Scientific Linux Security Update : kernel on SL7.x x86_64

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

Synopsis :

The remote Scientific Linux host is missing one or more security

Description :

To see the complete list of bug fixes, users are directed to the
related Knowledge Article :

Security Fix(es) :

- A use-after-free vulnerability was found in the kernel's
socket recvmmsg subsystem. This may allow remote
attackers to corrupt memory and may allow execution of
arbitrary code. This corruption takes place during the
error handling routines within __sys_recvmmsg()
function. (CVE-2016-7117, Important)

- A use-after-free vulnerability was found in
tcp_xmit_retransmit_queue and other tcp_* functions.
This condition could allow an attacker to send an
incorrect selective acknowledgment to existing
connections, possibly resetting a connection.
(CVE-2016-6828, 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,

Bug Fix(es) :

- Previously, the performance of Internet Protocol over
InfiniBand (IPoIB) was suboptimal due to a conflict of
IPoIB with the Generic Receive Offload (GRO)
infrastructure. With this update, the data cached by the
IPoIB driver has been moved from a control block into
the IPoIB hard header, thus avoiding the GRO problem and
the corruption of IPoIB address information. As a
result, the performance of IPoIB has been improved.

- Previously, when a virtual machine (VM) with
PCI-Passthrough interfaces was recreated, a race
condition between the eventfd daemon and the virqfd
daemon occurred. Consequently, the operating system
rebooted. This update fixes the race condition. As a
result, the operating system no longer reboots in the
described situation.

- Previously, a packet loss occurred when the team driver
in round-robin mode was sending a large number of
packets. This update fixes counting of the packets in
the round-robin runner of the team driver, and the
packet loss no longer occurs in the described situation.

- Previously, the virtual network devices contained in the
deleted namespace could be deleted in any order. If the
loopback device was not deleted as the last item, other
netns devices, such as vxlan devices, could end up with
dangling references to the loopback device.
Consequently, deleting a network namespace (netns)
occasionally ended by a kernel oops. With this update,
the underlying source code has been fixed to ensure the
correct order when deleting the virtual network devices
on netns deletion. As a result, the kernel oops no
longer occurs under the described circumstances.

- Previously, a Kabylake system with a Sunrise Point
Platform Controller Hub (PCH) with a PCI device ID of
0xA149 showed the following warning messages during the
boot :

'Unknown Intel PCH (0xa149) detected.' 'Warning: Intel Kabylake
processor with unknown PCH - this hardware has not undergone testing

The messages were shown because this PCH was not properly recognized.
With this update, the problem has been fixed, and the operating system
now boots without displaying the warning messages.

- Previously, the operating system occasionally became
unresponsive after a long run. This was caused by a race
condition between the try_to_wake_up() function and a
woken up task in the core scheduler. With this update,
the race condition has been fixed, and the operating
system no longer locks up in the described scenario.

See also :

Solution :

Update the affected packages.

Risk factor :

Critical / CVSS Base Score : 10.0

Family: Scientific Linux Local Security Checks

Nessus Plugin ID: 96599 ()

Bugtraq ID:

CVE ID: CVE-2016-6828

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