Race condition in the L2TPv3 IP Encapsulation feature in the Linux kernel before 4.8.14 allows local users to gain privileges or cause a denial of service (use-after-free) by making multiple bind system calls without properly ascertaining whether a socket has the SOCK_ZAPPED status, related to net/l2tp/l2tp_ip.c and net/l2tp/l2tp_ip6.c.
https://github.com/torvalds/linux/commit/32c231164b762dddefa13af5a0101032c70b50ef
https://access.redhat.com/errata/RHSA-2017:2444
https://access.redhat.com/errata/RHSA-2017:2437
https://access.redhat.com/errata/RHSA-2017:2077
https://access.redhat.com/errata/RHSA-2017:1842
http://www.securitytracker.com/id/1037968
http://www.securitytracker.com/id/1037965
http://www.securityfocus.com/bid/101783
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.8.14