Integer underflow in the dccp_parse_options function (net/dccp/options.c) in
the Linux kernel before 18.104.22.168 allows remote attackers to cause a denial
of service via a Datagram Congestion Control Protocol (DCCP) packet with an
invalid feature options length, which triggers a buffer over-read.
There are no longer any 2.x kernels available in the repository with the exception of sys-kernel/xbox-sources which is unsupported by security.