CVE-2026-64562: KVM: nVMX: Hide shadow VMCS right after VMCLEAR

Published Aug 4, 2026
·
Updated

In the Linux kernel, the following vulnerability has been resolved:

KVM: nVMX: Hide shadow VMCS right after VMCLEAR

freenested() frees the shadow VMCS while vmcs01 still points to it. But because it is asynchronous with respect to loadedvmcsclear(), the vCPU might migrate before the pointer is cleared and loadedvmcsclear() may then execute VMCLEAR.

The VMCS needs to stay attached until its explicit VMCLEAR completes, but then it can be hidden and the page safely freed.

Affected Software

1 affected component
Linux Linux kernel

Event History

Aug 4, 2026
CVE Published
via MITRE·06:23 AM
Data Sourced
via MITRE·06:23 AM
Description
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CVE-2026-64562 - KVM: nVMX: Hide shadow VMCS right after VMCLEAR - SecAlerts