CVE-2026-64286

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

KVM: arm64: Clear __hyp_running_vcpu when flushing the pKVM hyp vCPU

flush_hyp_vcpu() copies the host vCPU context into the hyp's private

vCPU on every run. ctxt_to_vcpu() expects a guest context to have a

NULL __hyp_running_vcpu, which is only ever set on the host context, so

that it resolves the vCPU via container_of(). While this is generally

the case, flush_hyp_vcpu() copies the context verbatim and does not

enforce this, so a value provided by the host is dereferenced at EL2

(host -> EL2).

Fix by clearing __hyp_running_vcpu after the copy.