The __netlink_deliver_tap_skb function in net/netlink/af_netlink.c in the Linux kernel through 4.14.4, when CONFIG_NLMON is enabled, does not restrict observations of Netlink messages to a single net namespace, which allows local users to obtain sensitive information by leveraging the CAP_NET_ADMIN capability to sniff an nlmon interface for all Netlink activity on the system. References: https://lkml.org/lkml/2017/12/5/950 http://patchwork.ozlabs.org/patch/845319/ An upstream patch: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=93c647643b48f0131f02e45da3bd367d80443291
Created kernel tracking bugs for this issue: Affects: fedora-all [bug 1525763]
Statement: This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5 and 6, 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 MRG 2, 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
This issue has been addressed in the following products: Red Hat Enterprise MRG 2 Via RHSA-2018:1170 https://access.redhat.com/errata/RHSA-2018:1170
This issue has been addressed in the following products: Red Hat Enterprise Linux 7.4 Extended Update Support Via RHSA-2018:1130 https://access.redhat.com/errata/RHSA-2018:1130