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AMD does not believe the PortSmash issue ( is related to previously found speculative execution issues like Spectre.  Instead, AMD believes the issues are related to any processor that uses simultaneous multithreading (SMT), including those from AMD, that is vulnerable to software that exposes the activity of one process to another running on the same processor. We believe this issue can be mitigated in software by using side-channel counter measures. For example, OpenSSL, which was used in the researcher’s proof of concept, has already been updated to address this type of attack.