Index: head/sys/kern/sys_capability.c
===================================================================
--- head/sys/kern/sys_capability.c
+++ head/sys/kern/sys_capability.c
@@ -102,8 +102,7 @@
 	newcred = crget();
 	p = td->td_proc;
 	PROC_LOCK(p);
-	oldcred = p->p_ucred;
-	crcopy(newcred, oldcred);
+	oldcred = crcopysafe(p, newcred);
 	newcred->cr_flags |= CRED_FLAG_CAPMODE;
 	p->p_ucred = newcred;
 	PROC_UNLOCK(p);