net/netfilter/nfnetlink_cthelper.c in the Linux kernel through 4.14.4 does not require the CAP_NET_ADMIN capability for new, get, and del operations, which allows local users to bypass intended access restrictions because the nfnl_cthelper_list data structure is shared across all net namespaces. References: https://patchwork.kernel.org/patch/10089373/ https://xorl.wordpress.com/2017/12/10/cve-2017-17448-linux-kernel-cthelper-security-bypass/ An upstream patch: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=4b380c42f7d00a395feede754f0bc2292eebe6e5
Created kernel tracking bugs for this issue: Affects: fedora-all [bug 1525769]
Statement: 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.
What is Red Hat Enterprise Linux 7 for ARM 64, Red Hat Enterprise Linux 7 for Power 9 LE The kernel package as shipped with Red Hat Enterprise Linux 7 for ARM 64 and Red Hat Enterprise Linux 7 for Power 9 LE is an updated kernel intended to support new architectures not available at the time of Red Hat Enterprise Linux 7 original shipping. The new kernel version is based on an upstream Linux kernel version 4.11. The offering is distributed with other updated packages, but most of the userspace is the standard Red Hat Enterprise Linux 7 Server RPM files. For more information please refer to: https://access.redhat.com/articles/3158541 https://access.redhat.com/articles/3158511
This issue has been addressed in the following products: Red Hat Enterprise Linux 7 Via RHSA-2018:0654 https://access.redhat.com/errata/RHSA-2018:0654
This issue has been addressed in the following products: Red Hat Enterprise Linux 7 Via RHSA-2018:0676 https://access.redhat.com/errata/RHSA-2018:0676
This issue has been addressed in the following products: Red Hat Enterprise Linux 7 Via RHSA-2018:1062 https://access.redhat.com/errata/RHSA-2018:1062