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

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 cleare...

CVE-2026-64562

CVE-2026-64562 : In the Linux kernel KVM nVMX, a shadow VMCS could be freed prematurely by free_nested() while vmcs01 still referenced it. Since this occurs asynchronously with respect to loaded_vmcs_clear(), a vCPU could migrate and __loaded_vmcs_clear() may then execute VMCLEAR. The vulnerabili...

EUVD-2026-9392

In the context switch logic Xen attempts to skip an IBPB in the case of a vCPU returning to a CPU on which it was the previous vCPU to run. While safe for Xen's isolation between vCPUs, this prevents the guest kernel correctly isolating between tasks. Consider: 1 vCPU runs on CPU A, running task ...

CVE-2026-23553

In the context switch logic Xen attempts to skip an IBPB in the case of a vCPU returning to a CPU on which it was the previous vCPU to run. While safe for Xen's isolation between vCPUs, this prevents the guest kernel correctly isolating between tasks. Consider: 1 vCPU runs on CPU A, running task ...

CVE-2026-23553 x86: incomplete IBPB for vCPU isolation

In the context switch logic Xen attempts to skip an IBPB in the case of a vCPU returning to a CPU on which it was the previous vCPU to run. While safe for Xen's isolation between vCPUs, this prevents the guest kernel correctly isolating between tasks. Consider: 1 vCPU runs on CPU A, running task ...

CVE-2025-38455

In the Linux kernel, the following vulnerability has been resolved: KVM: SVM: Reject SEV-ES intra host migration if vCPU creation is in-flight Reject migration of SEV-ES state if either the source or destination VM is actively creating a vCPU, i.e. if kvmvmioctlcreatevcpu is in the section betwee...