw/)
- AMD's Security Bulletin: Guest Memory Vulnerabilities (https://www.amd.com/en/resources/product-security/bulletin/amd-sb-7014.html, list of affected CPUs)

[Ranayna]

Yeah, thats an ugly one.

A bit related, i stumbled over this one when i was looking for UEFI Updates for my MSI board:

Another SMM related security flaw with Mainboards by MSI. Affecting both Intel and AMD Boards.
https://jjensn.com/at-home-in-your-firmware/

Fixes are available for that one.
For SinkClose we will likely have to wait a bit for updated UEFI versions.