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Red Hat Security Advisory

 

Synopsis: Important: kernel security and bug fix update

Advisory ID: RHSA-2016:1096-01

Product: Red Hat Enterprise Linux

Advisory URL: https://rhn.redhat.com/errata/RHSA-2016-1096.html

Issue date: 2016-05-23

CVE Names: CVE-2015-5364 CVE-2015-5366

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1. Summary:

 

An update for kernel is now available for Red Hat Enterprise Linux 6.4

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. 6.4) - noarch, x86_64

Red Hat Enterprise Linux Server Optional AUS (v. 6.4) - 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):

 

* Prior to this update, if processes that generate interrupts were active

during the guest shutdown sequence, the virtio driver in some cases did not

correctly clear the interrupts. As a consequence, the guest kernel became

unresponsive, which prevented the shutdown from completing. With this

update, the virtio driver processes interrupts more effectively, and guests

now shut down reliably in the described scenario. (BZ#1323568)

 

* At a process or thread exit, when the Linux kernel undoes any SysV

semaphore operations done previously (the ones done using semop with the

SEM_UNDO flag), there was a possible flaw and race with another process or

thread removing the same semaphore set where the operations occurred,

leading to 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 for example in certain cases

could lead to some of its processes or utilities to get incorrectly stalled

in some IPC semaphore operation or syscall after the race or problem

happened. A patch has been provided to fix this bug, and the kernel now

behaves as expected in the aforementioned scenario. (BZ#1326341)

 

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. 6.4):

 

Source:

kernel-2.6.32-358.71.1.el6.src.rpm

 

noarch:

kernel-doc-2.6.32-358.71.1.el6.noarch.rpm

kernel-firmware-2.6.32-358.71.1.el6.noarch.rpm

 

x86_64:

kernel-2.6.32-358.71.1.el6.x86_64.rpm

kernel-debug-2.6.32-358.71.1.el6.x86_64.rpm

kernel-debug-debuginfo-2.6.32-358.71.1.el6.x86_64.rpm

kernel-debug-devel-2.6.32-358.71.1.el6.x86_64.rpm

kernel-debuginfo-2.6.32-358.71.1.el6.x86_64.rpm

kernel-debuginfo-common-x86_64-2.6.32-358.71.1.el6.x86_64.rpm

kernel-devel-2.6.32-358.71.1.el6.x86_64.rpm

kernel-headers-2.6.32-358.71.1.el6.x86_64.rpm

perf-2.6.32-358.71.1.el6.x86_64.rpm

perf-debuginfo-2.6.32-358.71.1.el6.x86_64.rpm

python-perf-debuginfo-2.6.32-358.71.1.el6.x86_64.rpm

 

Red Hat Enterprise Linux Server Optional AUS (v. 6.4):

 

Source:

kernel-2.6.32-358.71.1.el6.src.rpm

 

x86_64:

kernel-debug-debuginfo-2.6.32-358.71.1.el6.x86_64.rpm

kernel-debuginfo-2.6.32-358.71.1.el6.x86_64.rpm

kernel-debuginfo-common-x86_64-2.6.32-358.71.1.el6.x86_64.rpm

perf-debuginfo-2.6.32-358.71.1.el6.x86_64.rpm

python-perf-2.6.32-358.71.1.el6.x86_64.rpm

python-perf-debuginfo-2.6.32-358.71.1.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 . More contact

details at https://access.redhat.com/security/team/contact/

 

Copyright 2016 Red Hat, Inc.

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