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=====================================================================
                   Red Hat Security Advisory

Synopsis:          Important: kernel security and bug fix update
Advisory ID:       RHSA-2016:1225-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2016:1225
Issue date:        2016-06-14
CVE Names:         CVE-2015-5364 CVE-2015-5366 
=====================================================================

1. Summary:

An update for kernel is now available for Red Hat Enterprise Linux 6.5
Advanced 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.

2. Relevant releases/architectures:

Red Hat Enterprise Linux Server AUS (v. 6.5) - noarch, x86_64
Red Hat Enterprise Linux Server Optional AUS (v. 6.5) - x86_64

3. Description:

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):

* At a process or thread exit, when the Linux kernel undoes any SysV
semaphore operations done previously (ones done using semop with the
SEM_UNDO flag), there was a possible race condition with another process or
thread removing the same semaphore set where the operations occurred,
leading to a possible use of in-kernel-freed memory and then to possible
unpredictable behavior. This bug could be noticed with software which uses
IPC SysV semaphores, such as IBM DB2, which could in certain cases have
some of its processes or utilities get incorrectly stalled in an IPC
semaphore operation or system call after the race condition happened. A
patch has been provided to fix this bug, and the kernel now behaves as
expected in the aforementioned scenario. (BZ#1326343)

4. Solution:

For details on how to apply this update, which includes the changes
described in this advisory, refer to:

https://access.redhat.com/articles/11258

The system must be rebooted for this update to take effect.

5. Bugs fixed (https://bugzilla.redhat.com/):

1239029 - CVE-2015-5366 CVE-2015-5364 kernel: net: incorrect processing of checksums in UDP implementation

6. Package List:

Red Hat Enterprise Linux Server AUS (v. 6.5):

Source:
kernel-2.6.32-431.72.1.el6.src.rpm

noarch:
kernel-abi-whitelists-2.6.32-431.72.1.el6.noarch.rpm
kernel-doc-2.6.32-431.72.1.el6.noarch.rpm
kernel-firmware-2.6.32-431.72.1.el6.noarch.rpm

x86_64:
kernel-2.6.32-431.72.1.el6.x86_64.rpm
kernel-debug-2.6.32-431.72.1.el6.x86_64.rpm
kernel-debug-debuginfo-2.6.32-431.72.1.el6.x86_64.rpm
kernel-debug-devel-2.6.32-431.72.1.el6.x86_64.rpm
kernel-debuginfo-2.6.32-431.72.1.el6.x86_64.rpm
kernel-debuginfo-common-x86_64-2.6.32-431.72.1.el6.x86_64.rpm
kernel-devel-2.6.32-431.72.1.el6.x86_64.rpm
kernel-headers-2.6.32-431.72.1.el6.x86_64.rpm
perf-2.6.32-431.72.1.el6.x86_64.rpm
perf-debuginfo-2.6.32-431.72.1.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-431.72.1.el6.x86_64.rpm

Red Hat Enterprise Linux Server Optional AUS (v. 6.5):

Source:
kernel-2.6.32-431.72.1.el6.src.rpm

x86_64:
kernel-debug-debuginfo-2.6.32-431.72.1.el6.x86_64.rpm
kernel-debuginfo-2.6.32-431.72.1.el6.x86_64.rpm
kernel-debuginfo-common-x86_64-2.6.32-431.72.1.el6.x86_64.rpm
perf-debuginfo-2.6.32-431.72.1.el6.x86_64.rpm
python-perf-2.6.32-431.72.1.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-431.72.1.el6.x86_64.rpm

These packages are GPG signed by Red Hat for security.  Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/

7. References:

https://access.redhat.com/security/cve/CVE-2015-5364
https://access.redhat.com/security/cve/CVE-2015-5366
https://access.redhat.com/security/updates/classification/#important

8. Contact:

The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2016 Red Hat, Inc.
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