Improper access control in the DRTM firmware could allow a privileged attacker to perform multiple driver initializations, resulting in stack memory corruption that could potentially lead to loss of integrity or availability.
https://www.amd.com/en/resources/product-security/bulletin/amd-sb-5004.html
https://www.amd.com/en/resources/product-security/bulletin/amd-sb-4008.html