The net/netfilter/nfnetlink_cthelper.c function in the Linux kernel through 4.14.4 does not require the CAP_NET_ADMIN capability for new, get, and del operations. This allows local users to bypass intended access restrictions because the nfnl_cthelper_list data structure is shared across all net namespaces.
Find out more about CVE-2017-17448 from the
MITRE CVE dictionary dictionary and
This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5, 6 and Red Hat Enterprise MRG 2, as a code with the flaw is not present or is not built in the products listed.
This issue affects the versions of the Linux kernel as shipped with Red Hat Enterprise Linux 7, its real-time kernel, Red Hat Enterprise Linux 7 for ARM 64 and Red Hat Enterprise Linux 7 for Power 9 LE. Future Linux kernel updates for the respective releases may address this issue.