diff --git a/sys/kern/kern_exec.c b/sys/kern/kern_exec.c
--- a/sys/kern/kern_exec.c
+++ b/sys/kern/kern_exec.c
@@ -37,6 +37,7 @@
 #include <sys/param.h>
 #include <sys/systm.h>
 #include <sys/acct.h>
+#include <sys/asan.h>
 #include <sys/capsicum.h>
 #include <sys/eventhandler.h>
 #include <sys/exec.h>
@@ -1328,6 +1329,8 @@
 		SLIST_REMOVE_HEAD(&exec_args_kva_freelist, next);
 		mtx_unlock(&exec_args_kva_mtx);
 	}
+	kasan_mark((void *)argkva->addr, exec_map_entry_size,
+	    exec_map_entry_size, 0);
 	*(struct exec_args_kva **)cookie = argkva;
 	return (argkva->addr);
 }
@@ -1338,6 +1341,8 @@
 	vm_offset_t base;
 
 	base = argkva->addr;
+	kasan_mark((void *)argkva->addr, 0, exec_map_entry_size,
+	    KASAN_EXEC_ARGS_FREED);
 	if (argkva->gen != gen) {
 		(void)vm_map_madvise(exec_map, base, base + exec_map_entry_size,
 		    MADV_FREE);
diff --git a/sys/kern/subr_asan.c b/sys/kern/subr_asan.c
--- a/sys/kern/subr_asan.c
+++ b/sys/kern/subr_asan.c
@@ -153,6 +153,8 @@
 		return "UMAUseAfterFree";
 	case KASAN_KSTACK_FREED:
 		return "KernelStack";
+	case KASAN_EXEC_ARGS_FREED:
+		return "ExecKVA";
 	case 1 ... 7:
 		return "RedZonePartial";
 	case KASAN_STACK_LEFT:
diff --git a/sys/sys/asan.h b/sys/sys/asan.h
--- a/sys/sys/asan.h
+++ b/sys/sys/asan.h
@@ -53,6 +53,7 @@
 #define KASAN_KMEM_REDZONE	0xFC
 #define	KASAN_UMA_FREED		0xFD
 #define	KASAN_KSTACK_FREED	0xFE
+#define	KASAN_EXEC_ARGS_FREED	0xFF
 
 void kasan_init(void);
 void kasan_shadow_map(void *, size_t);