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diff --git a/sys/dev/virtio/network/if_vtnet.c b/sys/dev/virtio/network/if_vtnet.c
--- a/sys/dev/virtio/network/if_vtnet.c
+++ b/sys/dev/virtio/network/if_vtnet.c
@@ -657,6 +657,20 @@
negotiated_features = virtio_negotiate_features(dev, features);
+ if (virtio_with_feature(dev, VIRTIO_NET_F_MTU)) {
+ uint16_t mtu;
+
+ mtu = virtio_read_dev_config_2(dev,
+ offsetof(struct virtio_net_config, mtu));
+ if (mtu < VTNET_MIN_MTU /* || mtu > VTNET_MAX_MTU */) {
+ device_printf(dev, "Invalid MTU value: %d. "
+ "MTU feature disabled.\n", mtu);
+ features &= ~VIRTIO_NET_F_MTU;
+ negotiated_features =
+ virtio_negotiate_features(dev, features);
+ }
+ }
+
if (virtio_with_feature(dev, VIRTIO_NET_F_MQ)) {
uint16_t npairs;
diff --git a/sys/dev/virtio/network/if_vtnetvar.h b/sys/dev/virtio/network/if_vtnetvar.h
--- a/sys/dev/virtio/network/if_vtnetvar.h
+++ b/sys/dev/virtio/network/if_vtnetvar.h
@@ -340,6 +340,7 @@
#define VTNET_LRO_FEATURES (VIRTIO_NET_F_GUEST_TSO4 | \
VIRTIO_NET_F_GUEST_TSO6 | VIRTIO_NET_F_GUEST_ECN)
+#define VTNET_MIN_MTU 68
#define VTNET_MAX_MTU 65536
#define VTNET_MAX_RX_SIZE 65550

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