Protect yourself against future threats.
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===========================================================================
AUSCERT External Security Bulletin Redistribution
ESB-2017.0939
Important: kernel security and bug fix update
12 April 2017
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: kernel
Publisher: Red Hat
Operating System: Red Hat Enterprise Linux Server 6
Red Hat Enterprise Linux WS/Desktop 6
Impact/Access: Root Compromise -- Existing Account
Denial of Service -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2017-2636 CVE-2016-7910
Reference: ESB-2017.0881
ESB-2017.0497
Original Bulletin:
https://access.redhat.com/errata/RHSA-2017:0892
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=====================================================================
Red Hat Security Advisory
Synopsis: Important: kernel security and bug fix update
Advisory ID: RHSA-2017:0892-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2017:0892
Issue date: 2017-04-11
CVE Names: CVE-2016-7910 CVE-2017-2636
=====================================================================
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):
* A race condition flaw was found in the N_HLDC Linux kernel driver when
accessing n_hdlc.tbuf list that can lead to double free. A local,
unprivileged user able to set the HDLC line discipline on the tty device
could use this flaw to increase their privileges on the system.
(CVE-2017-2636, Important)
* A flaw was found in the Linux kernel's implementation of seq_file where a
local attacker could manipulate memory in the put() function pointer. This
could lead to memory corruption and possible privileged escalation.
(CVE-2016-7910, Moderate)
Red Hat would like to thank Alexander Popov for reporting CVE-2017-2636.
Bug Fix(es):
* Previously, Chelsio firmware included an incorrectly-formatted firmware
bin file. As a consequence, the firmware could not be flashed. This update
provides a firmware bin file that is formatted correctly. As a result,
Chelsio firmware can now be flashed successfully. (BZ#1433865)
* When multiple simultaneous processes attempted to read from the
/proc/stat file, spinlock overhead was generated on Non-Uniform Memory
Access (NUMA) systems. Consequently, a large amount of CPU was consumed.
With this update, the underlying source code has been fixed to avoid taking
spinlock when the interrupt line does not exist. As a result, the spinlock
overhead is now generated less often, and multiple simultaneous processes
can now read /proc/stat without consuming a large amount of CPU.
(BZ#1428106)
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/):
1399727 - CVE-2016-7910 kernel: Use after free in seq file
1428319 - CVE-2017-2636 kernel: Race condition access to n_hdlc.tbuf causes double free in n_hdlc_release()
6. Package List:
Red Hat Enterprise Linux Desktop (v. 6):
Source:
kernel-2.6.32-696.1.1.el6.src.rpm
i386:
kernel-2.6.32-696.1.1.el6.i686.rpm
kernel-debug-2.6.32-696.1.1.el6.i686.rpm
kernel-debug-debuginfo-2.6.32-696.1.1.el6.i686.rpm
kernel-debug-devel-2.6.32-696.1.1.el6.i686.rpm
kernel-debuginfo-2.6.32-696.1.1.el6.i686.rpm
kernel-debuginfo-common-i686-2.6.32-696.1.1.el6.i686.rpm
kernel-devel-2.6.32-696.1.1.el6.i686.rpm
kernel-headers-2.6.32-696.1.1.el6.i686.rpm
perf-2.6.32-696.1.1.el6.i686.rpm
perf-debuginfo-2.6.32-696.1.1.el6.i686.rpm
python-perf-debuginfo-2.6.32-696.1.1.el6.i686.rpm
noarch:
kernel-abi-whitelists-2.6.32-696.1.1.el6.noarch.rpm
kernel-doc-2.6.32-696.1.1.el6.noarch.rpm
kernel-firmware-2.6.32-696.1.1.el6.noarch.rpm
x86_64:
kernel-2.6.32-696.1.1.el6.x86_64.rpm
kernel-debug-2.6.32-696.1.1.el6.x86_64.rpm
kernel-debug-debuginfo-2.6.32-696.1.1.el6.i686.rpm
kernel-debug-debuginfo-2.6.32-696.1.1.el6.x86_64.rpm
kernel-debug-devel-2.6.32-696.1.1.el6.i686.rpm
kernel-debug-devel-2.6.32-696.1.1.el6.x86_64.rpm
kernel-debuginfo-2.6.32-696.1.1.el6.i686.rpm
kernel-debuginfo-2.6.32-696.1.1.el6.x86_64.rpm
kernel-debuginfo-common-i686-2.6.32-696.1.1.el6.i686.rpm
kernel-debuginfo-common-x86_64-2.6.32-696.1.1.el6.x86_64.rpm
kernel-devel-2.6.32-696.1.1.el6.x86_64.rpm
kernel-headers-2.6.32-696.1.1.el6.x86_64.rpm
perf-2.6.32-696.1.1.el6.x86_64.rpm
perf-debuginfo-2.6.32-696.1.1.el6.i686.rpm
perf-debuginfo-2.6.32-696.1.1.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-696.1.1.el6.i686.rpm
python-perf-debuginfo-2.6.32-696.1.1.el6.x86_64.rpm
Red Hat Enterprise Linux Desktop Optional (v. 6):
i386:
kernel-debug-debuginfo-2.6.32-696.1.1.el6.i686.rpm
kernel-debuginfo-2.6.32-696.1.1.el6.i686.rpm
kernel-debuginfo-common-i686-2.6.32-696.1.1.el6.i686.rpm
perf-debuginfo-2.6.32-696.1.1.el6.i686.rpm
python-perf-2.6.32-696.1.1.el6.i686.rpm
python-perf-debuginfo-2.6.32-696.1.1.el6.i686.rpm
x86_64:
kernel-debug-debuginfo-2.6.32-696.1.1.el6.x86_64.rpm
kernel-debuginfo-2.6.32-696.1.1.el6.x86_64.rpm
kernel-debuginfo-common-x86_64-2.6.32-696.1.1.el6.x86_64.rpm
perf-debuginfo-2.6.32-696.1.1.el6.x86_64.rpm
python-perf-2.6.32-696.1.1.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-696.1.1.el6.x86_64.rpm
Red Hat Enterprise Linux HPC Node (v. 6):
Source:
kernel-2.6.32-696.1.1.el6.src.rpm
noarch:
kernel-abi-whitelists-2.6.32-696.1.1.el6.noarch.rpm
kernel-doc-2.6.32-696.1.1.el6.noarch.rpm
kernel-firmware-2.6.32-696.1.1.el6.noarch.rpm
x86_64:
kernel-2.6.32-696.1.1.el6.x86_64.rpm
kernel-debug-2.6.32-696.1.1.el6.x86_64.rpm
kernel-debug-debuginfo-2.6.32-696.1.1.el6.i686.rpm
kernel-debug-debuginfo-2.6.32-696.1.1.el6.x86_64.rpm
kernel-debug-devel-2.6.32-696.1.1.el6.i686.rpm
kernel-debug-devel-2.6.32-696.1.1.el6.x86_64.rpm
kernel-debuginfo-2.6.32-696.1.1.el6.i686.rpm
kernel-debuginfo-2.6.32-696.1.1.el6.x86_64.rpm
kernel-debuginfo-common-i686-2.6.32-696.1.1.el6.i686.rpm
kernel-debuginfo-common-x86_64-2.6.32-696.1.1.el6.x86_64.rpm
kernel-devel-2.6.32-696.1.1.el6.x86_64.rpm
kernel-headers-2.6.32-696.1.1.el6.x86_64.rpm
perf-2.6.32-696.1.1.el6.x86_64.rpm
perf-debuginfo-2.6.32-696.1.1.el6.i686.rpm
perf-debuginfo-2.6.32-696.1.1.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-696.1.1.el6.i686.rpm
python-perf-debuginfo-2.6.32-696.1.1.el6.x86_64.rpm
Red Hat Enterprise Linux HPC Node Optional (v. 6):
x86_64:
kernel-debug-debuginfo-2.6.32-696.1.1.el6.x86_64.rpm
kernel-debuginfo-2.6.32-696.1.1.el6.x86_64.rpm
kernel-debuginfo-common-x86_64-2.6.32-696.1.1.el6.x86_64.rpm
perf-debuginfo-2.6.32-696.1.1.el6.x86_64.rpm
python-perf-2.6.32-696.1.1.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-696.1.1.el6.x86_64.rpm
Red Hat Enterprise Linux Server (v. 6):
Source:
kernel-2.6.32-696.1.1.el6.src.rpm
i386:
kernel-2.6.32-696.1.1.el6.i686.rpm
kernel-debug-2.6.32-696.1.1.el6.i686.rpm
kernel-debug-debuginfo-2.6.32-696.1.1.el6.i686.rpm
kernel-debug-devel-2.6.32-696.1.1.el6.i686.rpm
kernel-debuginfo-2.6.32-696.1.1.el6.i686.rpm
kernel-debuginfo-common-i686-2.6.32-696.1.1.el6.i686.rpm
kernel-devel-2.6.32-696.1.1.el6.i686.rpm
kernel-headers-2.6.32-696.1.1.el6.i686.rpm
perf-2.6.32-696.1.1.el6.i686.rpm
perf-debuginfo-2.6.32-696.1.1.el6.i686.rpm
python-perf-debuginfo-2.6.32-696.1.1.el6.i686.rpm
noarch:
kernel-abi-whitelists-2.6.32-696.1.1.el6.noarch.rpm
kernel-doc-2.6.32-696.1.1.el6.noarch.rpm
kernel-firmware-2.6.32-696.1.1.el6.noarch.rpm
ppc64:
kernel-2.6.32-696.1.1.el6.ppc64.rpm
kernel-bootwrapper-2.6.32-696.1.1.el6.ppc64.rpm
kernel-debug-2.6.32-696.1.1.el6.ppc64.rpm
kernel-debug-debuginfo-2.6.32-696.1.1.el6.ppc64.rpm
kernel-debug-devel-2.6.32-696.1.1.el6.ppc64.rpm
kernel-debuginfo-2.6.32-696.1.1.el6.ppc64.rpm
kernel-debuginfo-common-ppc64-2.6.32-696.1.1.el6.ppc64.rpm
kernel-devel-2.6.32-696.1.1.el6.ppc64.rpm
kernel-headers-2.6.32-696.1.1.el6.ppc64.rpm
perf-2.6.32-696.1.1.el6.ppc64.rpm
perf-debuginfo-2.6.32-696.1.1.el6.ppc64.rpm
python-perf-debuginfo-2.6.32-696.1.1.el6.ppc64.rpm
s390x:
kernel-2.6.32-696.1.1.el6.s390x.rpm
kernel-debug-2.6.32-696.1.1.el6.s390x.rpm
kernel-debug-debuginfo-2.6.32-696.1.1.el6.s390x.rpm
kernel-debug-devel-2.6.32-696.1.1.el6.s390x.rpm
kernel-debuginfo-2.6.32-696.1.1.el6.s390x.rpm
kernel-debuginfo-common-s390x-2.6.32-696.1.1.el6.s390x.rpm
kernel-devel-2.6.32-696.1.1.el6.s390x.rpm
kernel-headers-2.6.32-696.1.1.el6.s390x.rpm
kernel-kdump-2.6.32-696.1.1.el6.s390x.rpm
kernel-kdump-debuginfo-2.6.32-696.1.1.el6.s390x.rpm
kernel-kdump-devel-2.6.32-696.1.1.el6.s390x.rpm
perf-2.6.32-696.1.1.el6.s390x.rpm
perf-debuginfo-2.6.32-696.1.1.el6.s390x.rpm
python-perf-debuginfo-2.6.32-696.1.1.el6.s390x.rpm
x86_64:
kernel-2.6.32-696.1.1.el6.x86_64.rpm
kernel-debug-2.6.32-696.1.1.el6.x86_64.rpm
kernel-debug-debuginfo-2.6.32-696.1.1.el6.i686.rpm
kernel-debug-debuginfo-2.6.32-696.1.1.el6.x86_64.rpm
kernel-debug-devel-2.6.32-696.1.1.el6.i686.rpm
kernel-debug-devel-2.6.32-696.1.1.el6.x86_64.rpm
kernel-debuginfo-2.6.32-696.1.1.el6.i686.rpm
kernel-debuginfo-2.6.32-696.1.1.el6.x86_64.rpm
kernel-debuginfo-common-i686-2.6.32-696.1.1.el6.i686.rpm
kernel-debuginfo-common-x86_64-2.6.32-696.1.1.el6.x86_64.rpm
kernel-devel-2.6.32-696.1.1.el6.x86_64.rpm
kernel-headers-2.6.32-696.1.1.el6.x86_64.rpm
perf-2.6.32-696.1.1.el6.x86_64.rpm
perf-debuginfo-2.6.32-696.1.1.el6.i686.rpm
perf-debuginfo-2.6.32-696.1.1.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-696.1.1.el6.i686.rpm
python-perf-debuginfo-2.6.32-696.1.1.el6.x86_64.rpm
Red Hat Enterprise Linux Server Optional (v. 6):
i386:
kernel-debug-debuginfo-2.6.32-696.1.1.el6.i686.rpm
kernel-debuginfo-2.6.32-696.1.1.el6.i686.rpm
kernel-debuginfo-common-i686-2.6.32-696.1.1.el6.i686.rpm
perf-debuginfo-2.6.32-696.1.1.el6.i686.rpm
python-perf-2.6.32-696.1.1.el6.i686.rpm
python-perf-debuginfo-2.6.32-696.1.1.el6.i686.rpm
ppc64:
kernel-debug-debuginfo-2.6.32-696.1.1.el6.ppc64.rpm
kernel-debuginfo-2.6.32-696.1.1.el6.ppc64.rpm
kernel-debuginfo-common-ppc64-2.6.32-696.1.1.el6.ppc64.rpm
perf-debuginfo-2.6.32-696.1.1.el6.ppc64.rpm
python-perf-2.6.32-696.1.1.el6.ppc64.rpm
python-perf-debuginfo-2.6.32-696.1.1.el6.ppc64.rpm
s390x:
kernel-debug-debuginfo-2.6.32-696.1.1.el6.s390x.rpm
kernel-debuginfo-2.6.32-696.1.1.el6.s390x.rpm
kernel-debuginfo-common-s390x-2.6.32-696.1.1.el6.s390x.rpm
kernel-kdump-debuginfo-2.6.32-696.1.1.el6.s390x.rpm
perf-debuginfo-2.6.32-696.1.1.el6.s390x.rpm
python-perf-2.6.32-696.1.1.el6.s390x.rpm
python-perf-debuginfo-2.6.32-696.1.1.el6.s390x.rpm
x86_64:
kernel-debug-debuginfo-2.6.32-696.1.1.el6.x86_64.rpm
kernel-debuginfo-2.6.32-696.1.1.el6.x86_64.rpm
kernel-debuginfo-common-x86_64-2.6.32-696.1.1.el6.x86_64.rpm
perf-debuginfo-2.6.32-696.1.1.el6.x86_64.rpm
python-perf-2.6.32-696.1.1.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-696.1.1.el6.x86_64.rpm
Red Hat Enterprise Linux Workstation (v. 6):
Source:
kernel-2.6.32-696.1.1.el6.src.rpm
i386:
kernel-2.6.32-696.1.1.el6.i686.rpm
kernel-debug-2.6.32-696.1.1.el6.i686.rpm
kernel-debug-debuginfo-2.6.32-696.1.1.el6.i686.rpm
kernel-debug-devel-2.6.32-696.1.1.el6.i686.rpm
kernel-debuginfo-2.6.32-696.1.1.el6.i686.rpm
kernel-debuginfo-common-i686-2.6.32-696.1.1.el6.i686.rpm
kernel-devel-2.6.32-696.1.1.el6.i686.rpm
kernel-headers-2.6.32-696.1.1.el6.i686.rpm
perf-2.6.32-696.1.1.el6.i686.rpm
perf-debuginfo-2.6.32-696.1.1.el6.i686.rpm
python-perf-debuginfo-2.6.32-696.1.1.el6.i686.rpm
noarch:
kernel-abi-whitelists-2.6.32-696.1.1.el6.noarch.rpm
kernel-doc-2.6.32-696.1.1.el6.noarch.rpm
kernel-firmware-2.6.32-696.1.1.el6.noarch.rpm
x86_64:
kernel-2.6.32-696.1.1.el6.x86_64.rpm
kernel-debug-2.6.32-696.1.1.el6.x86_64.rpm
kernel-debug-debuginfo-2.6.32-696.1.1.el6.i686.rpm
kernel-debug-debuginfo-2.6.32-696.1.1.el6.x86_64.rpm
kernel-debug-devel-2.6.32-696.1.1.el6.i686.rpm
kernel-debug-devel-2.6.32-696.1.1.el6.x86_64.rpm
kernel-debuginfo-2.6.32-696.1.1.el6.i686.rpm
kernel-debuginfo-2.6.32-696.1.1.el6.x86_64.rpm
kernel-debuginfo-common-i686-2.6.32-696.1.1.el6.i686.rpm
kernel-debuginfo-common-x86_64-2.6.32-696.1.1.el6.x86_64.rpm
kernel-devel-2.6.32-696.1.1.el6.x86_64.rpm
kernel-headers-2.6.32-696.1.1.el6.x86_64.rpm
perf-2.6.32-696.1.1.el6.x86_64.rpm
perf-debuginfo-2.6.32-696.1.1.el6.i686.rpm
perf-debuginfo-2.6.32-696.1.1.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-696.1.1.el6.i686.rpm
python-perf-debuginfo-2.6.32-696.1.1.el6.x86_64.rpm
Red Hat Enterprise Linux Workstation Optional (v. 6):
i386:
kernel-debug-debuginfo-2.6.32-696.1.1.el6.i686.rpm
kernel-debuginfo-2.6.32-696.1.1.el6.i686.rpm
kernel-debuginfo-common-i686-2.6.32-696.1.1.el6.i686.rpm
perf-debuginfo-2.6.32-696.1.1.el6.i686.rpm
python-perf-2.6.32-696.1.1.el6.i686.rpm
python-perf-debuginfo-2.6.32-696.1.1.el6.i686.rpm
x86_64:
kernel-debug-debuginfo-2.6.32-696.1.1.el6.x86_64.rpm
kernel-debuginfo-2.6.32-696.1.1.el6.x86_64.rpm
kernel-debuginfo-common-x86_64-2.6.32-696.1.1.el6.x86_64.rpm
perf-debuginfo-2.6.32-696.1.1.el6.x86_64.rpm
python-perf-2.6.32-696.1.1.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-696.1.1.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-2016-7910
https://access.redhat.com/security/cve/CVE-2017-2636
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 2017 Red Hat, Inc.
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