diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c
index e1110a7bd3e64a..b32b42c424e028 100644
--- a/kernel/time/ntp.c
+++ b/kernel/time/ntp.c
@@ -686,10 +686,10 @@ static inline void process_adjtimex_modes(const struct timex *txc, s32 *time_tai
 	}
 
 	if (txc->modes & ADJ_MAXERROR)
-		time_maxerror = txc->maxerror;
+		time_maxerror = clamp(txc->maxerror, (__kernel_long_t)0, (__kernel_long_t)NTP_PHASE_LIMIT);
 
 	if (txc->modes & ADJ_ESTERROR)
-		time_esterror = txc->esterror;
+		time_esterror = clamp(txc->esterror, (__kernel_long_t)0, (__kernel_long_t)NTP_PHASE_LIMIT);
 
 	if (txc->modes & ADJ_TIMECONST) {
 		time_constant = txc->constant;