In the Linux kernel before 5.0, a memory leak exists in sit_init_net() in net/ipv6/sit.c when register_netdev() fails to register sitn->fb_tunnel_dev, which may cause denial of service, aka CID-07f12b26e21a.
https://security.netapp.com/advisory/ntap-20191031-0005/
https://github.com/torvalds/linux/commit/07f12b26e21ab359261bf75cfcb424fdc7daeb6d
http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00021.html