Insufficient parameter validation while allocating process space in the Trusted OS (TOS) may allow for a malicious userspace process to trigger an integer overflow, leading to a potential denial of service.
https://www.amd.com/en/resources/product-security/bulletin/AMD-SB-6018.html
https://www.amd.com/en/resources/product-security/bulletin/AMD-SB-5007.html
https://www.amd.com/en/resources/product-security/bulletin/AMD-SB-4012.html