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
@@ -94,6 +94,7 @@
 static abort_handler align_abort;
 static abort_handler data_abort;
 static abort_handler external_abort;
+static abort_handler tag_check_abort;
 
 static abort_handler *abort_handlers[] = {
 	[ISS_DATA_DFSC_TF_L0] = data_abort,
@@ -106,6 +107,7 @@
 	[ISS_DATA_DFSC_PF_L1] = data_abort,
 	[ISS_DATA_DFSC_PF_L2] = data_abort,
 	[ISS_DATA_DFSC_PF_L3] = data_abort,
+	[ISS_DATA_DFSC_TAG] = tag_check_abort,
 	[ISS_DATA_DFSC_ALIGN] = align_abort,
 	[ISS_DATA_DFSC_EXT] =  external_abort,
 	[ISS_DATA_DFSC_EXT_L0] =  external_abort,
@@ -250,6 +252,26 @@
 	panic("Unhandled external data abort");
 }
 
+static void
+tag_check_abort(struct thread *td, struct trapframe *frame, uint64_t esr,
+    uint64_t far, int lower)
+{
+	/*
+	 * A Tag Check Fault should be handled as a SIGSEGV if it occurs
+	 * at EL0 and a kernel panic if at EL1.
+	 */
+	if (!lower) {
+		print_registers(frame);
+		print_gp_register("far", far);
+		printf(" esr: 0x%.16lx\n", esr);
+		panic("Tag Check Fault");
+	}
+
+	call_trapsignal(td, SIGSEGV, SEGV_MTESERR, (void *)far,
+	    ESR_ELx_EXCEPTION(frame->tf_esr));
+	userret(td, frame);
+}
+
 /*
  * It is unsafe to access the stack canary value stored in "td" until
  * kernel map translation faults are handled, see the pmap_klookup() call below.
diff --git a/sys/sys/signal.h b/sys/sys/signal.h
--- a/sys/sys/signal.h
+++ b/sys/sys/signal.h
@@ -307,6 +307,8 @@
 #define SEGV_ACCERR	2	/* Invalid permissions for mapped	*/
 				/* object.				*/
 #define	SEGV_PKUERR	100	/* x86: PKU violation			*/
+#define	SEGV_MTEAERR	100	/* arm64: Asynchronous Arm MTE error	*/
+#define	SEGV_MTESERR	101	/* arm64: Synchronous Arm MTE error	*/
 
 /* codes for SIGFPE */
 #define FPE_INTOVF	1	/* Integer overflow.			*/