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Red Hat Security Advisory

Synopsis:          Important: kernel security and bug fix update
Advisory ID:       RHSA-2018:2791-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2018:2791
Issue date:        2018-09-25
CVE Names:         CVE-2018-5390 CVE-2018-5391 CVE-2018-10675
====================================================================
1. Summary:

An update for kernel is now available for Red Hat Enterprise Linux 6.4
Advanced Update Support.

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. 6.4) - noarch, x86_64
Red Hat Enterprise Linux Server Optional AUS (v. 6.4) - 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)

* A flaw named FragmentSmack was found in the way the Linux kernel handled
reassembly of fragmented IPv4 and IPv6 packets. A remote attacker could use
this flaw to trigger time and calculation expensive fragment reassembly
algorithm by sending specially crafted packets which could lead to a CPU
saturation and hence a denial of service on the system. (CVE-2018-5391)

* kernel: mm: use-after-free in do_get_mempolicy function allows local DoS
or other unspecified impact (CVE-2018-10675)

For more details about the security issue(s), including the impact, a CVSS
score, and other related information, refer to the CVE page(s) listed in
the References section.

Red Hat would like to thank Juha-Matti Tilli (Aalto University - Department
of Communications and Networking and Nokia Bell Labs) for reporting
CVE-2018-5390 and CVE-2018-5391.

Bug Fix(es):

* After updating the system to prevent the L1 Terminal Fault (L1TF)
vulnerability, only one thread was detected on systems that offer
processing of two threads on a single processor core. With this update, the
"__max_smt_threads()" function has been fixed. As a result, both threads
are now detected correctly in the described situation. (BZ#1625330)

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/):

1575065 - CVE-2018-10675 kernel: mm: use-after-free in do_get_mempolicy function allows local DoS or other unspecified impact
1601704 - CVE-2018-5390 kernel: TCP segments with random offsets allow a remote denial of service (SegmentSmack)
1609664 - CVE-2018-5391 kernel: IP fragments with random offsets allow a remote denial of service (FragmentSmack)

6. Package List:

Red Hat Enterprise Linux Server AUS (v. 6.4):

Source:
kernel-2.6.32-358.93.1.el6.src.rpm

noarch:
kernel-doc-2.6.32-358.93.1.el6.noarch.rpm
kernel-firmware-2.6.32-358.93.1.el6.noarch.rpm

x86_64:
kernel-2.6.32-358.93.1.el6.x86_64.rpm
kernel-debug-2.6.32-358.93.1.el6.x86_64.rpm
kernel-debug-debuginfo-2.6.32-358.93.1.el6.x86_64.rpm
kernel-debug-devel-2.6.32-358.93.1.el6.x86_64.rpm
kernel-debuginfo-2.6.32-358.93.1.el6.x86_64.rpm
kernel-debuginfo-common-x86_64-2.6.32-358.93.1.el6.x86_64.rpm
kernel-devel-2.6.32-358.93.1.el6.x86_64.rpm
kernel-headers-2.6.32-358.93.1.el6.x86_64.rpm
perf-2.6.32-358.93.1.el6.x86_64.rpm
perf-debuginfo-2.6.32-358.93.1.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-358.93.1.el6.x86_64.rpm

Red Hat Enterprise Linux Server Optional AUS (v. 6.4):

Source:
kernel-2.6.32-358.93.1.el6.src.rpm

x86_64:
kernel-debug-debuginfo-2.6.32-358.93.1.el6.x86_64.rpm
kernel-debuginfo-2.6.32-358.93.1.el6.x86_64.rpm
kernel-debuginfo-common-x86_64-2.6.32-358.93.1.el6.x86_64.rpm
perf-debuginfo-2.6.32-358.93.1.el6.x86_64.rpm
python-perf-2.6.32-358.93.1.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-358.93.1.el6.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/cve/CVE-2018-5391
https://access.redhat.com/security/cve/CVE-2018-10675
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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