CVE-2026-89930 KVM: nVMX: Service local TLB flushes on failed nested VM-Enter

In the Linux kernel, the following vulnerability has been resolved: KVM: nVMX: Service local TLB flushes on failed nested VM-Enter KVM services local TLB flushes on "full" nested VM-Exits through nestedvmxvmexit, but not if a nested VM-Enter fails e.g. due to failed VMCS checks in...

CVE-2026-89930

CVE-2026-89930 affects the Linux kernel's KVM nVMX subsystem (nested virtualization). The root cause is that KVM failed to service local TLB flushes when a nested VM-Enter failed (e.g., due to failed VMCS checks in nested_vmx_enter_non_root_mode()). Specifically, a failed VM-Enter would update la...