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diff --git a/sys/kern/kern_procctl.c b/sys/kern/kern_procctl.c
--- a/sys/kern/kern_procctl.c
+++ b/sys/kern/kern_procctl.c
@@ -267,7 +267,11 @@
error = cr_cansignal(w->cr, w->target, w->rk->rk_sig);
if (error != 0) {
- if (*w->error == ESRCH) {
+ /*
+ * Hide ESRCH errors to ensure that this function
+ * cannot be used as an oracle for process visibility.
+ */
+ if (error != ESRCH && *w->error == 0) {
w->rk->rk_fpid = w->target->p_pid;
*w->error = error;
}

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