RHEL 6 : kernel (RHSA-2016:1100)

This script is Copyright (C) 2016-2017 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 6.6
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) :

* Two flaws were found in the way the Linux kernel's networking
implementation handled UDP packets with incorrect checksum values. A
remote attacker could potentially use these flaws to trigger an
infinite loop in the kernel, resulting in a denial of service on the
system, or cause a denial of service in applications using the edge
triggered epoll functionality. (CVE-2015-5364, CVE-2015-5366,
Important)

Bug Fix(es) :

* In anon_vma data structure, the degree counts number of child
anon_vmas and of VMAs that point to this anon_vma. In the
unlink_anon_vma() function, when its list is empty, anon_vma is going
to be freed whether the external refcount is zero or not, so the
parent's degree should be decremented. However, failure to decrement
the degree triggered a BUG_ON() signal in unlink_anon_vma(). The
provided patch fixes this bug, and the degree is now decremented as
expected. (BZ#1326027)

Enhancement(s) :

* The ixgbe NIC driver has been upgraded to upstream version 4.2.1,
which provides a number of bug fixes and enhancements over the
previous version. Notably :

NULL pointer crashes related to VLAN support have been fixed

Two more devices from the Intel X550 Ethernet controller family are
now supported: IDs 15AC and 15AD

Several PHY-related problems have been addressed: link disruptions and
link flapping

Added PHY-related support for Intel X550

System performance has been improved

(BZ#1315702)

See also :

https://www.redhat.com/security/data/cve/CVE-2015-5364.html
https://www.redhat.com/security/data/cve/CVE-2015-5366.html
http://rhn.redhat.com/errata/RHSA-2016-1100.html

Solution :

Update the affected packages.

Risk factor :

High / CVSS Base Score : 7.8
(CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C)
CVSS Temporal Score : 5.8
(CVSS2#E:U/RL:OF/RC:C)
Public Exploit Available : false

Family: Red Hat Local Security Checks

Nessus Plugin ID: 91317 ()

Bugtraq ID:

CVE ID: CVE-2015-5364
CVE-2015-5366

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