CVE-2025-58151

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...

CVE-2025-58151

CVE-2025-58151 affects varstored, a Xen/Xapi component that handles UEFI variables and maps guest memory to OVMF. The vulnerability arises from TOCTOU due to insufficient compiler barriers in the shared buffer, with exploitation depending on compiler-generated code, and the attacker potentially c...