AMD: Microcode Signature Verification Vulnerability

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The recently identified vulnerability in AMD processors, specifically in their Milan and Genoa CPUs, allows an adversary with local administrator privileges to load malicious microcode patches. This has raised concerns about the integrity of microcode updates, especially since AMD has ceased providing microcode updates for consumer platforms through linux-firmware. Users are questioning the security of cloud services that utilize these processors, particularly how cloud providers can guarantee the implementation of legitimate microcode fixes. A significant point of discussion is the potential for this vulnerability to enable custom microcode loading, which could facilitate reverse engineering efforts but also poses serious security risks.
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