[RHSA-2016:1664-01] Important: kernel security and bug fix update

[news 28]

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Red Hat Security Advisory

 

Synopsis: Important: kernel security and bug fix update

Advisory ID: RHSA-2016:1664-01

Product: Red Hat Enterprise Linux

Advisory URL: https://rhn.redhat.com/errata/RHSA-2016-1664.html

Issue date: 2016-08-23

CVE Names: CVE-2016-5696

=====================================================================

 

1. Summary:

 

An update for kernel is now available for Red Hat Enterprise Linux 6.

 

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 Desktop (v. 6) - i386, noarch, x86_64

Red Hat Enterprise Linux Desktop Optional (v. 6) - i386, x86_64

Red Hat Enterprise Linux HPC Node (v. 6) - noarch, x86_64

Red Hat Enterprise Linux HPC Node Optional (v. 6) - x86_64

Red Hat Enterprise Linux Server (v. 6) - i386, noarch, ppc64, s390x, x86_64

Red Hat Enterprise Linux Server Optional (v. 6) - i386, ppc64, s390x, x86_64

Red Hat Enterprise Linux Workstation (v. 6) - i386, noarch, x86_64

Red Hat Enterprise Linux Workstation Optional (v. 6) - i386, x86_64

 

3. Description:

 

The kernel packages contain the Linux kernel, the core of any Linux

operating system.

 

Security Fix(es):

 

It was found that the RFC 5961 challenge ACK rate limiting as implemented

in the Linux kernel's networking subsystem allowed an off-path attacker to

leak certain information about a given connection by creating congestion on

the global challenge ACK rate limit counter and then measuring the changes

by probing packets. An off-path attacker could use this flaw to either

terminate TCP connection and/or inject payload into non-secured TCP

connection between two endpoints on the network. (CVE-2016-5696, Important)

 

Red Hat would like to thank Yue Cao (Cyber Security Group of the CS

department of University of California in Riverside) for reporting this

issue.

 

Bug Fix(es):

 

* When loading the Direct Rendering Manager (DRM) kernel module, the kernel

panicked if DRM was previously unloaded. The kernel panic was caused by a

memory leak of the ID Resolver (IDR2). With this update, IDR2 is loaded

during kernel boot, and the kernel panic no longer occurs in the described

scenario. (BZ#1353827)

 

* When more than one process attempted to use the "configfs" directory

entry at the same time, a kernel panic in some cases occurred. With this

update, a race condition between a directory entry and a lookup operation

has been fixed. As a result, the kernel no longer panics in the described

scenario. (BZ#1353828)

 

* When shutting down the system by running the halt -p command, a kernel

panic occurred due to a conflict between the kernel offlining CPUs and the

sched command, which used the sched group and the sched domain data without

first checking the data. The underlying source code has been fixed by

adding a check to avoid the conflict. As a result, the described scenario

no longer results in a kernel panic. (BZ#1343894)

 

* In some cases, running the ipmitool command caused a kernel panic due to

a race condition in the ipmi message handler. This update fixes the race

condition, and the kernel panic no longer occurs in the described scenario.

(BZ#1355980)

 

* Previously, multiple Very Secure FTP daemon (vsftpd) processes on a

directory with a large number of files led to a high contention rate on

each inode's spinlock, which caused excessive CPU usage. With this update,

a spinlock to protect a single memory-to-memory copy has been removed from

the ext4_getattr() function. As a result, system CPU usage has been reduced

and is no longer excessive in the described situation. (BZ#1355981)

 

* When the gfs2_grow utility is used to extend Global File System 2 (GFS2),

the next block allocation causes the GFS2 kernel module to re-read its

resource group index. If multiple processes in the GFS2 module raced to do

the same thing, one process sometimes overwrote a valid object pointer with

an invalid pointer, which caused either a kernel panic or a file system

corruption. This update ensures that the resource group object pointer is

not overwritten. As a result, neither kernel panic nor file system

corruption occur in the described scenario. (BZ#1347539)

 

* Previously, the SCSI Remote Protocol over InfiniBand (IB-SRP) was

disabled due to a bug in the srp_queue() function. As a consequence, an

attempt to enable the Remote Direct Memory Access (RDMA) at boot caused the

kernel to crash. With this update, srp_queue() has been fixed, and the

system now boots as expected when RDMA is enabled. (BZ#1348062)

 

Enhancement(s):

 

* This update optimizes the efficiency of the Transmission Control Protocol

(TCP) when the peer is using a window under 537 bytes in size. As a result,

devices that use maximum segment size (MSS) of 536 bytes or fewer will

experience improved network performance. (BZ#1354446)

 

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/):

 

1354708 - CVE-2016-5696 kernel: challenge ACK counter information disclosure.

 

6. Package List:

 

Red Hat Enterprise Linux Desktop (v. 6):

 

Source:

kernel-2.6.32-642.4.2.el6.src.rpm

 

i386:

kernel-2.6.32-642.4.2.el6.i686.rpm

kernel-debug-2.6.32-642.4.2.el6.i686.rpm

kernel-debug-debuginfo-2.6.32-642.4.2.el6.i686.rpm

kernel-debug-devel-2.6.32-642.4.2.el6.i686.rpm

kernel-debuginfo-2.6.32-642.4.2.el6.i686.rpm

kernel-debuginfo-common-i686-2.6.32-642.4.2.el6.i686.rpm

kernel-devel-2.6.32-642.4.2.el6.i686.rpm

kernel-headers-2.6.32-642.4.2.el6.i686.rpm

perf-2.6.32-642.4.2.el6.i686.rpm

perf-debuginfo-2.6.32-642.4.2.el6.i686.rpm

python-perf-debuginfo-2.6.32-642.4.2.el6.i686.rpm

 

noarch:

kernel-abi-whitelists-2.6.32-642.4.2.el6.noarch.rpm

kernel-doc-2.6.32-642.4.2.el6.noarch.rpm

kernel-firmware-2.6.32-642.4.2.el6.noarch.rpm

 

x86_64:

kernel-2.6.32-642.4.2.el6.x86_64.rpm

kernel-debug-2.6.32-642.4.2.el6.x86_64.rpm

kernel-debug-debuginfo-2.6.32-642.4.2.el6.i686.rpm

kernel-debug-debuginfo-2.6.32-642.4.2.el6.x86_64.rpm

kernel-debug-devel-2.6.32-642.4.2.el6.i686.rpm

kernel-debug-devel-2.6.32-642.4.2.el6.x86_64.rpm

kernel-debuginfo-2.6.32-642.4.2.el6.i686.rpm

kernel-debuginfo-2.6.32-642.4.2.el6.x86_64.rpm

kernel-debuginfo-common-i686-2.6.32-642.4.2.el6.i686.rpm

kernel-debuginfo-common-x86_64-2.6.32-642.4.2.el6.x86_64.rpm

kernel-devel-2.6.32-642.4.2.el6.x86_64.rpm

kernel-headers-2.6.32-642.4.2.el6.x86_64.rpm

perf-2.6.32-642.4.2.el6.x86_64.rpm

perf-debuginfo-2.6.32-642.4.2.el6.i686.rpm

perf-debuginfo-2.6.32-642.4.2.el6.x86_64.rpm

python-perf-debuginfo-2.6.32-642.4.2.el6.i686.rpm

python-perf-debuginfo-2.6.32-642.4.2.el6.x86_64.rpm

 

Red Hat Enterprise Linux Desktop Optional (v. 6):

 

i386:

kernel-debug-debuginfo-2.6.32-642.4.2.el6.i686.rpm

kernel-debuginfo-2.6.32-642.4.2.el6.i686.rpm

kernel-debuginfo-common-i686-2.6.32-642.4.2.el6.i686.rpm

perf-debuginfo-2.6.32-642.4.2.el6.i686.rpm

python-perf-2.6.32-642.4.2.el6.i686.rpm

python-perf-debuginfo-2.6.32-642.4.2.el6.i686.rpm

 

x86_64:

kernel-debug-debuginfo-2.6.32-642.4.2.el6.x86_64.rpm

kernel-debuginfo-2.6.32-642.4.2.el6.x86_64.rpm

kernel-debuginfo-common-x86_64-2.6.32-642.4.2.el6.x86_64.rpm

perf-debuginfo-2.6.32-642.4.2.el6.x86_64.rpm

python-perf-2.6.32-642.4.2.el6.x86_64.rpm

python-perf-debuginfo-2.6.32-642.4.2.el6.x86_64.rpm

 

Red Hat Enterprise Linux HPC Node (v. 6):

 

Source:

kernel-2.6.32-642.4.2.el6.src.rpm

 

noarch:

kernel-abi-whitelists-2.6.32-642.4.2.el6.noarch.rpm

kernel-doc-2.6.32-642.4.2.el6.noarch.rpm

kernel-firmware-2.6.32-642.4.2.el6.noarch.rpm

 

x86_64:

kernel-2.6.32-642.4.2.el6.x86_64.rpm

kernel-debug-2.6.32-642.4.2.el6.x86_64.rpm

kernel-debug-debuginfo-2.6.32-642.4.2.el6.i686.rpm

kernel-debug-debuginfo-2.6.32-642.4.2.el6.x86_64.rpm

kernel-debug-devel-2.6.32-642.4.2.el6.i686.rpm

kernel-debug-devel-2.6.32-642.4.2.el6.x86_64.rpm

kernel-debuginfo-2.6.32-642.4.2.el6.i686.rpm

kernel-debuginfo-2.6.32-642.4.2.el6.x86_64.rpm

kernel-debuginfo-common-i686-2.6.32-642.4.2.el6.i686.rpm

kernel-debuginfo-common-x86_64-2.6.32-642.4.2.el6.x86_64.rpm

kernel-devel-2.6.32-642.4.2.el6.x86_64.rpm

kernel-headers-2.6.32-642.4.2.el6.x86_64.rpm

perf-2.6.32-642.4.2.el6.x86_64.rpm

perf-debuginfo-2.6.32-642.4.2.el6.i686.rpm

perf-debuginfo-2.6.32-642.4.2.el6.x86_64.rpm

python-perf-debuginfo-2.6.32-642.4.2.el6.i686.rpm

python-perf-debuginfo-2.6.32-642.4.2.el6.x86_64.rpm

 

Red Hat Enterprise Linux HPC Node Optional (v. 6):

 

x86_64:

kernel-debug-debuginfo-2.6.32-642.4.2.el6.x86_64.rpm

kernel-debuginfo-2.6.32-642.4.2.el6.x86_64.rpm

kernel-debuginfo-common-x86_64-2.6.32-642.4.2.el6.x86_64.rpm

perf-debuginfo-2.6.32-642.4.2.el6.x86_64.rpm

python-perf-2.6.32-642.4.2.el6.x86_64.rpm

python-perf-debuginfo-2.6.32-642.4.2.el6.x86_64.rpm

 

Red Hat Enterprise Linux Server (v. 6):

 

Source:

kernel-2.6.32-642.4.2.el6.src.rpm

 

i386:

kernel-2.6.32-642.4.2.el6.i686.rpm

kernel-debug-2.6.32-642.4.2.el6.i686.rpm

kernel-debug-debuginfo-2.6.32-642.4.2.el6.i686.rpm

kernel-debug-devel-2.6.32-642.4.2.el6.i686.rpm

kernel-debuginfo-2.6.32-642.4.2.el6.i686.rpm

kernel-debuginfo-common-i686-2.6.32-642.4.2.el6.i686.rpm

kernel-devel-2.6.32-642.4.2.el6.i686.rpm

kernel-headers-2.6.32-642.4.2.el6.i686.rpm

perf-2.6.32-642.4.2.el6.i686.rpm

perf-debuginfo-2.6.32-642.4.2.el6.i686.rpm

python-perf-debuginfo-2.6.32-642.4.2.el6.i686.rpm

 

noarch:

kernel-abi-whitelists-2.6.32-642.4.2.el6.noarch.rpm

kernel-doc-2.6.32-642.4.2.el6.noarch.rpm

kernel-firmware-2.6.32-642.4.2.el6.noarch.rpm

 

ppc64:

kernel-2.6.32-642.4.2.el6.ppc64.rpm

kernel-bootwrapper-2.6.32-642.4.2.el6.ppc64.rpm

kernel-debug-2.6.32-642.4.2.el6.ppc64.rpm

kernel-debug-debuginfo-2.6.32-642.4.2.el6.ppc64.rpm

kernel-debug-devel-2.6.32-642.4.2.el6.ppc64.rpm

kernel-debuginfo-2.6.32-642.4.2.el6.ppc64.rpm

kernel-debuginfo-common-ppc64-2.6.32-642.4.2.el6.ppc64.rpm

kernel-devel-2.6.32-642.4.2.el6.ppc64.rpm

kernel-headers-2.6.32-642.4.2.el6.ppc64.rpm

perf-2.6.32-642.4.2.el6.ppc64.rpm

perf-debuginfo-2.6.32-642.4.2.el6.ppc64.rpm

python-perf-debuginfo-2.6.32-642.4.2.el6.ppc64.rpm

 

s390x:

kernel-2.6.32-642.4.2.el6.s390x.rpm

kernel-debug-2.6.32-642.4.2.el6.s390x.rpm

kernel-debug-debuginfo-2.6.32-642.4.2.el6.s390x.rpm

kernel-debug-devel-2.6.32-642.4.2.el6.s390x.rpm

kernel-debuginfo-2.6.32-642.4.2.el6.s390x.rpm

kernel-debuginfo-common-s390x-2.6.32-642.4.2.el6.s390x.rpm

kernel-devel-2.6.32-642.4.2.el6.s390x.rpm

kernel-headers-2.6.32-642.4.2.el6.s390x.rpm

kernel-kdump-2.6.32-642.4.2.el6.s390x.rpm

kernel-kdump-debuginfo-2.6.32-642.4.2.el6.s390x.rpm

kernel-kdump-devel-2.6.32-642.4.2.el6.s390x.rpm

perf-2.6.32-642.4.2.el6.s390x.rpm

perf-debuginfo-2.6.32-642.4.2.el6.s390x.rpm

python-perf-debuginfo-2.6.32-642.4.2.el6.s390x.rpm

 

x86_64:

kernel-2.6.32-642.4.2.el6.x86_64.rpm

kernel-debug-2.6.32-642.4.2.el6.x86_64.rpm

kernel-debug-debuginfo-2.6.32-642.4.2.el6.i686.rpm

kernel-debug-debuginfo-2.6.32-642.4.2.el6.x86_64.rpm

kernel-debug-devel-2.6.32-642.4.2.el6.i686.rpm

kernel-debug-devel-2.6.32-642.4.2.el6.x86_64.rpm

kernel-debuginfo-2.6.32-642.4.2.el6.i686.rpm

kernel-debuginfo-2.6.32-642.4.2.el6.x86_64.rpm

kernel-debuginfo-common-i686-2.6.32-642.4.2.el6.i686.rpm

kernel-debuginfo-common-x86_64-2.6.32-642.4.2.el6.x86_64.rpm

kernel-devel-2.6.32-642.4.2.el6.x86_64.rpm

kernel-headers-2.6.32-642.4.2.el6.x86_64.rpm

perf-2.6.32-642.4.2.el6.x86_64.rpm

perf-debuginfo-2.6.32-642.4.2.el6.i686.rpm

perf-debuginfo-2.6.32-642.4.2.el6.x86_64.rpm

python-perf-debuginfo-2.6.32-642.4.2.el6.i686.rpm

python-perf-debuginfo-2.6.32-642.4.2.el6.x86_64.rpm

 

Red Hat Enterprise Linux Server Optional (v. 6):

 

i386:

kernel-debug-debuginfo-2.6.32-642.4.2.el6.i686.rpm

kernel-debuginfo-2.6.32-642.4.2.el6.i686.rpm

kernel-debuginfo-common-i686-2.6.32-642.4.2.el6.i686.rpm

perf-debuginfo-2.6.32-642.4.2.el6.i686.rpm

python-perf-2.6.32-642.4.2.el6.i686.rpm

python-perf-debuginfo-2.6.32-642.4.2.el6.i686.rpm

 

ppc64:

kernel-debug-debuginfo-2.6.32-642.4.2.el6.ppc64.rpm

kernel-debuginfo-2.6.32-642.4.2.el6.ppc64.rpm

kernel-debuginfo-common-ppc64-2.6.32-642.4.2.el6.ppc64.rpm

perf-debuginfo-2.6.32-642.4.2.el6.ppc64.rpm

python-perf-2.6.32-642.4.2.el6.ppc64.rpm

python-perf-debuginfo-2.6.32-642.4.2.el6.ppc64.rpm

 

s390x:

kernel-debug-debuginfo-2.6.32-642.4.2.el6.s390x.rpm

kernel-debuginfo-2.6.32-642.4.2.el6.s390x.rpm

kernel-debuginfo-common-s390x-2.6.32-642.4.2.el6.s390x.rpm

kernel-kdump-debuginfo-2.6.32-642.4.2.el6.s390x.rpm

perf-debuginfo-2.6.32-642.4.2.el6.s390x.rpm

python-perf-2.6.32-642.4.2.el6.s390x.rpm

python-perf-debuginfo-2.6.32-642.4.2.el6.s390x.rpm

 

x86_64:

kernel-debug-debuginfo-2.6.32-642.4.2.el6.x86_64.rpm

kernel-debuginfo-2.6.32-642.4.2.el6.x86_64.rpm

kernel-debuginfo-common-x86_64-2.6.32-642.4.2.el6.x86_64.rpm

perf-debuginfo-2.6.32-642.4.2.el6.x86_64.rpm

python-perf-2.6.32-642.4.2.el6.x86_64.rpm

python-perf-debuginfo-2.6.32-642.4.2.el6.x86_64.rpm

 

Red Hat Enterprise Linux Workstation (v. 6):

 

Source:

kernel-2.6.32-642.4.2.el6.src.rpm

 

i386:

kernel-2.6.32-642.4.2.el6.i686.rpm

kernel-debug-2.6.32-642.4.2.el6.i686.rpm

kernel-debug-debuginfo-2.6.32-642.4.2.el6.i686.rpm

kernel-debug-devel-2.6.32-642.4.2.el6.i686.rpm

kernel-debuginfo-2.6.32-642.4.2.el6.i686.rpm

kernel-debuginfo-common-i686-2.6.32-642.4.2.el6.i686.rpm

kernel-devel-2.6.32-642.4.2.el6.i686.rpm

kernel-headers-2.6.32-642.4.2.el6.i686.rpm

perf-2.6.32-642.4.2.el6.i686.rpm

perf-debuginfo-2.6.32-642.4.2.el6.i686.rpm

python-perf-debuginfo-2.6.32-642.4.2.el6.i686.rpm

 

noarch:

kernel-abi-whitelists-2.6.32-642.4.2.el6.noarch.rpm

kernel-doc-2.6.32-642.4.2.el6.noarch.rpm

kernel-firmware-2.6.32-642.4.2.el6.noarch.rpm

 

x86_64:

kernel-2.6.32-642.4.2.el6.x86_64.rpm

kernel-debug-2.6.32-642.4.2.el6.x86_64.rpm

kernel-debug-debuginfo-2.6.32-642.4.2.el6.i686.rpm

kernel-debug-debuginfo-2.6.32-642.4.2.el6.x86_64.rpm

kernel-debug-devel-2.6.32-642.4.2.el6.i686.rpm

kernel-debug-devel-2.6.32-642.4.2.el6.x86_64.rpm

kernel-debuginfo-2.6.32-642.4.2.el6.i686.rpm

kernel-debuginfo-2.6.32-642.4.2.el6.x86_64.rpm

kernel-debuginfo-common-i686-2.6.32-642.4.2.el6.i686.rpm

kernel-debuginfo-common-x86_64-2.6.32-642.4.2.el6.x86_64.rpm

kernel-devel-2.6.32-642.4.2.el6.x86_64.rpm

kernel-headers-2.6.32-642.4.2.el6.x86_64.rpm

perf-2.6.32-642.4.2.el6.x86_64.rpm

perf-debuginfo-2.6.32-642.4.2.el6.i686.rpm

perf-debuginfo-2.6.32-642.4.2.el6.x86_64.rpm

python-perf-debuginfo-2.6.32-642.4.2.el6.i686.rpm

python-perf-debuginfo-2.6.32-642.4.2.el6.x86_64.rpm

 

Red Hat Enterprise Linux Workstation Optional (v. 6):

 

i386:

kernel-debug-debuginfo-2.6.32-642.4.2.el6.i686.rpm

kernel-debuginfo-2.6.32-642.4.2.el6.i686.rpm

kernel-debuginfo-common-i686-2.6.32-642.4.2.el6.i686.rpm

perf-debuginfo-2.6.32-642.4.2.el6.i686.rpm

python-perf-2.6.32-642.4.2.el6.i686.rpm

python-perf-debuginfo-2.6.32-642.4.2.el6.i686.rpm

 

x86_64:

kernel-debug-debuginfo-2.6.32-642.4.2.el6.x86_64.rpm

kernel-debuginfo-2.6.32-642.4.2.el6.x86_64.rpm

kernel-debuginfo-common-x86_64-2.6.32-642.4.2.el6.x86_64.rpm

perf-debuginfo-2.6.32-642.4.2.el6.x86_64.rpm

python-perf-2.6.32-642.4.2.el6.x86_64.rpm

python-perf-debuginfo-2.6.32-642.4.2.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-2016-5696

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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