A flaw was found in the Linux kernel present since v4.0-rc1 and through v4.13-rc4. A crafted network packet sent remotely by an attacker may force the kernel to enter an infinite loop in the cipso_v4_optptr() function in net/ipv4/cipso_ipv4.c leading to a denial-of-service. A certain non-default configuration of LSM (Linux Security Module) and NetLabel should be set up on a system before an attacker could leverage this flaw.
https://www.debian.org/security/2018/dsa-4308
https://usn.ubuntu.com/3797-2/
https://usn.ubuntu.com/3797-1/
https://lists.debian.org/debian-lts-announce/2018/10/msg00003.html
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-10938
http://www.securitytracker.com/id/1041569