RHEL 6 : kernel (RHSA-2017:0031)

This script is Copyright (C) 2017 Tenable Network Security, Inc.


Synopsis :

The remote Red Hat host is missing one or more security updates.

Description :

An update for kernel is now available for Red Hat Enterprise Linux 6.7
Extended Update Support.

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 packages contain the Linux kernel, the core of any Linux
operating system.

Security Fix(es) :

* A use-after-free vulnerability was found in the kernels socket
recvmmsg subsystem. This may allow remote attackers to corrupt memory
and may allow execution of arbitrary code. This corruption takes place
during the error handling routines within __sys_recvmmsg() function.
(CVE-2016-7117, Important)

Bug Fix(es) :

* Previously, guest virtual machines (VMs) on a Hyper-V server cluster
got in some cases rebooted during the graceful node failover test,
because the host kept sending heartbeat packets independently of
guests responding to them. This update fixes the bug by properly
responding to all the heartbeat messages in the queue, even if they
are pending. As a result, guest VMs no longer get rebooted under the
described circumstances. (BZ#1397737)

* From Red Hat Enterprise Linux 6.6 to 6.8, the IPv6 routing cache
occasionally showed incorrect values. This update fixes the
DST_NOCOUNT mechanism, and the IPv6 routing cache now shows correct
values. (BZ#1391973)

* Previously, memory corruption by copying data into the wrong memory
locations sometimes occurred, because the __copy_tofrom_user()
function was returning incorrect values. This update fixes the
__copy_tofrom_user() function so that it no longer returns larger
values than the number of bytes it was asked to copy. As a result,
memory corruption no longer occurs in he described scenario.
(BZ#1398182)

See also :

https://www.redhat.com/security/data/cve/CVE-2016-7117.html
http://rhn.redhat.com/errata/RHSA-2017-0031.html

Solution :

Update the affected packages.

Risk factor :

Critical / CVSS Base Score : 10.0
(CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C)
CVSS Temporal Score : 7.4
(CVSS2#E:U/RL:OF/RC:C)
Public Exploit Available : false

Family: Red Hat Local Security Checks

Nessus Plugin ID: 96402 ()

Bugtraq ID:

CVE ID: CVE-2016-7117

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