Index: kernel/generic/src/ipc/sysipc.c
===================================================================
--- kernel/generic/src/ipc/sysipc.c	(revision 6df41418d0196f04b16391c56883d36325ab4b0d)
+++ kernel/generic/src/ipc/sysipc.c	(revision 4428d625438c3a087e37dbed0b73e46d912e9d4a)
@@ -724,5 +724,5 @@
 sys_errno_t sys_ipc_hangup(sysarg_t handle)
 {
-	kobject_t *kobj = kobject_get(TASK, handle, KOBJECT_TYPE_PHONE);
+	kobject_t *kobj = cap_unpublish(TASK, handle, KOBJECT_TYPE_PHONE);
 	if (!kobj)
 		return ENOENT;
@@ -730,4 +730,5 @@
 	errno_t rc = ipc_phone_hangup(kobj->phone);
 	kobject_put(kobj);
+	cap_free(TASK, handle);
 	return rc;
 }