diff --git a/hypervisor/arch/x86/configs/vm_config.c b/hypervisor/arch/x86/configs/vm_config.c
index f109eaba9..3ed8feadd 100644
--- a/hypervisor/arch/x86/configs/vm_config.c
+++ b/hypervisor/arch/x86/configs/vm_config.c
@@ -9,6 +9,7 @@
 #include <logmsg.h>
 #include <cat.h>
 #include <pgtable.h>
+#include <vuart.h>
 
 static uint8_t rtvm_uuid1[16] = RTVM_UUID1;
 static uint8_t safety_vm_uuid1[16] = SAFETY_VM_UUID1;
@@ -93,7 +94,7 @@ static bool check_vm_uuid_collision(uint16_t vm_id)
 bool sanitize_vm_config(void)
 {
 	bool ret = true;
-	uint16_t vm_id, vcpu_id, nr;
+	uint16_t vm_id, vcpu_id, vuart_idx, nr;
 	uint64_t sos_pcpu_bitmap, pre_launch_pcpu_bitmap = 0U, vm_pcpu_bitmap;
 	struct acrn_vm_config *vm_config;
 
@@ -200,6 +201,20 @@ bool sanitize_vm_config(void)
 			/* make sure no identical UUID in following VM configurations */
 			ret = check_vm_uuid_collision(vm_id);
 		}
+
+		/* vuart[1+] are used for VM communications */
+		for (vuart_idx = 1U; vuart_idx < MAX_VUART_NUM_PER_VM; vuart_idx++) {
+			const struct vuart_config *vu_config = &vm_config->vuart[vuart_idx];
+
+			if (!(vu_config->type == VUART_LEGACY_PIO) && (vu_config->addr.port_base == INVALID_COM_BASE)) {
+				if ((vu_config->t_vuart.vm_id >= CONFIG_MAX_VM_NUM) ||
+					(vu_config->t_vuart.vm_id == vm_id)) {
+					pr_err("%s invalid vuart configuration for VM %d\n", __func__, vm_id);
+					ret = false;
+				}
+			}
+		}
+
 		if (!ret) {
 			break;
 		}
diff --git a/hypervisor/dm/vuart.c b/hypervisor/dm/vuart.c
index d6d57867a..8771a7d8a 100644
--- a/hypervisor/dm/vuart.c
+++ b/hypervisor/dm/vuart.c
@@ -580,17 +580,16 @@ static struct acrn_vuart *find_active_target_vuart(const struct vuart_config *vu
 
 	target_vmid = vu_config->t_vuart.vm_id;
 	target_vuid = vu_config->t_vuart.vuart_id;
-	if (target_vmid < CONFIG_MAX_VM_NUM) {
+
+	if ((target_vmid < CONFIG_MAX_VM_NUM) && (target_vuid < MAX_VUART_NUM_PER_VM)) {
 		target_vm = get_vm_from_vmid(target_vmid);
-	}
-
-	if (target_vuid < MAX_VUART_NUM_PER_VM) {
 		target_vu = &target_vm->vuart[target_vuid];
+
+		if ((target_vu != NULL) && (target_vu->active)) {
+			ret_vu = target_vu;
+		}
 	}
 
-	if ((target_vu != NULL) && (target_vu->active)) {
-		ret_vu = target_vu;
-	}
 	return ret_vu;
 }