diff --git a/kernel/host.c b/kernel/host.c
index b3ca7dd0..61715f09 100644
--- a/kernel/host.c
+++ b/kernel/host.c
@@ -254,7 +254,7 @@ int prepare_process_ranges_args_envs(struct thread *thread,
 #endif
 
 	/* Map, copy and update args and envs */
-	flags = VR_PROT_READ | VR_PROT_WRITE;
+	flags = VR_PROT_READ | VR_PROT_WRITE | VR_PRIVATE;
 	flags |= VRFLAG_PROT_TO_MAXPROT(flags);
 	addr = vm->region.map_start - PAGE_SIZE * SCD_RESERVED_COUNT;
 	e = addr + PAGE_SIZE * ARGENV_PAGE_COUNT;
diff --git a/kernel/process.c b/kernel/process.c
index d1856ad0..cb1bec83 100644
--- a/kernel/process.c
+++ b/kernel/process.c
@@ -2303,7 +2303,7 @@ int init_process_stack(struct thread *thread, struct program_load_desc *pn,
 
 	memset(stack, 0, minsz);
 
-	vrflag = VR_STACK | VR_DEMAND_PAGING;
+	vrflag = VR_STACK | VR_DEMAND_PAGING | VR_PRIVATE;
 	vrflag |= ((ap_flag & IHK_MC_AP_USER) ? VR_AP_USER : 0);
 	vrflag |= PROT_TO_VR_FLAG(pn->stack_prot);
 	vrflag |= VR_MAXPROT_READ | VR_MAXPROT_WRITE | VR_MAXPROT_EXEC;
diff --git a/kernel/syscall.c b/kernel/syscall.c
index 8420d7fa..618d8640 100644
--- a/kernel/syscall.c
+++ b/kernel/syscall.c
@@ -2203,6 +2203,7 @@ SYSCALL_DECLARE(brk)
 #else /* POSTK_DEBUG_ARCH_DEP_60 */
 	vrflag = VR_PROT_READ | VR_PROT_WRITE;
 #endif /* POSTK_DEBUG_ARCH_DEP_60 */
+	vrflag |= VR_PRIVATE;
 	vrflag |= VRFLAG_PROT_TO_MAXPROT(vrflag);
 	old_brk_end_allocated = region->brk_end_allocated;
 	ihk_mc_spinlock_lock_noirq(&cpu_local_var(current)->vm->memory_range_lock);