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Security Advisory - Moderate: kernel security, bug fix, update - RH EL6

Offline TerryF

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Red Hat has released a security update for EL6 that will apply to
Koozali SME9.#, it has been rated as Moderate.

Update will be available from upstream as appropriate.

See here for full notice: https://rhn.redhat.com/errata/RHSA-2016-0855.html

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                   Red Hat Security Advisory

Synopsis:          Moderate: kernel security, bug fix, and enhancement update
Advisory ID:       RHSA-2016:0855-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2016-0855.html
Issue date:        2016-05-10
CVE Names:         CVE-2010-5313 CVE-2013-4312 CVE-2014-7842
                   CVE-2014-8134 CVE-2015-5156 CVE-2015-7509
                   CVE-2015-8215 CVE-2015-8324 CVE-2015-8543
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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):

* It was found that reporting emulation failures to user space could lead
to either a local (CVE-2014-7842) or a L2->L1 (CVE-2010-5313) denial of
service. In the case of a local denial of service, an attacker must have
access to the MMIO area or be able to access an I/O port. Please note that
on certain systems, HPET is mapped to userspace as part of vdso (vvar) and
thus an unprivileged user may generate MMIO transactions (and enter the
emulator) this way. (CVE-2010-5313, CVE-2014-7842, Moderate)

* It was found that the Linux kernel did not properly account file
descriptors passed over the unix socket against the process limit. A local
user could use this flaw to exhaust all available memory on the system.
(CVE-2013-4312, Moderate)

* A buffer overflow flaw was found in the way the Linux kernel's virtio-net
subsystem handled certain fraglists when the GRO (Generic Receive Offload)
functionality was enabled in a bridged network configuration. An attacker
on the local network could potentially use this flaw to crash the system,
or, although unlikely, elevate their privileges on the system.
(CVE-2015-5156, Moderate)

* It was found that the Linux kernel's IPv6 network stack did not properly
validate the value of the MTU variable when it was set. A remote attacker
could potentially use this flaw to disrupt a target system's networking
(packet loss) by setting an invalid MTU value, for example, via a
NetworkManager daemon that is processing router advertisement packets
running on the target system. (CVE-2015-8215, Moderate)

* A NULL pointer dereference flaw was found in the way the Linux kernel's
network subsystem handled socket creation with an invalid protocol
identifier. A local user could use this flaw to crash the system.
(CVE-2015-8543, Moderate)

* It was found that the espfix functionality does not work for 32-bit KVM
paravirtualized guests. A local, unprivileged guest user could potentially
use this flaw to leak kernel stack addresses. (CVE-2014-8134, Low)

* A flaw was found in the way the Linux kernel's ext4 file system driver
handled non-journal file systems with an orphan list. An attacker with
physical access to the system could use this flaw to crash the system or,
although unlikely, escalate their privileges on the system. (CVE-2015-7509,
Low)

* A NULL pointer dereference flaw was found in the way the Linux kernel's
ext4 file system driver handled certain corrupted file system images. An
attacker with physical access to the system could use this flaw to crash
the system. (CVE-2015-8324, Low)

Red Hat would like to thank Nadav Amit for reporting CVE-2010-5313 and
CVE-2014-7842, Andy Lutomirski for reporting CVE-2014-8134, and Dmitriy
Monakhov (OpenVZ) for reporting CVE-2015-8324. The CVE-2015-5156 issue was
discovered by Jason Wang (Red Hat).

Additional Changes:

* Refer to Red Hat Enterprise Linux 6.8 Release Notes for information on
new kernel features and known issues, and Red Hat Enterprise Linux
Technical Notes for information on device driver updates, important changes
to external kernel parameters, notable bug fixes, and technology previews.
Both of these documents are linked to in the References section.

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
--
qui scribit bis legit