diff --git a/autobuild_mac80211_release/mt7986_mac80211/package/kernel/mt76/patches/0005-mt76-mt7915-fix-MBSS-index-condition-in-DBDC-mode.patch b/autobuild_mac80211_release/mt7986_mac80211/package/kernel/mt76/patches/0005-mt76-mt7915-fix-MBSS-index-condition-in-DBDC-mode.patch
new file mode 100644
index 0000000..5e0d81f
--- /dev/null
+++ b/autobuild_mac80211_release/mt7986_mac80211/package/kernel/mt76/patches/0005-mt76-mt7915-fix-MBSS-index-condition-in-DBDC-mode.patch
@@ -0,0 +1,43 @@
+From c931d9454ecfce777ac68071d4687f1ebb302917 Mon Sep 17 00:00:00 2001
+From: Evelyn Tsai <evelyn.tsai@mediatek.com>
+Date: Mon, 7 Mar 2022 19:32:29 +0800
+Subject: [PATCH 5/6] mt76: mt7915: fix MBSS index condition in DBDC mode
+
+MT7915_MAX_INTERFACES is per-band declartion.
+
+Signed-off-by: Evelyn Tsai <evelyn.tsai@mediatek.com>
+Signed-off-by: Bo Jiao <bo.jiao@mediatek.com>
+---
+ mt76.h        | 2 +-
+ mt7915/main.c | 2 +-
+ 2 files changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/mt76.h b/mt76.h
+index d5f8650f..6e528e42 100644
+--- a/mt76.h
++++ b/mt76.h
+@@ -732,7 +732,7 @@ struct mt76_dev {
+ 	u32 wcid_mask[DIV_ROUND_UP(MT76_N_WCIDS, 32)];
+ 	u32 wcid_phy_mask[DIV_ROUND_UP(MT76_N_WCIDS, 32)];
+ 
+-	u32 vif_mask;
++	u64 vif_mask;
+ 
+ 	struct mt76_wcid global_wcid;
+ 	struct mt76_wcid __rcu *wcid[MT76_N_WCIDS];
+diff --git a/mt7915/main.c b/mt7915/main.c
+index c3f44d80..3111217b 100644
+--- a/mt7915/main.c
++++ b/mt7915/main.c
+@@ -205,7 +205,7 @@ static int mt7915_add_interface(struct ieee80211_hw *hw,
+ 		phy->monitor_vif = vif;
+ 
+ 	mvif->mt76.idx = ffs(~dev->mt76.vif_mask) - 1;
+-	if (mvif->mt76.idx >= MT7915_MAX_INTERFACES) {
++	if (mvif->mt76.idx >= MT7915_MAX_INTERFACES * (dev->dbdc_support + 1)) {
+ 		ret = -ENOSPC;
+ 		goto out;
+ 	}
+-- 
+2.18.0
+