Scientific Linux: SLSA-2017:0892-1 Important: Kernel Memory Corruption Risk

Date: Tue, 11 Apr 2017 18:47:10 -0000
Reply-To: scientific-linux-users@
Sender: Security Errata for Scientific Linux
 
From: Pat Riehecky 
Subject: Security ERRATA Important: kernel on SL6.x i386/x86_64
MIME-Version: 1.0
Message-ID: <20170411184710.27262.325@slpackages.fnal.gov>

Synopsis: Important: kernel security and bug fix update
Advisory ID: SLSA-2017:0892-1
Issue Date: 2017-04-11
CVE Numbers: CVE-2016-7910
 CVE-2017-2636
--

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)

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.

* 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.
--

SL6
 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
 python-perf-2.6.32-696.1.1.el6.x86_64.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
 python-perf-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

- Scientific Linux Development Team