CVE-2023-20588

CVE-2023-20588 is a division-by-zero vulnerability on some AMD Zen1 CPUs that could cause speculative data leakage and affect confidentiality. The connected Amazon Linux 2 advisory (ALAS2KERNEL-5.4-2025-116) confirms the Linux kernel fix for kernel-5.4 series (e.g., 5.4.254-169.358.amzn2.aarch64/...

CVE-2023-20520

CVE-2023-20520 affects the AMD Secure Processor (ASP) Bootloader. The issue is described as improper access control in the ASP Bootloader which may allow an attacker to corrupt the return address, causing a stack-based buffer overrun and potentially arbitrary code execution. Connected sources ide...

CVE-2021-46756

CVE-2021-46756 describes insufficient validation of inputs in SVC_MAP_USER_STACK in the AMD Secure Processor (ASP) bootloader. A malicious UApp or ABL could send malformed or invalid syscalls to the bootloader, potentially causing a denial of service and loss of integrity. The AMD security bullet...

CVE-2021-26406

CVE-2021-26406 describes insufficient validation in parsing Owner’s Certificate Authority (OCA) certificates within AMD SEV/SEV-ES, potentially causing a host crash and denial of service. The vulnerability is documented across multiple AMD security bulletins (AMD-SB-3001, AMD-SB-4001) with mitiga...