The tcp_disconnect function in net/ipv4/tcp.c in the Linux kernel before 4.12 allows local users to cause a denial of service (__tcp_select_window divide-by-zero error and system crash) by triggering a disconnect within a certain tcp_recvmsg code path.
http://lists.opensuse.org/opensuse-security-announce/2018-01/msg00007.html
https://access.redhat.com/errata/RHSA-2017:2918
https://access.redhat.com/errata/RHSA-2017:2930
https://access.redhat.com/errata/RHSA-2017:2931
https://access.redhat.com/errata/RHSA-2017:3200
https://access.redhat.com/errata/RHSA-2018:2172
https://github.com/torvalds/linux/commit/499350a5a6e7512d9ed369ed63a4244b6536f4f8