This code is handling the option field in incoming IPv6 packets. The object being manipulated is a linked list of packet structs. And that linked list is almost always a single member list.

As many as 4.2 million hosts have been found susceptible to the attacks, including VPN servers, ISP home routers, core internet routers, mobile network gateways, and content delivery network (CDN) ...

IP breaks down data into smaller packets, so that it can transmit over a network smoothly. There are currently two versions of Internet Protocol: IPv4 (IP version 4) and IPv6 (IP version 6).

Juniper Networks has patched multiple high-severity vulnerabilities in Junos OS and its third-party components.