diff --git a/net/mac80211/agg-rx.c b/net/mac80211/agg-rx.c
index 282e99b..a5d69df 100644
--- a/net/mac80211/agg-rx.c
+++ b/net/mac80211/agg-rx.c
@@ -409,8 +409,10 @@
 	}
 
 end:
-	if (status == WLAN_STATUS_SUCCESS)
+	if (status == WLAN_STATUS_SUCCESS) {
 		__set_bit(tid, sta->ampdu_mlme.agg_session_valid);
+		__clear_bit(tid, sta->ampdu_mlme.unexpected_agg);
+	}
 	mutex_unlock(&sta->ampdu_mlme.mtx);
 
 end_no_lock:
diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index 284f0f2..ad636c9 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -1122,8 +1122,15 @@
 	tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
 
 	tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]);
-	if (!tid_agg_rx)
+	if (!tid_agg_rx) {
+		if (ack_policy == IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK &&
+		    !test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) &&
+		    !test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg))
+			ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid,
+					     WLAN_BACK_RECIPIENT,
+					     WLAN_REASON_QSTA_REQUIRE_SETUP);
 		goto dont_reorder;
+	}
 
 	/* qos null data frames are excluded */
 	if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
diff --git a/net/mac80211/sta_info.h b/net/mac80211/sta_info.h
index 0556be3..530231b 100644
--- a/net/mac80211/sta_info.h
+++ b/net/mac80211/sta_info.h
@@ -230,6 +230,8 @@
  * @tid_rx_stop_requested:  bitmap indicating which BA sessions per TID the
  *	driver requested to close until the work for it runs
  * @agg_session_valid: bitmap indicating which TID has a rx BA session open on
+ * @unexpected_agg: bitmap indicating which TID already sent a delBA due to
+ *	unexpected aggregation related frames outside a session
  * @work: work struct for starting/stopping aggregation
  * @tid_tx: aggregation info for Tx per TID
  * @tid_start_tx: sessions where start was requested
@@ -244,6 +246,7 @@
 	unsigned long tid_rx_timer_expired[BITS_TO_LONGS(IEEE80211_NUM_TIDS)];
 	unsigned long tid_rx_stop_requested[BITS_TO_LONGS(IEEE80211_NUM_TIDS)];
 	unsigned long agg_session_valid[BITS_TO_LONGS(IEEE80211_NUM_TIDS)];
+	unsigned long unexpected_agg[BITS_TO_LONGS(IEEE80211_NUM_TIDS)];
 	/* tx */
 	struct work_struct work;
 	struct tid_ampdu_tx __rcu *tid_tx[IEEE80211_NUM_TIDS];