Scientific Linux Security Update : kernel on SL6.x i386/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 :

Security Fix(es) :

- A use-after-free vulnerability was found in the kernels
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)

- An out-of-bounds heap memory access leading to a Denial
of Service, heap disclosure, or further impact was found
in setsockopt(). The function call is normally
restricted to root, however some processes with
cap_sys_admin may also be able to trigger this flaw in
privileged container environments. (CVE-2016-4998,

- 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)

Bug Fix(es) :

- When parallel NFS returned a file layout, a kernel crash
sometimes occurred. This update removes the call to the
BUG_ON() function from a code path of a client that
returns the file layout. As a result, the kernel no
longer crashes in the described situation.

- When a guest virtual machine (VM) on Microsoft Hyper-V
was set to crash on a Nonmaskable Interrupt (NMI) that
was injected from the host, this VM became unresponsive
and did not create the vmcore dump file. This update
applies a set of patches to the Virtual Machine Bus
kernel driver (hv_vmbus) that fix this bug. As a result,
the VM now first creates and saves the vmcore dump file
and then reboots.

- From Scientific Linux 6.6 to 6.8, the IPv6 routing cache
occasionally showed incorrect values. This update fixes
the DST_NOCOUNT mechanism, and the IPv6 routing cache
now shows correct values.

- When using the ixgbe driver and the software Fibre
Channel over Ethernet (FCoE) stack, suboptimal
performance in some cases occurred on systems with a
large number of CPUs. This update fixes the
fc_exch_alloc() function to try all the available
exchange managers in the list for an available exchange
ID. This change avoids failing allocations, which
previously led to the host busy status.

- When the vmwgfx kernel module loads, it overrides the
boot resolution automatically. Consequently, users were
not able to change the resolution by manual setting of
the kernel's 'vga=' parameter in the
/boot/grub/grub.conf file. This update adds the
'nomodeset' parameter, which can be set in the
/boot/grub/grub.conf file. The 'nomodeset' parameter
allows the users to prevent the vmwgfx driver from
loading. As a result, the setting of the 'vga='
parameter works as expected, in case that vmwgfx does
not load.

- When Scientific Linux 6.8 was booted on SMBIOS 3.0 based
systems, Desktop Management Interface (DMI) information,
which is referenced by several applications, such as NEC
server's memory RAS utility, was missing entries in the
sysfs virtual file system. This update fixes the
underlying source code, and sysfs now shows the DMI
information as expected.

- Previously, bonding mode active backup and the
propagation of the media access control (MAC) address to
a VLAN interface did not work in Scientific Linux 6.8,
when the fail_over_mac bonding parameter was set to
fail_over_mac=active. With this update, the underlying
source code has been fixed so that the VLANs continue
inheriting the MAC address of the active physical
interface until the VLAN MAC address is explicitly set
to any value. As a result, IPv6 EUI64 addresses for the
VLAN can reflect any changes to the MAC address of the
physical interface, and Duplicate Address Detection
(DAD) behaves as expected.

See also :

Solution :

Update the affected packages.

Risk factor :

Critical / CVSS Base Score : 10.0

Family: Scientific Linux Local Security Checks

Nessus Plugin ID: 96481 ()

Bugtraq ID:

CVE ID: CVE-2016-4998

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