Xen Varstored vulnerabilities

1 vulnerability

Known vulnerabilities in Xen Varstored, newest first, with CVSS severity, EPSS, KEV listings, ransomware use and the affected versions.

PrioritiseCVE-2025-58151xen · varstored +1 morevarstored: TOCTOU issues with mapped guest memoryvarstored 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.CVSS9.4CriticalEPSS0.14%