Index: head/emulators/virtualbox-ose-kmod/Makefile
===================================================================
--- head/emulators/virtualbox-ose-kmod/Makefile
+++ head/emulators/virtualbox-ose-kmod/Makefile
@@ -3,7 +3,7 @@
 
 PORTNAME=	virtualbox-ose
 PORTVERSION=	5.2.44
-PORTREVISION=	3
+PORTREVISION=	4
 CATEGORIES=	emulators
 MASTER_SITES=	https://download.oracle.com/virtualbox/${PORTVERSION}/
 PKGNAMESUFFIX=	-kmod
Index: head/emulators/virtualbox-ose/files/patch-src_VBox_HostDrivers_VBoxNetFlt_freebsd_VBoxNetFlt-freebsd.c
===================================================================
--- head/emulators/virtualbox-ose/files/patch-src_VBox_HostDrivers_VBoxNetFlt_freebsd_VBoxNetFlt-freebsd.c
+++ head/emulators/virtualbox-ose/files/patch-src_VBox_HostDrivers_VBoxNetFlt_freebsd_VBoxNetFlt-freebsd.c
@@ -0,0 +1,34 @@
+--- src/VBox/HostDrivers/VBoxNetFlt/freebsd/VBoxNetFlt-freebsd.c.orig	2020-07-28 21:59:30.107638000 -0700
++++ src/VBox/HostDrivers/VBoxNetFlt/freebsd/VBoxNetFlt-freebsd.c	2020-07-28 22:00:37.858885000 -0700
+@@ -361,7 +361,14 @@
+     {
+         if (mtag != NULL || !fActive)
+         {
++#if __FreeBSD_version >= 1300049
++            struct epoch_tracker et;
++            NET_EPOCH_ENTER(et);
++#endif
+             ether_demux(ifp, m);
++#if __FreeBSD_version >= 1300049
++            NET_EPOCH_EXIT(et);
++#endif
+             if (fActive)
+                 vboxNetFltRelease(pThis, true /*fBusy*/);
+             VBOXCURVNET_RESTORE();
+@@ -457,7 +464,16 @@
+         if (fDropIt)
+             m_freem(m);
+         else
++        {
++#if __FreeBSD_version >= 1300049
++            struct epoch_tracker et;
++            NET_EPOCH_ENTER(et);
++#endif
+             ether_demux(ifp, m);
++#if __FreeBSD_version >= 1300049
++            NET_EPOCH_EXIT(et);
++#endif
++        }
+     }
+     vboxNetFltRelease(pThis, true /* fBusy */);
+     VBOXCURVNET_RESTORE();