The tcp_splice_read function in net/ipv4/tcp.c in the Linux kernel before 4.9.11 allows remote attackers to cause a denial of service (infinite loop and soft lockup) via vectors involving a TCP packet with the URG flag.
https://access.redhat.com/errata/RHSA-2017:1372
https://access.redhat.com/errata/RHSA-2017:1615
https://access.redhat.com/errata/RHSA-2017:1616
https://access.redhat.com/errata/RHSA-2017:1647
https://github.com/torvalds/linux/commit/ccf7abb93af09ad0868ae9033d1ca8108bdaec82
http://www.debian.org/security/2017/dsa-3804
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.11