diff --git a/net/mctp/device.c b/net/mctp/device.c
index 8d1386601bbe06487bea46eeae56733124c85098..67576cb2728eceea055873e40cf04699b06f49a9 100644
--- a/net/mctp/device.c
+++ b/net/mctp/device.c
@@ -70,6 +70,7 @@ static int mctp_fill_addrinfo(struct sk_buff *skb,
 		return -EMSGSIZE;
 
 	hdr = nlmsg_data(nlh);
+	memset(hdr, 0, sizeof(*hdr));
 	hdr->ifa_family = AF_MCTP;
 	hdr->ifa_prefixlen = 0;
 	hdr->ifa_flags = 0;
diff --git a/net/mctp/neigh.c b/net/mctp/neigh.c
index 590f642413e4ef113a1a9fa96cb548b98cb55621..c0151a69d2b7c215c2e28e3be9d387136380b397 100644
--- a/net/mctp/neigh.c
+++ b/net/mctp/neigh.c
@@ -218,6 +218,7 @@ static int mctp_fill_neigh(struct sk_buff *skb, u32 portid, u32 seq, int event,
 		return -EMSGSIZE;
 
 	hdr = nlmsg_data(nlh);
+	memset(hdr, 0, sizeof(*hdr));
 	hdr->ndm_family = AF_MCTP;
 	hdr->ndm_ifindex = dev->ifindex;
 	hdr->ndm_state = 0; // TODO other state bits?
diff --git a/net/mctp/route.c b/net/mctp/route.c
index 59fbc54d8e66c56f2c3c271f790f593d0db9d847..2262e1d4d591ad73ead3197f275a1d7f1c6534c7 100644
--- a/net/mctp/route.c
+++ b/net/mctp/route.c
@@ -1328,6 +1328,7 @@ static int mctp_fill_rtinfo(struct sk_buff *skb, struct mctp_route *rt,
 		return -EMSGSIZE;
 
 	hdr = nlmsg_data(nlh);
+	memset(hdr, 0, sizeof(*hdr));
 	hdr->rtm_family = AF_MCTP;
 
 	/* we use the _len fields as a number of EIDs, rather than