This script is Copyright (C) 2014-2017 Tenable Network Security, Inc.
The remote Red Hat host is missing one or more security updates.
Updated kernel packages that fix one security issue and several bugs
are now available for Red Hat Enterprise Linux 6.4 Extended Update
Red Hat Product Security has rated this update as having Important
security impact. A Common Vulnerability Scoring System (CVSS) base
score, which gives a detailed severity rating, is available from the
CVE link in the References section.
The kernel packages contain the Linux kernel, the core of any Linux
* A flaw was found in the way the Linux kernel's futex subsystem
handled reference counting when requeuing futexes during futex_wait().
A local, unprivileged user could use this flaw to zero out the
reference counter of an inode or an mm struct that backs up the memory
area of the futex, which could lead to a use-after-free flaw,
resulting in a system crash or, potentially, privilege escalation.
The security impact of this issue was discovered by Mateusz Guzik of
This update also fixes the following bugs :
* A rare race between the file system unmount code and the file system
notification code could lead to a kernel panic. With this update, a
series of patches has been applied to the kernel to prevent this
* Previously, recovery of a double-degraded RAID6 array could, under
certain circumstances, result in data corruption. This could happen
because the md driver was using an optimization that is safe to use
only for single-degraded arrays. This update ensures that this
optimization is skipped during the recovery of double-degraded RAID6
* Later Intel CPUs added a new 'Condition Changed' bit to the
MSR_CORE_PERF_GLOBAL_STATUS register. Previously, the kernel falsely
assumed that this bit indicates a performance interrupt, which
prevented other NMI handlers from running and executing. To fix this
problem, a patch has been applied to the kernel to ignore this bit in
the perf code, enabling other NMI handlers to run. (BZ#1134695)
* Previously, certain network device drivers did not accept ethtool
commands right after they were mounted. As a consequence, the current
setting of the specified device driver was not applied and an error
message was returned. The ETHTOOL_DELAY variable has been added, which
makes sure the ethtool utility waits for some time before it tries to
apply the options settings, thus fixing the bug. (BZ#1138300)
All kernel users are advised to upgrade to these updated packages,
which contain backported patches to correct these issues. The system
must be rebooted for this update to take effect.
See also :
Update the affected packages.
Risk factor :
Medium / CVSS Base Score : 6.9