RHEL 6 : kernel (RHSA-2015:2645)

This script is Copyright (C) 2015-2017 Tenable Network Security, Inc.


Synopsis :

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

Description :

Updated kernel packages that fix two security issues and two bugs are
now available for Red Hat Enterprise Linux 6.5 Advanced Update
Support.

Red Hat Product Security has rated this update as having Important
security impact. Common Vulnerability Scoring System (CVSS) base
scores, which give detailed severity ratings, are available for each
vulnerability from the CVE links in the References section.

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

* It was found that the x86 ISA (Instruction Set Architecture) is
prone to a denial of service attack inside a virtualized environment
in the form of an infinite loop in the microcode due to the way
(sequential) delivering of benign exceptions such as #AC (alignment
check exception) and #DB (debug exception) is handled. A privileged
user inside a guest could use these flaws to create denial of service
conditions on the host kernel. (CVE-2015-5307, CVE-2015-8104,
Important)

Red Hat would like to thank Ben Serebrin of Google Inc. for reporting
the CVE-2015-5307 issue.

This update also fixes the following bugs :

* With an IPv6 address on a bond and a slave failover, Unsolicited
Neighbor Advertisement (UNA) was previously sent using the link global
IPv6 address as source address. The underlying source code has been
patched, and, after the failover in bonding, UNA is sent using both
the corresponding link IPv6 address and global IPv6 address of bond0
and bond0.vlan. (BZ#1258479)

* Previously, Human Interface Device (HID) would run a report on an
unaligned buffer, which could cause a page fault interrupt and an oops
when the end of the report was read. This update fixes this bug by
padding the end of the report with extra bytes, so the reading of the
report never crosses a page boundary. As a result, a page fault and
subsequent oops no longer occur. (BZ#1268201)

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 :

https://www.redhat.com/security/data/cve/CVE-2015-5307.html
https://www.redhat.com/security/data/cve/CVE-2015-8104.html
http://rhn.redhat.com/errata/RHSA-2015-2645.html

Solution :

Update the affected packages.

Risk factor :

Medium / CVSS Base Score : 4.9
(CVSS2#AV:L/AC:L/Au:N/C:N/I:N/A:C)
CVSS Temporal Score : 4.7
(CVSS2#E:F/RL:U/RC:ND)
Public Exploit Available : true

Family: Red Hat Local Security Checks

Nessus Plugin ID: 87399 ()

Bugtraq ID:

CVE ID: CVE-2015-5307
CVE-2015-8104

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