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Red Hat Security Advisory

Synopsis: Important: kernel security and bug fix update
Advisory ID: RHSA-2018:0169-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2018:0169
Issue date: 2018-01-25
CVE Names: CVE-2017-7542 CVE-2017-9074 CVE-2017-11176
=====================================================================

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 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.

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):

* An integer overflow vulnerability in ip6_find_1stfragopt() function was
found. A local attacker that has privileges (of CAP_NET_RAW) to open raw
socket can cause an infinite loop inside the ip6_find_1stfragopt()
function. (CVE-2017-7542, Moderate)

* The IPv6 fragmentation implementation in the Linux kernel does not
consider that the nexthdr field may be associated with an invalid option,
which allows local users to cause a denial of service (out-of-bounds read
and BUG) or possibly have unspecified other impact via crafted socket and
send system calls. Due to the nature of the flaw, privilege escalation
cannot be fully ruled out, although we believe it is unlikely.
(CVE-2017-9074, Moderate)

* A use-after-free flaw was found in the Netlink functionality of the Linux
kernel networking subsystem. Due to the insufficient cleanup in the
mq_notify function, a local attacker could potentially use this flaw to
escalate their privileges on the system. (CVE-2017-11176, Moderate)

Bug Fix(es):

* Previously, the default timeout and retry settings in the VMBus driver
were insufficient in some cases, for example when a Hyper-V host was under
a significant load. Consequently, in Windows Server 2016, Hyper-V Server
2016, and Windows Azure Platform, when running a Red Hat Enterprise Linux
Guest on the Hyper-V hypervisor, the guest failed to boot or booted with
certain Hyper-V devices missing. This update alters the timeout and retry
settings in VMBus, and Red Hat Enterprise Linux guests now boot as expected
under the described conditions. (BZ#1506145)

* Previously, an incorrect external declaration in the be2iscsi driver
caused a kernel panic when using the systool utility. With this update, the
external declaration in be2iscsi has been fixed, and the kernel no longer
panics when using systool. (BZ#1507512)

* Under high usage of the NFSD file system and memory pressure, if many
tasks in the Linux kernel attempted to obtain the global spinlock to clean
the Duplicate Reply Cache (DRC), these tasks stayed in an active wait in
the nfsd_reply_cache_shrink() function for up to 99% of time. Consequently,
a high load average occurred. This update fixes the bug by separating the
DRC in several parts, each with an independent spinlock. As a result, the
load and CPU utilization is no longer excessive under the described
circumstances. (BZ#1509876)

* When attempting to attach multiple SCSI devices simultaneously, Red Hat
Enterprise Linux 6.9 on IBM z Systems sometimes became unresponsive. This
update fixes the zfcp device driver, and attaching multiple SCSI devices
simultaneously now works as expected in the described scenario.
(BZ#1512425)

* On IBM z Systems, the tiqdio_call_inq_handlers() function in the Linux
kernel incorrectly cleared the device state change indicator (DSCI) for the
af_iucv devices using the HiperSockets transport with multiple input
queues. Consequently, queue stalls on such devices occasionally occurred.
With this update, tiqdio_call_inq_handlers() has been fixed to clear the
DSCI only once, prior to scanning the queues. As a result, queue stalls for
af_iucv devices using the HiperSockets transport no longer occur under the
described circumstances. (BZ#1513314)

* Previously, small data chunks caused the Stream Control Transmission
Protocol (SCTP) to account the receiver_window (rwnd) values incorrectly
when recovering from a “zero-window situation”. As a consequence, window
updates were not sent to the peer, and an artificial growth of rwnd could
lead to packet drops. This update properly accounts such small data chunks
and ignores the rwnd pressure values when reopening a window. As a result,
window updates are now sent, and the announced rwnd reflects better the
real state of the receive buffer. (BZ#1514443)

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

The system must be rebooted for this update to take effect.

5. Bugs fixed (https://bugzilla.redhat.com/):

1452679 – CVE-2017-9074 kernel: net: IPv6 fragmentation implementation of nexthdr field may be associated with an invalid option
1470659 – CVE-2017-11176 kernel: Use-after-free in sys_mq_notify()
1473649 – CVE-2017-7542 kernel: Integer overflow in ip6_find_1stfragopt() causes infinite loop

6. Package List:

Red Hat Enterprise Linux Desktop (v. 6):

Source:
kernel-2.6.32-696.20.1.el6.src.rpm

i386:
kernel-2.6.32-696.20.1.el6.i686.rpm
kernel-debug-2.6.32-696.20.1.el6.i686.rpm
kernel-debug-debuginfo-2.6.32-696.20.1.el6.i686.rpm
kernel-debug-devel-2.6.32-696.20.1.el6.i686.rpm
kernel-debuginfo-2.6.32-696.20.1.el6.i686.rpm
kernel-debuginfo-common-i686-2.6.32-696.20.1.el6.i686.rpm
kernel-devel-2.6.32-696.20.1.el6.i686.rpm
kernel-headers-2.6.32-696.20.1.el6.i686.rpm
perf-2.6.32-696.20.1.el6.i686.rpm
perf-debuginfo-2.6.32-696.20.1.el6.i686.rpm
python-perf-debuginfo-2.6.32-696.20.1.el6.i686.rpm

noarch:
kernel-abi-whitelists-2.6.32-696.20.1.el6.noarch.rpm
kernel-doc-2.6.32-696.20.1.el6.noarch.rpm
kernel-firmware-2.6.32-696.20.1.el6.noarch.rpm

x86_64:
kernel-2.6.32-696.20.1.el6.x86_64.rpm
kernel-debug-2.6.32-696.20.1.el6.x86_64.rpm
kernel-debug-debuginfo-2.6.32-696.20.1.el6.i686.rpm
kernel-debug-debuginfo-2.6.32-696.20.1.el6.x86_64.rpm
kernel-debug-devel-2.6.32-696.20.1.el6.i686.rpm
kernel-debug-devel-2.6.32-696.20.1.el6.x86_64.rpm
kernel-debuginfo-2.6.32-696.20.1.el6.i686.rpm
kernel-debuginfo-2.6.32-696.20.1.el6.x86_64.rpm
kernel-debuginfo-common-i686-2.6.32-696.20.1.el6.i686.rpm
kernel-debuginfo-common-x86_64-2.6.32-696.20.1.el6.x86_64.rpm
kernel-devel-2.6.32-696.20.1.el6.x86_64.rpm
kernel-headers-2.6.32-696.20.1.el6.x86_64.rpm
perf-2.6.32-696.20.1.el6.x86_64.rpm
perf-debuginfo-2.6.32-696.20.1.el6.i686.rpm
perf-debuginfo-2.6.32-696.20.1.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-696.20.1.el6.i686.rpm
python-perf-debuginfo-2.6.32-696.20.1.el6.x86_64.rpm

Red Hat Enterprise Linux Desktop Optional (v. 6):

i386:
kernel-debug-debuginfo-2.6.32-696.20.1.el6.i686.rpm
kernel-debuginfo-2.6.32-696.20.1.el6.i686.rpm
kernel-debuginfo-common-i686-2.6.32-696.20.1.el6.i686.rpm
perf-debuginfo-2.6.32-696.20.1.el6.i686.rpm
python-perf-2.6.32-696.20.1.el6.i686.rpm
python-perf-debuginfo-2.6.32-696.20.1.el6.i686.rpm

x86_64:
kernel-debug-debuginfo-2.6.32-696.20.1.el6.x86_64.rpm
kernel-debuginfo-2.6.32-696.20.1.el6.x86_64.rpm
kernel-debuginfo-common-x86_64-2.6.32-696.20.1.el6.x86_64.rpm
perf-debuginfo-2.6.32-696.20.1.el6.x86_64.rpm
python-perf-2.6.32-696.20.1.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-696.20.1.el6.x86_64.rpm

Red Hat Enterprise Linux HPC Node (v. 6):

Source:
kernel-2.6.32-696.20.1.el6.src.rpm

noarch:
kernel-abi-whitelists-2.6.32-696.20.1.el6.noarch.rpm
kernel-doc-2.6.32-696.20.1.el6.noarch.rpm
kernel-firmware-2.6.32-696.20.1.el6.noarch.rpm

Red Hat Enterprise Linux HPC Node Optional (v. 6):

Red Hat Enterprise Linux Server (v. 6):

Source:
kernel-2.6.32-696.20.1.el6.src.rpm

noarch:
kernel-abi-whitelists-2.6.32-696.20.1.el6.noarch.rpm
kernel-doc-2.6.32-696.20.1.el6.noarch.rpm
kernel-firmware-2.6.32-696.20.1.el6.noarch.rpm

ppc64:
kernel-2.6.32-696.20.1.el6.ppc64.rpm
kernel-bootwrapper-2.6.32-696.20.1.el6.ppc64.rpm
kernel-debug-2.6.32-696.20.1.el6.ppc64.rpm
kernel-debug-debuginfo-2.6.32-696.20.1.el6.ppc64.rpm
kernel-debug-devel-2.6.32-696.20.1.el6.ppc64.rpm
kernel-debuginfo-2.6.32-696.20.1.el6.ppc64.rpm
kernel-debuginfo-common-ppc64-2.6.32-696.20.1.el6.ppc64.rpm
kernel-devel-2.6.32-696.20.1.el6.ppc64.rpm
kernel-headers-2.6.32-696.20.1.el6.ppc64.rpm
perf-2.6.32-696.20.1.el6.ppc64.rpm
perf-debuginfo-2.6.32-696.20.1.el6.ppc64.rpm
python-perf-debuginfo-2.6.32-696.20.1.el6.ppc64.rpm

s390x:
kernel-2.6.32-696.20.1.el6.s390x.rpm
kernel-debug-2.6.32-696.20.1.el6.s390x.rpm
kernel-debug-debuginfo-2.6.32-696.20.1.el6.s390x.rpm
kernel-debug-devel-2.6.32-696.20.1.el6.s390x.rpm
kernel-debuginfo-2.6.32-696.20.1.el6.s390x.rpm
kernel-debuginfo-common-s390x-2.6.32-696.20.1.el6.s390x.rpm
kernel-devel-2.6.32-696.20.1.el6.s390x.rpm
kernel-headers-2.6.32-696.20.1.el6.s390x.rpm
kernel-kdump-2.6.32-696.20.1.el6.s390x.rpm
kernel-kdump-debuginfo-2.6.32-696.20.1.el6.s390x.rpm
kernel-kdump-devel-2.6.32-696.20.1.el6.s390x.rpm
perf-2.6.32-696.20.1.el6.s390x.rpm
perf-debuginfo-2.6.32-696.20.1.el6.s390x.rpm
python-perf-debuginfo-2.6.32-696.20.1.el6.s390x.rpm

Red Hat Enterprise Linux Server Optional (v. 6):

ppc64:
kernel-debug-debuginfo-2.6.32-696.20.1.el6.ppc64.rpm
kernel-debuginfo-2.6.32-696.20.1.el6.ppc64.rpm
kernel-debuginfo-common-ppc64-2.6.32-696.20.1.el6.ppc64.rpm
perf-debuginfo-2.6.32-696.20.1.el6.ppc64.rpm
python-perf-2.6.32-696.20.1.el6.ppc64.rpm
python-perf-debuginfo-2.6.32-696.20.1.el6.ppc64.rpm

s390x:
kernel-debug-debuginfo-2.6.32-696.20.1.el6.s390x.rpm
kernel-debuginfo-2.6.32-696.20.1.el6.s390x.rpm
kernel-debuginfo-common-s390x-2.6.32-696.20.1.el6.s390x.rpm
kernel-kdump-debuginfo-2.6.32-696.20.1.el6.s390x.rpm
perf-debuginfo-2.6.32-696.20.1.el6.s390x.rpm
python-perf-2.6.32-696.20.1.el6.s390x.rpm
python-perf-debuginfo-2.6.32-696.20.1.el6.s390x.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
kernel-2.6.32-696.20.1.el6.src.rpm

noarch:
kernel-abi-whitelists-2.6.32-696.20.1.el6.noarch.rpm
kernel-doc-2.6.32-696.20.1.el6.noarch.rpm
kernel-firmware-2.6.32-696.20.1.el6.noarch.rpm

Red Hat Enterprise Linux Workstation Optional (v. 6):

These packages are GPG signed by Red Hat for security. Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/

7. References:

https://access.redhat.com/security/cve/CVE-2017-7542
https://access.redhat.com/security/cve/CVE-2017-9074
https://access.redhat.com/security/cve/CVE-2017-11176
https://access.redhat.com/security/updates/classification/#important

8. Contact:

The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

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