RHEL 7 : kernel (RHSA-2016:1277)

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 7.

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.

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

These updated kernel packages include several security issues and
numerous bug fixes, some of which you can see below. Space precludes
documenting all of these bug fixes in this advisory. To see the
complete list of bug fixes, users are directed to the related
Knowledge Article: https://access.redhat.com/articles/2361921.

Security Fixes :

* A flaw was found in the way certain interfaces of the Linux kernel's
Infiniband subsystem used write() as bi-directional ioctl()
replacement, which could lead to insufficient memory security checks
when being invoked using the splice() system call. A local
unprivileged user on a system with either Infiniband hardware present
or RDMA Userspace Connection Manager Access module explicitly loaded,
could use this flaw to escalate their privileges on the system.
(CVE-2016-4565, Important)

* 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,

Red Hat would like to thank Jann Horn for reporting CVE-2016-4565.

Bug Fixes :

* When Small Computer System Interface (SCSI) devices were removed or
deleted, a system crash could occur due to a race condition between
listing all SCSI devices and SCSI device removal. The provided patch
ensures that the starting node for the klist_iter_init_node() function
is actually a member of the list before using it. As a result, a
system crash no longer occurs in the described scenario. (BZ#1333403)

* This update offers a reworked series of patches for the resizable
hash table (rhashtable) including a number of backported bug fixes and
enhancements from upstream. (BZ#1328801)

* Previously, the same value of the mperf Model-Specific Register
(MSR) read twice in a row could lead to a kernel panic due to the
divide-by-zero error. The provided patch fixes this bug, and the
kernel now handles two identical values of mperf gracefully.

* When a transparent proxy application was running and the number of
established connections on the computer exceeded one million,
unrelated processes, such as curl or ssh, were unable to bind to a
local IP on the box to initiate a connection. The provided patch fixes
the cooperation of the REUSEADDR/NOREUSEADDR socket option, and thus
prevents the local port from being exhausted. As a result, the
aforementioned bug no longer occurs in the described scenario.

* Previously, the kernel support for non-local bind for the IPv6
protocol was incomplete. As a consequence, an attempt to bind a socket
to an IPv6 address that is not assigned to the host could fail. The
provided patch includes changes in the ip_nonlocal_bind variable,
which is now set to allow binding to an IPv6 address that is not
assigned to the host. As a result, Linux servers are now able to bind
to non-local IPv6 addresses as expected. (BZ#1324502)

* On some servers with a faster CPU, USB initialization could
previously lead to a kernel hang during boot. If this inconvenience
occurred when booting the second kernel during the kdump operation,
the kdump service failed and the vmcore was lost. The provided
upstream patch fixes this bug, and the kernel no longer hangs after
USB initialization. (BZ#1327581)

* Previously, when running iperf servers using the mlx4_en module, a
kernel panic occurred. The underlying source code has been fixed, and
the kernel panic no longer occurs in the described scenario.

See also :


Solution :

Update the affected packages.

Risk factor :

High / CVSS Base Score : 7.2
CVSS Temporal Score : 5.3
Public Exploit Available : false

Family: Red Hat Local Security Checks

Nessus Plugin ID: 91801 ()

Bugtraq ID:

CVE ID: CVE-2015-8767

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