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Red Hat Security Advisory

Synopsis: Important: kernel security and bug fix update
Advisory ID: RHSA-2018:1196-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2018:1196
Issue date: 2018-04-23
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1. Summary:

An update for kernel is now available for Red Hat Enterprise Linux 5
Extended Lifecycle 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 (v. 5 ELS) – i386, noarch, s390x, x86_64

3. Description:

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

Security Fix(es):

* An industry-wide issue was found in the way many modern microprocessor
designs have implemented speculative execution of instructions (a commonly
used performance optimization). There are three primary variants of the
issue which differ in the way the speculative execution can be exploited.
Variant CVE-2017-5715 triggers the speculative execution by utilizing
branch target injection. It relies on the presence of a precisely-defined
instruction sequence in the privileged code as well as the fact that memory
accesses may cause allocation into the microprocessor’s data cache even for
speculatively executed instructions that never actually commit (retire). As
a result, an unprivileged attacker could use this flaw to cross the syscall
and guest/host boundaries and read privileged memory by conducting targeted
cache side-channel attacks. (CVE-2017-5715, Important, x86-64)

Red Hat would like to thank Google Project Zero for reporting this issue.

Bug Fix(es):

* The Return Trampolines (Retpolines) mechanism is a software construct
that leverages specific knowledge of the underlying hardware to mitigate
the branch target injection, also known as Spectre variant 2 vulnerability
described in CVE-2017-5715. With this update, the support for Retpolines
has been implemented into the Red Hat Enterprise Linux kernel. (BZ#1535650)

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/):

1519780 – CVE-2017-5715 hw: cpu: speculative execution branch target injection

6. Package List:

Red Hat Enterprise Linux Server (v. 5 ELS):

Source:
kernel-2.6.18-430.el5.src.rpm

i386:
kernel-2.6.18-430.el5.i686.rpm
kernel-PAE-2.6.18-430.el5.i686.rpm
kernel-PAE-debuginfo-2.6.18-430.el5.i686.rpm
kernel-PAE-devel-2.6.18-430.el5.i686.rpm
kernel-debug-2.6.18-430.el5.i686.rpm
kernel-debug-debuginfo-2.6.18-430.el5.i686.rpm
kernel-debug-devel-2.6.18-430.el5.i686.rpm
kernel-debuginfo-2.6.18-430.el5.i686.rpm
kernel-debuginfo-common-2.6.18-430.el5.i686.rpm
kernel-devel-2.6.18-430.el5.i686.rpm
kernel-headers-2.6.18-430.el5.i386.rpm
kernel-xen-2.6.18-430.el5.i686.rpm
kernel-xen-debuginfo-2.6.18-430.el5.i686.rpm
kernel-xen-devel-2.6.18-430.el5.i686.rpm

noarch:
kernel-doc-2.6.18-430.el5.noarch.rpm

s390x:
kernel-2.6.18-430.el5.s390x.rpm
kernel-debug-2.6.18-430.el5.s390x.rpm
kernel-debug-debuginfo-2.6.18-430.el5.s390x.rpm
kernel-debug-devel-2.6.18-430.el5.s390x.rpm
kernel-debuginfo-2.6.18-430.el5.s390x.rpm
kernel-debuginfo-common-2.6.18-430.el5.s390x.rpm
kernel-devel-2.6.18-430.el5.s390x.rpm
kernel-headers-2.6.18-430.el5.s390x.rpm
kernel-kdump-2.6.18-430.el5.s390x.rpm
kernel-kdump-debuginfo-2.6.18-430.el5.s390x.rpm
kernel-kdump-devel-2.6.18-430.el5.s390x.rpm

x86_64:
kernel-2.6.18-430.el5.x86_64.rpm
kernel-debug-2.6.18-430.el5.x86_64.rpm
kernel-debug-debuginfo-2.6.18-430.el5.x86_64.rpm
kernel-debug-devel-2.6.18-430.el5.x86_64.rpm
kernel-debuginfo-2.6.18-430.el5.x86_64.rpm
kernel-debuginfo-common-2.6.18-430.el5.x86_64.rpm
kernel-devel-2.6.18-430.el5.x86_64.rpm
kernel-headers-2.6.18-430.el5.x86_64.rpm
kernel-xen-2.6.18-430.el5.x86_64.rpm
kernel-xen-debuginfo-2.6.18-430.el5.x86_64.rpm
kernel-xen-devel-2.6.18-430.el5.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/updates/classification/#important
https://access.redhat.com/security/vulnerabilities/speculativeexecution
https://access.redhat.com/security/cve/CVE-2017-5715

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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