AMD has published a document warning that Zen 3-based processors may be targeted by side-channel attacks. As per its description, this vulnerability is similar to Spectre, which plagued Intel processors three years ago. AMD Zen 3 core architecture features a new technology that improves performance by predicting the “relationship between loads and stores without waiting for the address calculation to complete”. This technology is called Predictive Store Forwarding (PSF). Most of the time, the prediction is calculated correctly, but occasionally it may not be as accurate as it should. When a bad PSF speculation occurs, Zen 3-based processors can be targeted by side-channel attacks similar to Intel processors affected by Spectre.