diff --git a/net/mctp/device.c b/net/mctp/device.c
index aec7ffad2666..a11d5aca201c 100644
--- a/net/mctp/device.c
+++ b/net/mctp/device.c
@@ -55,6 +55,7 @@ static int mctp_fill_addrinfo(struct sk_buff *skb, struct netlink_callback *cb,
 		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 bc75a263719c..18a6be38f172 100644
--- a/net/mctp/neigh.c
+++ b/net/mctp/neigh.c
@@ -217,6 +217,7 @@ 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 48d32bfd3863..a93796eb0a09 100644
--- a/net/mctp/route.c
+++ b/net/mctp/route.c
@@ -1031,6 +1031,7 @@ 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