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CVE-2025-58151varstored: TOCTOU issues with mapped guest memory

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.

9.4 CRITICALEPSS 0.13%Not in KEVNVD: Deferred

OverviewAffected ProductsReferences
NVD CVE.org

Overview

Severity

ScoreSeverityVersionVector String
9.4CRITICAL4.0XEN (CNA)CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

Details

CVE ID
CVE-2025-58151
Status
Deferred
Assigner (CNA)
XEN
Published
Jul 9, 2026
Last modified
2026-09-29 19:10 UTC
Weaknesses
  • CWE-367 · Time-of-check time-of-use (TOCTOU) race condition

Sources

Refreshed hourly from the sources above. Last fetched 2026-11-08 07:30 UTC.