The Linux kernel before 4.15-rc8 was found to be vulnerable to a NULL pointer dereference bug in the __netlink_ns_capable() function in the net/netlink/af_netlink.c file. A local attacker could exploit this when a net namespace with a netnsid is assigned to cause a kernel panic and a denial of service.
https://marc.info/?l=linux-netdev&m=151500466401174&w=2
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-14646
https://access.redhat.com/errata/RHSA-2018:3843