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Red Hat Security Advisory

Synopsis: Moderate: kernel security and bug fix update
Advisory ID: RHSA-2017:0307-01
Product: Red Hat Enterprise Linux
Advisory URL: https://rhn.redhat.com/errata/RHSA-2017-0307.html
Issue date: 2017-02-23
CVE Names: CVE-2016-6136 CVE-2016-9555
=====================================================================

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 Moderate. 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):

* When creating audit records for parameters to executed children
processes, an attacker can convince the Linux kernel audit subsystem can
create corrupt records which may allow an attacker to misrepresent or evade
logging of executing commands. (CVE-2016-6136, Moderate)

* A flaw was found in the Linux kernel’s implementation of the SCTP
protocol. A remote attacker could trigger an out-of-bounds read with an
offset of up to 64kB potentially causing the system to crash.
(CVE-2016-9555, Moderate)

Bug Fix(es):

* The qlnic driver previously attempted to fetch pending transmission
descriptors before all writes were complete, which lead to firmware hangs.
With this update, the qlcnic driver has been fixed to complete all writes
before the hardware fetches any pending transmission descriptors. As a
result, the firmware no longer hangs with the qlcnic driver. (BZ#1403143)

* Previously, when a NFS share was mounted, the file-system (FS) cache was
incorrectly enabled even when the “-o fsc” option was not used in the mount
command. Consequently, the cachefilesd service stored files in the NFS
share even when not instructed to by the user. With this update, NFS does
not use the FS cache if not instructed by the “-o fsc” option. As a result,
NFS no longer enables caching if the “-o fsc” option is not used.
(BZ#1399172)

* Previously, an NFS client and NFS server got into a NFS4 protocol loop
involving a WRITE action and a NFS4ERR_EXPIRED response when the
current_fileid counter got to the wraparound point by overflowing the value
of 32 bits. This update fixes the NFS server to handle the current_fileid
wraparound. As a result, the described NFS4 protocol loop no longer occurs.
(BZ#1399174)

* Previously, certain configurations of the Hewlett Packard Smart Array
(HPSA) devices caused hardware to be set offline incorrectly when the HPSA
driver was expected to wait for existing I/O operations to complete.
Consequently, a kernel panic occurred. This update prevents the described
problem. As a result, the kernel panic no longer occurs. (BZ#1399175)

* Previously, memory corruption by copying data into the wrong memory
locations sometimes occurred, because the __copy_tofrom_user() function was
returning incorrect values. This update fixes the __copy_tofrom_user()
function so that it no longer returns larger values than the number of
bytes it was asked to copy. As a result, memory corruption no longer occurs
in he described scenario. (BZ#1398185)

* Previously, guest virtual machines (VMs) on a Hyper-V server cluster got
in some cases rebooted during the graceful node failover test, because the
host kept sending heartbeat packets independently of guests responding to
them. This update fixes the bug by properly responding to all the heartbeat
messages in the queue, even if they are pending. As a result, guest VMs no
longer get rebooted under the described circumstances. (BZ#1397739)

* When the “punching hole” feature of the fallocate utility was used on an
ext4 file system inode with extent depth of 1, the extent tree of the inode
sometimes became corrupted. With this update, the underlying source code
has been fixed, and extent tree corruption no longer occurs in the
described situation. (BZ#1397808)

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/):

1353533 – CVE-2016-6136 kernel: Race condition vulnerability in execve argv arguments
1397930 – CVE-2016-9555 kernel: Slab out-of-bounds access in sctp_sf_ootb()

6. Package List:

Red Hat Enterprise Linux Desktop (v. 6):

Source:
kernel-2.6.32-642.15.1.el6.src.rpm

i386:
kernel-2.6.32-642.15.1.el6.i686.rpm
kernel-debug-2.6.32-642.15.1.el6.i686.rpm
kernel-debug-debuginfo-2.6.32-642.15.1.el6.i686.rpm
kernel-debug-devel-2.6.32-642.15.1.el6.i686.rpm
kernel-debuginfo-2.6.32-642.15.1.el6.i686.rpm
kernel-debuginfo-common-i686-2.6.32-642.15.1.el6.i686.rpm
kernel-devel-2.6.32-642.15.1.el6.i686.rpm
kernel-headers-2.6.32-642.15.1.el6.i686.rpm
perf-2.6.32-642.15.1.el6.i686.rpm
perf-debuginfo-2.6.32-642.15.1.el6.i686.rpm
python-perf-debuginfo-2.6.32-642.15.1.el6.i686.rpm

noarch:
kernel-abi-whitelists-2.6.32-642.15.1.el6.noarch.rpm
kernel-doc-2.6.32-642.15.1.el6.noarch.rpm
kernel-firmware-2.6.32-642.15.1.el6.noarch.rpm

x86_64:
kernel-2.6.32-642.15.1.el6.x86_64.rpm
kernel-debug-2.6.32-642.15.1.el6.x86_64.rpm
kernel-debug-debuginfo-2.6.32-642.15.1.el6.i686.rpm
kernel-debug-debuginfo-2.6.32-642.15.1.el6.x86_64.rpm
kernel-debug-devel-2.6.32-642.15.1.el6.i686.rpm
kernel-debug-devel-2.6.32-642.15.1.el6.x86_64.rpm
kernel-debuginfo-2.6.32-642.15.1.el6.i686.rpm
kernel-debuginfo-2.6.32-642.15.1.el6.x86_64.rpm
kernel-debuginfo-common-i686-2.6.32-642.15.1.el6.i686.rpm
kernel-debuginfo-common-x86_64-2.6.32-642.15.1.el6.x86_64.rpm
kernel-devel-2.6.32-642.15.1.el6.x86_64.rpm
kernel-headers-2.6.32-642.15.1.el6.x86_64.rpm
perf-2.6.32-642.15.1.el6.x86_64.rpm
perf-debuginfo-2.6.32-642.15.1.el6.i686.rpm
perf-debuginfo-2.6.32-642.15.1.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-642.15.1.el6.i686.rpm
python-perf-debuginfo-2.6.32-642.15.1.el6.x86_64.rpm

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

i386:
kernel-debug-debuginfo-2.6.32-642.15.1.el6.i686.rpm
kernel-debuginfo-2.6.32-642.15.1.el6.i686.rpm
kernel-debuginfo-common-i686-2.6.32-642.15.1.el6.i686.rpm
perf-debuginfo-2.6.32-642.15.1.el6.i686.rpm
python-perf-2.6.32-642.15.1.el6.i686.rpm
python-perf-debuginfo-2.6.32-642.15.1.el6.i686.rpm

x86_64:
kernel-debug-debuginfo-2.6.32-642.15.1.el6.x86_64.rpm
kernel-debuginfo-2.6.32-642.15.1.el6.x86_64.rpm
kernel-debuginfo-common-x86_64-2.6.32-642.15.1.el6.x86_64.rpm
perf-debuginfo-2.6.32-642.15.1.el6.x86_64.rpm
python-perf-2.6.32-642.15.1.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-642.15.1.el6.x86_64.rpm

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

Source:
kernel-2.6.32-642.15.1.el6.src.rpm

noarch:
kernel-abi-whitelists-2.6.32-642.15.1.el6.noarch.rpm
kernel-doc-2.6.32-642.15.1.el6.noarch.rpm
kernel-firmware-2.6.32-642.15.1.el6.noarch.rpm

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

Red Hat Enterprise Linux Server (v. 6):

Source:
kernel-2.6.32-642.15.1.el6.src.rpm

noarch:
kernel-abi-whitelists-2.6.32-642.15.1.el6.noarch.rpm
kernel-doc-2.6.32-642.15.1.el6.noarch.rpm
kernel-firmware-2.6.32-642.15.1.el6.noarch.rpm

ppc64:
kernel-2.6.32-642.15.1.el6.ppc64.rpm
kernel-bootwrapper-2.6.32-642.15.1.el6.ppc64.rpm
kernel-debug-2.6.32-642.15.1.el6.ppc64.rpm
kernel-debug-debuginfo-2.6.32-642.15.1.el6.ppc64.rpm
kernel-debug-devel-2.6.32-642.15.1.el6.ppc64.rpm
kernel-debuginfo-2.6.32-642.15.1.el6.ppc64.rpm
kernel-debuginfo-common-ppc64-2.6.32-642.15.1.el6.ppc64.rpm
kernel-devel-2.6.32-642.15.1.el6.ppc64.rpm
kernel-headers-2.6.32-642.15.1.el6.ppc64.rpm
perf-2.6.32-642.15.1.el6.ppc64.rpm
perf-debuginfo-2.6.32-642.15.1.el6.ppc64.rpm
python-perf-debuginfo-2.6.32-642.15.1.el6.ppc64.rpm

s390x:
kernel-2.6.32-642.15.1.el6.s390x.rpm
kernel-debug-2.6.32-642.15.1.el6.s390x.rpm
kernel-debug-debuginfo-2.6.32-642.15.1.el6.s390x.rpm
kernel-debug-devel-2.6.32-642.15.1.el6.s390x.rpm
kernel-debuginfo-2.6.32-642.15.1.el6.s390x.rpm
kernel-debuginfo-common-s390x-2.6.32-642.15.1.el6.s390x.rpm
kernel-devel-2.6.32-642.15.1.el6.s390x.rpm
kernel-headers-2.6.32-642.15.1.el6.s390x.rpm
kernel-kdump-2.6.32-642.15.1.el6.s390x.rpm
kernel-kdump-debuginfo-2.6.32-642.15.1.el6.s390x.rpm
kernel-kdump-devel-2.6.32-642.15.1.el6.s390x.rpm
perf-2.6.32-642.15.1.el6.s390x.rpm
perf-debuginfo-2.6.32-642.15.1.el6.s390x.rpm
python-perf-debuginfo-2.6.32-642.15.1.el6.s390x.rpm

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

ppc64:
kernel-debug-debuginfo-2.6.32-642.15.1.el6.ppc64.rpm
kernel-debuginfo-2.6.32-642.15.1.el6.ppc64.rpm
kernel-debuginfo-common-ppc64-2.6.32-642.15.1.el6.ppc64.rpm
perf-debuginfo-2.6.32-642.15.1.el6.ppc64.rpm
python-perf-2.6.32-642.15.1.el6.ppc64.rpm
python-perf-debuginfo-2.6.32-642.15.1.el6.ppc64.rpm

s390x:
kernel-debug-debuginfo-2.6.32-642.15.1.el6.s390x.rpm
kernel-debuginfo-2.6.32-642.15.1.el6.s390x.rpm
kernel-debuginfo-common-s390x-2.6.32-642.15.1.el6.s390x.rpm
kernel-kdump-debuginfo-2.6.32-642.15.1.el6.s390x.rpm
perf-debuginfo-2.6.32-642.15.1.el6.s390x.rpm
python-perf-2.6.32-642.15.1.el6.s390x.rpm
python-perf-debuginfo-2.6.32-642.15.1.el6.s390x.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
kernel-2.6.32-642.15.1.el6.src.rpm

noarch:
kernel-abi-whitelists-2.6.32-642.15.1.el6.noarch.rpm
kernel-doc-2.6.32-642.15.1.el6.noarch.rpm
kernel-firmware-2.6.32-642.15.1.el6.noarch.rpm

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

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-2016-6136
https://access.redhat.com/security/cve/CVE-2016-9555
https://access.redhat.com/security/updates/classification/#moderate
https://access.redhat.com/security/vulnerabilities/2706661

8. Contact:

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

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