RHEL 6 : kernel (RHSA-2016:0715)

This script is Copyright (C) 2016-2017 Tenable Network Security, Inc.


Synopsis :

The remote Red Hat host is missing one or more security updates.

Description :

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.

The kernel packages contain the Linux kernel, the core of any Linux
operating system.

Security Fix(es) :

* A flaw was found in the way the Linux kernel handled IRET faults
during the processing of NMIs. An unprivileged, local user could use
this flaw to crash the system or, potentially (although highly
unlikely), escalate their privileges on the system. (CVE-2015-5157,
Moderate)

* A race condition flaw was found in the way the Linux kernel's SCTP
implementation handled sctp_accept() during the processing of
heartbeat timeout events. A remote attacker could use this flaw to
prevent further connections to be accepted by the SCTP server running
on the system, resulting in a denial of service. (CVE-2015-8767,
Moderate)

Bug Fix(es) :

* When the nvme driver held the queue lock for too long, for example
during DMA mapping, a lockup occurred leading to nvme hard-lockup
panic. This update fixes the underlying source code, and nvme now
works as expected.(BZ#1314209)

* Due to a regression, a Unix domain datagram socket could come to a
deadlock when sending a datagram to itself. The provided patch adds
another 'sk' check to the unix_dgram_sendmsg() function, and the
aforementioned deadlock no longer occurs. (BZ#1315696)

* Previously, writing a large file using direct I/O in 16 MB chunks
sometimes caused a pathological allocation pattern where 16 MB chunks
of large free extent were allocated to a file in reversed order. The
provided patch avoids the backward allocation, and writing a large
file using direct I/O now proceeds successfully. (BZ#1320031)

* MD RAID1 devices that repeatedly became hot removed and re-added
could become mismatched due to a race condition. This caused them to
return stale data, leading to data corruption. The provided set of
patches fixes this bug, and hot removals and re-additions of md
devices now work as expected. (BZ#1320863)

* A couple of previous fixes caused a deadlock on the 'rq' lock
leading to a kernel panic on CPU 0. The provided set of patches
reverts the relevant commits, thus preventing the panic from
occurring. (BZ#1326043)

Enhancement(s) :

* VLAN support has been updated to integrate some of the latest
upstream features. This update also makes sure that NULL pointer
crashes related to VLAN support in bonding mode no longer occur and
that tag stripping and insertion work as expected. (BZ#1315706)

* This update adds additional model numbers for Broadwell to perf.
(BZ#1320035)

See also :

https://www.redhat.com/security/data/cve/CVE-2015-5157.html
https://www.redhat.com/security/data/cve/CVE-2015-8767.html
http://rhn.redhat.com/errata/RHSA-2016-0715.html

Solution :

Update the affected packages.

Risk factor :

High / CVSS Base Score : 7.2
(CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C)
CVSS Temporal Score : 5.3
(CVSS2#E:U/RL:OF/RC:C)
Public Exploit Available : false

Family: Red Hat Local Security Checks

Nessus Plugin ID: 90881 ()

Bugtraq ID:

CVE ID: CVE-2015-5157
CVE-2015-8767

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