The AMD EPYC Server processor chips have insufficient access control for protected memory regions, aka FALLOUT-1, FALLOUT-2, and FALLOUT-3.
amdflaws.com/
blog.trailofbits.com/2018/03/15/amd-flaws-technical-summary/
community.amd.com/community/amd-corporate/blog/2018/03/21/initial-amd-technical-assessment-of-cts-labs-research
safefirmware.com/amdflaws_whitepaper.pdf
support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03841en_us