this post was submitted on 08 Aug 2023
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AMD has kicked off a busy Patch Tuesday by disclosing INCEPTION, a new speculative side channel attack affecting Zen 3 and Zen 4 processors.AMD-SB-7005 "Return Address Security Bulletin" outlines this new speculative side channel attack affecting recent EPYC and Ryzen processors.
AMD believes ‘Inception’ is only potentially exploitable locally, such as via downloaded malware, and recommends customers employ security best practices, including running up-to-date software and malware detection tools.
AMD is not aware of any exploit of ‘Inception’ outside the research environment, at this time.
No µcode patch or BIOS update is necessary for products based on “Zen” or “Zen 2” CPU architectures because these architectures are already designed to flush branch type predictions from the branch predictor.
Please refer to your OEM, ODM or motherboard manufacturer for a BIOS update specific to your product.