static int kvm_is_user_mode(void)
{
	int user_mode = 3;

	if (percpu_read(current_vcpu))
		user_mode = kvm_x86_ops->get_cpl(percpu_read(current_vcpu));

	return user_mode != 0;
}

The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.