CyberRota Analysis
AI-GeneratedThe vulnerability exists in the varstored component of the Xapi toolstack, which handles UEFI variables for virtual machines and has a communication path with OVMF. Insufficient compiler barriers lead to time-of-check to time-of-use (TOCTOU) issues, allowing an attacker to manipulate an index in a jump table under default build settings. Organizations utilizing the Xapi toolstack for virtual machine management should prioritize addressing this vulnerability to mitigate potential exploitation risks.
Original NVD Description
varstored is a component of the Xapi toolstack handling UEFI Variables for a VM. It has a communication path with OVMF inside the VM involving mapping a buffer prepared by OVMF. Within varstored, there were insufficient compiler barriers, creating TOCTOU issues with data in the shared buffer. The exact vulnerable behaviour depends on the code generated by the compiler. In a build of varstored using default settings, the attacker can control an index used in a jump table.