diff --git a/sys/arm64/arm64/trap.c b/sys/arm64/arm64/trap.c
--- a/sys/arm64/arm64/trap.c
+++ b/sys/arm64/arm64/trap.c
@@ -225,6 +225,12 @@
 external_abort(struct thread *td, struct trapframe *frame, uint64_t esr,
     uint64_t far, int lower)
 {
+	if (lower) {
+		call_trapsignal(td, SIGBUS, BUS_OBJERR, (void *)far,
+		    ESR_ELx_EXCEPTION(frame->tf_esr));
+		userret(td, frame);
+		return;
+	}
 
 	/*
 	 * Try to handle synchronous external aborts caused by