Improper Access Control in AMD SEV Firmware Allows Encryption Bit Manipulation

Improper Access Control Applied to Mirrored or Aliased Memory Regions in AMD Secure Encrypted Virtualization (SEV) firmware could allow a malicious hypervisor to change the encryption bit for guest context pages potentially resulting in loss of integrity.

Improper Access Control Applied to Mirrored or Aliased Memory Regions in Hypervisor

memory corruption while loading a PIL authenticated VM, when authenticated VM image is loaded without maintaining cache coherency.

Windows Elevation of Privilege Vulnerability

An elevation of privilege vulnerability exists in the way that the PsmServiceExtHost.dll handles objects in memory. An attacker who successfully exploited the vulnerability could execute code with elevated permissions. To exploit the vulnerability, a locally authenticated attacker could run a specially crafted application. The security update addresses the vulnerability by ensuring the PsmServiceExtHost.dll properly handles objects in memory.

Dell Client Platform BIOS contains an Improper Access Control Applied to Mirrored or Aliased Memory Regions vulnerability in an externally developed component. A high privileged attacker with local access could potentially exploit this vulnerability, leading to Code execution.