This script is Copyright (C) 2016-2017 Tenable Network Security, Inc.
The remote Red Hat host is missing one or more security updates.
An update for kernel-rt is now available for Red Hat Enterprise Linux
Red Hat Product Security has rated this update as having a security
impact of Important. A Common Vulnerability Scoring System (CVSS) base
score, which gives a detailed severity rating, is available for each
vulnerability from the CVE link(s) in the References section.
The kernel-rt packages provide the Real Time Linux Kernel, which
enables fine-tuning for systems with extremely high determinism
* A flaw was found in the Linux kernel's keyring handling code, where
in key_reject_and_link() an uninitialised variable would eventually
lead to arbitrary free address which could allow attacker to use a
use-after-free style attack. (CVE-2016-4470, Important)
* The ovl_setattr function in fs/overlayfs/inode.c in the Linux kernel
through 4.3.3 attempts to merge distinct setattr operations, which
allows local users to bypass intended access restrictions and modify
the attributes of arbitrary overlay files via a crafted application.
Red Hat would like to thank Nathan Williams for reporting
CVE-2015-8660. The CVE-2016-4470 issue was discovered by David Howells
(Red Hat Inc.).
The kernel-rt packages have been upgraded to the
kernel-3.10.0-327.28.2.el7 source tree, which provides a number of bug
fixes over the previous version. (BZ#1350307)
This update also fixes the following bugs :
* Previously, use of the get/put_cpu_var() function in function
refill_stock() from the memcontrol cgroup code lead to a 'scheduling
while atomic' warning. With this update, refill_stock() uses the
get/put_cpu_light() function instead, and the warnings no longer
* Prior to this update, if a real time task pinned to a given CPU was
taking 100% of the CPU time, then calls to the lru_add_drain_all()
function on other CPUs blocked for an undetermined amount of time.
This caused latencies and undesired side effects. With this update,
lru_add_drain_all() has been changed to drain the LRU pagevecs of
remote CPUs. (BZ#1348523)
See also :
Update the affected packages.
Risk factor :
High / CVSS Base Score : 7.2
CVSS Temporal Score : 6.0
Public Exploit Available : true