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AMD Details Potential Ryzen Attack Vector

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 predictive store forwarding (PSF). It’s a performance enhancement first introduced in Zen 3 chips (i.e., those Ryzen 5900X and 5950X CPUs that are impossible to buy right now) that speculatively feeds data to the processor before it’s actually available. The concept is not entirely novel in the CPU world, but it’s the first time AMD has implemented it in this particular way, and it comes with

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AMD upozornila na chybu v CPU Zen 3, může vést k útoku Spectre V4 (Speculative Store Bypass)

AMD upozornila na chybu v CPU Zen 3, může vést k útoku Spectre V4 (Speculative Store Bypass)
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AMD Discloses a Spectre-Like Vulnerability in Zen 3 CPUs

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

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The Predictive Store Forwarding Software On AMD Zen 3 Processors Creates Security Vulnerabilities

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

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AMD Zen 3 processors vulnerable to Spectre-like exploits

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.

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