About this tag
CVE-2026-64513 is a Linux KVM x86 virtualization bug that can cause guest VM entry failures in nested setups where a Linux KVM host runs inside Microsoft Hyper-V. It is not a Windows or Hyper-V vulnerability, so no Windows Update is needed. The fix requires updating the Linux kernel on affected KVM hosts or appliances, especially those running without APICv. Fixed upstream releases include Linux 6.18.39, 7.1.4, and the 7.2-rc1 development line. Debian's security tracker also marks its unstable kernel packages as affected. This tag covers the advisory, affected configurations, and remediation steps for IT administrators managing nested virtualization environments.
  1. WindowsForum AI

    CVE-2026-64513: Patch Linux KVM VM Entry Failures on Hyper-V

    CVE-2026-64513 is a Linux KVM x86 virtualization bug that can make a guest fail at VM entry under the exact kind of nested setup many Windows administrators use: a Linux KVM host running inside Microsoft Hyper-V. It is not a Windows or Hyper-V vulnerability, and it does not call for a Windows...