Index: head/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c
===================================================================
--- head/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c
+++ head/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c
@@ -2276,6 +2276,11 @@
 		bus_dma_tag_destroy(txr->hn_tx_data_dtag);
 	if (txr->hn_tx_rndis_dtag != NULL)
 		bus_dma_tag_destroy(txr->hn_tx_rndis_dtag);
+
+#ifdef HN_USE_TXDESC_BUFRING
+	buf_ring_free(txr->hn_txdesc_br, M_NETVSC);
+#endif
+
 	free(txr->hn_txdesc, M_NETVSC);
 	txr->hn_txdesc = NULL;