An issue was discovered in the Linux kernel before 4.18.11. The ipddp_ioctl function in drivers/net/appletalk/ipddp.c allows local users to obtain sensitive kernel address information by leveraging CAP_NET_ADMIN to read the ipddp_route dev and next fields via an SIOCFINDIPDDPRT ioctl call. Upstream Patch: http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=9824dfae https://github.com/torvalds/linux/commit/9824dfae https://lkml.org/lkml/2018/9/27/480