https://wccftech.com/amd-zen-3-cpu-facing-spectre-like-vulnerabilities/

3 years ago, many of Intel's processors suffered from the Spectre security vulnerability which concerned security experts. Now, AMD's Ryzen Zen 3 processors are suffering from a security vulnerability similar to Spectre as detailed in AMD's whitepaper.

The new technology introduced by AMD on the Zen 3 based Ryzen & EPYC processors, Predictive Store Forwarding (PSF), has opened up security vulnerabilities. PSF functions by predicting the relationship between loads and stores which improves code execution performance. For the most part, the predictions are correct, but in the case of an incorrect prediction, the result is incorrect CPU speculation.