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Publishes New Side-Channel Vulnerability in Zen 3 Processors by Jim Turley It’s not a bug, it’s a feature, if you publish it in the manual, right? AMD has taken a “white hat” approach to a possible security risk in its newest Zen 3 processors by publishing a white paper that describes the problem. Although there’s no known exploit in the field, AMD appears to be heading off any problems by detailing how, when, and where the problem might occur, and what you can do about it. Kudos to the company for transparency.  The problem lies in a hidden feature called predi...

AMD has disclosed a potential security vulnerability on its Zen 3 CPUs with similarities to the Spectre attack from several ...

AMD Ryzen Zen 3 processors are suffering from a security vulnerability similar to Spectre seen on Intel processors 3 years ago.

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. Wh...

Again? on April 4, 2021, 10:58 28 comments In brief: AMD has confirmed that a microarchitecture optimization inside Zen 3 CPUs can be exploited in a similar fashion to the Spectre vulnerabilities that plagued Intel CPUs a few generations ago. Disabling the optimization is possible, but will carry a performance penalty that AMD doesn’t believe is worth it for all but the most critical deployments of the processors. In a recently published whitepaper, titled "Security Analysis of AMD Predictive Store Forwarding," AMD describes the nature of the vulnerabili...