AMD's Ryzen, Epyc security co-processor and chipset have major flaws, researchers claim It's unknown whether the potential attacks on AMD's Ryzen, with names like Ryzenfall, Masterkey, and Fallout, will prove to be significant.
https://www.pcworld.com/article/3262967/security/amds-ryzen-epyc-security-co-processor-and-chipset-have-major-flaws-researchers-claim.html

Researchers say they’ve discovered serious potential vulnerabilities within AMD’s Ryzen and Epyc chip architectures. AMD said it’s taking the reports seriously, though it wasn’t provided sufficient time to investigate or confirm them before their disclosure. CTS-Labs, a security research company which says it specializes in vulnerabilities within ASICs and other chips, has said it’s discovered four potential attacks, code-named Masterkey, Ryzenfall, Fallout, and Chimera. All would require a program running with local access and administrator privileges to exploit them. AMD confirmed it’s been made aware of the potential vulnerabilities. However, the statement AMD provided to PCWorld implied that the company wasn’t given the usual amount of time to investigate the vulnerabilities internally, which is typically about 90 days....

Links
https://www.pcworld.com/article/3262967/security/amds-ryzen-epyc-security-co-processor-and-chipset-have-major-flaws-researchers-claim.html
https://www.cnet.com/news/amd-has-a-spectre-meltdown-like-security-flaw-of-its-own/
https://thehackernews.com/2018/03/amd-processor-vulnerabilities.html
https://hothardware.com/news/amd-processors-and-chipsets-ryzenfall-chimera-fallout-security-flaws
https://wccftech.com/report-alleges-amd-ryzen-epyc-cpus-suffer-13-fatal-security-flaws/