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====================================================================                   
Red Hat Security Advisory

Synopsis:          Important: kernel security and bug fix update
Advisory ID:       RHSA-2018:2790-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2018:2790
Issue date:        2018-09-25
CVE Names:         CVE-2018-5390
====================================================================
1. Summary:

An update for kernel is now available for Red Hat Enterprise Linux 7.2
Advanced Update Support, Red Hat Enterprise Linux 7.2 Telco Extended Update
Support, and Red Hat Enterprise Linux 7.2 Update Services for SAP
Solutions.

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 Server AUS (v. 7.2) - noarch, x86_64
Red Hat Enterprise Linux Server E4S (v. 7.2) - noarch, ppc64le, x86_64
Red Hat Enterprise Linux Server Optional AUS (v. 7.2) - x86_64
Red Hat Enterprise Linux Server Optional E4S (v. 7.2) - ppc64le, x86_64
Red Hat Enterprise Linux Server Optional TUS (v. 7.2) - x86_64
Red Hat Enterprise Linux Server TUS (v. 7.2) - noarch, x86_64

3. Description:

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

Security Fix(es):

* A flaw named SegmentSmack was found in the way the Linux kernel handled
specially crafted TCP packets. A remote attacker could use this flaw to
trigger time and calculation expensive calls to tcp_collapse_ofo_queue()
and tcp_prune_ofo_queue() functions by sending specially modified packets
within ongoing TCP sessions which could lead to a CPU saturation and hence
a denial of service on the system. Maintaining the denial of service
condition requires continuous two-way TCP sessions to a reachable open
port, thus the attacks cannot be performed using spoofed IP addresses.
(CVE-2018-5390)

Red Hat would like to thank Juha-Matti Tilli (Aalto University - Department
of Communications and Networking and Nokia Bell Labs) for reporting this
issue.

Bug Fix(es):

* Previously, the early microcode updater in the kernel was trying to
perform a microcode update on virtualized guests. As a consequence, the
virtualized guests sometimes mishandled the request to perform the
microcode update and became unresponsive in the early boot stage. This
update applies an upstream patch to avoid the early microcode update when
running under a hypervisor. As a result, no kernel freezes appear in the
described scenario. (BZ#1618386)

4. Solution:

For details on how to apply this update, refer to:

https://access.redhat.com/articles/11258

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

1601704 - CVE-2018-5390 kernel: TCP segments with random offsets allow a remote denial of service (SegmentSmack)

6. Package List:

Red Hat Enterprise Linux Server AUS (v. 7.2):

Source:
kernel-3.10.0-327.73.1.el7.src.rpm

noarch:
kernel-abi-whitelists-3.10.0-327.73.1.el7.noarch.rpm
kernel-doc-3.10.0-327.73.1.el7.noarch.rpm

x86_64:
kernel-3.10.0-327.73.1.el7.x86_64.rpm
kernel-debug-3.10.0-327.73.1.el7.x86_64.rpm
kernel-debug-debuginfo-3.10.0-327.73.1.el7.x86_64.rpm
kernel-debug-devel-3.10.0-327.73.1.el7.x86_64.rpm
kernel-debuginfo-3.10.0-327.73.1.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-327.73.1.el7.x86_64.rpm
kernel-devel-3.10.0-327.73.1.el7.x86_64.rpm
kernel-headers-3.10.0-327.73.1.el7.x86_64.rpm
kernel-tools-3.10.0-327.73.1.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-327.73.1.el7.x86_64.rpm
kernel-tools-libs-3.10.0-327.73.1.el7.x86_64.rpm
perf-3.10.0-327.73.1.el7.x86_64.rpm
perf-debuginfo-3.10.0-327.73.1.el7.x86_64.rpm
python-perf-3.10.0-327.73.1.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-327.73.1.el7.x86_64.rpm

Red Hat Enterprise Linux Server E4S (v. 7.2):

Source:
kernel-3.10.0-327.73.1.el7.src.rpm

noarch:
kernel-abi-whitelists-3.10.0-327.73.1.el7.noarch.rpm
kernel-doc-3.10.0-327.73.1.el7.noarch.rpm

ppc64le:
kernel-3.10.0-327.73.1.el7.ppc64le.rpm
kernel-bootwrapper-3.10.0-327.73.1.el7.ppc64le.rpm
kernel-debug-3.10.0-327.73.1.el7.ppc64le.rpm
kernel-debug-debuginfo-3.10.0-327.73.1.el7.ppc64le.rpm
kernel-debuginfo-3.10.0-327.73.1.el7.ppc64le.rpm
kernel-debuginfo-common-ppc64le-3.10.0-327.73.1.el7.ppc64le.rpm
kernel-devel-3.10.0-327.73.1.el7.ppc64le.rpm
kernel-headers-3.10.0-327.73.1.el7.ppc64le.rpm
kernel-tools-3.10.0-327.73.1.el7.ppc64le.rpm
kernel-tools-debuginfo-3.10.0-327.73.1.el7.ppc64le.rpm
kernel-tools-libs-3.10.0-327.73.1.el7.ppc64le.rpm
perf-3.10.0-327.73.1.el7.ppc64le.rpm
perf-debuginfo-3.10.0-327.73.1.el7.ppc64le.rpm
python-perf-3.10.0-327.73.1.el7.ppc64le.rpm
python-perf-debuginfo-3.10.0-327.73.1.el7.ppc64le.rpm

x86_64:
kernel-3.10.0-327.73.1.el7.x86_64.rpm
kernel-debug-3.10.0-327.73.1.el7.x86_64.rpm
kernel-debug-debuginfo-3.10.0-327.73.1.el7.x86_64.rpm
kernel-debug-devel-3.10.0-327.73.1.el7.x86_64.rpm
kernel-debuginfo-3.10.0-327.73.1.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-327.73.1.el7.x86_64.rpm
kernel-devel-3.10.0-327.73.1.el7.x86_64.rpm
kernel-headers-3.10.0-327.73.1.el7.x86_64.rpm
kernel-tools-3.10.0-327.73.1.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-327.73.1.el7.x86_64.rpm
kernel-tools-libs-3.10.0-327.73.1.el7.x86_64.rpm
perf-3.10.0-327.73.1.el7.x86_64.rpm
perf-debuginfo-3.10.0-327.73.1.el7.x86_64.rpm
python-perf-3.10.0-327.73.1.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-327.73.1.el7.x86_64.rpm

Red Hat Enterprise Linux Server TUS (v. 7.2):

Source:
kernel-3.10.0-327.73.1.el7.src.rpm

noarch:
kernel-abi-whitelists-3.10.0-327.73.1.el7.noarch.rpm
kernel-doc-3.10.0-327.73.1.el7.noarch.rpm

x86_64:
kernel-3.10.0-327.73.1.el7.x86_64.rpm
kernel-debug-3.10.0-327.73.1.el7.x86_64.rpm
kernel-debug-debuginfo-3.10.0-327.73.1.el7.x86_64.rpm
kernel-debug-devel-3.10.0-327.73.1.el7.x86_64.rpm
kernel-debuginfo-3.10.0-327.73.1.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-327.73.1.el7.x86_64.rpm
kernel-devel-3.10.0-327.73.1.el7.x86_64.rpm
kernel-headers-3.10.0-327.73.1.el7.x86_64.rpm
kernel-tools-3.10.0-327.73.1.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-327.73.1.el7.x86_64.rpm
kernel-tools-libs-3.10.0-327.73.1.el7.x86_64.rpm
perf-3.10.0-327.73.1.el7.x86_64.rpm
perf-debuginfo-3.10.0-327.73.1.el7.x86_64.rpm
python-perf-3.10.0-327.73.1.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-327.73.1.el7.x86_64.rpm

Red Hat Enterprise Linux Server Optional AUS (v. 7.2):

x86_64:
kernel-debug-debuginfo-3.10.0-327.73.1.el7.x86_64.rpm
kernel-debuginfo-3.10.0-327.73.1.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-327.73.1.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-327.73.1.el7.x86_64.rpm
kernel-tools-libs-devel-3.10.0-327.73.1.el7.x86_64.rpm
perf-debuginfo-3.10.0-327.73.1.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-327.73.1.el7.x86_64.rpm

Red Hat Enterprise Linux Server Optional E4S (v. 7.2):

ppc64le:
kernel-debug-debuginfo-3.10.0-327.73.1.el7.ppc64le.rpm
kernel-debug-devel-3.10.0-327.73.1.el7.ppc64le.rpm
kernel-debuginfo-3.10.0-327.73.1.el7.ppc64le.rpm
kernel-debuginfo-common-ppc64le-3.10.0-327.73.1.el7.ppc64le.rpm
kernel-tools-debuginfo-3.10.0-327.73.1.el7.ppc64le.rpm
kernel-tools-libs-devel-3.10.0-327.73.1.el7.ppc64le.rpm
perf-debuginfo-3.10.0-327.73.1.el7.ppc64le.rpm
python-perf-debuginfo-3.10.0-327.73.1.el7.ppc64le.rpm

x86_64:
kernel-debug-debuginfo-3.10.0-327.73.1.el7.x86_64.rpm
kernel-debuginfo-3.10.0-327.73.1.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-327.73.1.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-327.73.1.el7.x86_64.rpm
kernel-tools-libs-devel-3.10.0-327.73.1.el7.x86_64.rpm
perf-debuginfo-3.10.0-327.73.1.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-327.73.1.el7.x86_64.rpm

Red Hat Enterprise Linux Server Optional TUS (v. 7.2):

x86_64:
kernel-debug-debuginfo-3.10.0-327.73.1.el7.x86_64.rpm
kernel-debuginfo-3.10.0-327.73.1.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-327.73.1.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-327.73.1.el7.x86_64.rpm
kernel-tools-libs-devel-3.10.0-327.73.1.el7.x86_64.rpm
perf-debuginfo-3.10.0-327.73.1.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-327.73.1.el7.x86_64.rpm

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-2018-5390
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/

Copyright 2018 Red Hat, Inc.
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