VULNERABILITY INTELLIGENCE
CVE-2025-58151
EPSS probability0.14%
CISA KEVNot currently listed
Published2026-07-09
Last modified2026-09-29
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.
Weakness classification
- security@xen.org: CWE-367