New Zenbleed Vulnerability: What It Is, How to Fix It

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Zenbleed (CVE-2023-20593) was announced today. This is a vulnerability affecting AMD processors based on the Zen2 microarchitecture (certain EPYC CPUs used in datacenter servers and Ryzen/Threadripper CPUs used in desktop/laptop computers). The bug is a speculative execution bug, but somewhat different from the speculative execution side channel bugs we’ve seen ... Read More