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They used a Raspberry Pi Pico to fake additional RAM, and exfiltrated secrets from it.
They call the attack BadRAM.
In response, AMD released a security advisory, and is now tracking the flaw as CVE-2024-21944.
It has gotten a severity score of 5.4 (medium).
It recommends utilizing memory modules that lock SPD, as well as following physical security best practices.
like refer to your OEM for the BIOS update specific to your product.
Further details can be foundhere.
ViaThe Register