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Red Hat Security Advisory

Synopsis: Important: kernel security and bug fix update
Advisory ID: RHSA-2018:1737-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2018:1737
Issue date: 2018-05-29
CVE Names: CVE-2017-18017 CVE-2018-3639
=====================================================================

1. Summary:

An update for kernel is now available for Red Hat Enterprise Linux 7.3
Extended 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 ComputeNode EUS (v. 7.3) – noarch, x86_64
Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.3) – x86_64
Red Hat Enterprise Linux Server EUS (v. 7.3) – noarch, ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Server Optional EUS (v. 7.3) – ppc64, ppc64le, 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 Load & Store instructions
(a commonly used performance optimization). It relies on the presence of a
precisely-defined instruction sequence in the privileged code as well as
the fact that memory read from address to which a recent memory write has
occurred may see an older value and subsequently cause an update 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 read privileged memory by conducting targeted cache
side-channel attacks. (CVE-2018-3639)

Note: This issue is present in hardware and cannot be fully fixed via
software update. The updated kernel packages provide software side of the
mitigation for this hardware issue. To be fully functional, up-to-date CPU
microcode applied on the system might be required. Please refer to
References section for further information about this issue, CPU microcode
requirements and the potential performance impact.

In this update, mitigation for PowerPC architecture is provided.

* kernel: netfilter: use-after-free in tcpmss_mangle_packet function in
net/netfilter/xt_TCPMSS.c (CVE-2017-18017)

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 Ken Johnson (Microsoft Security Response
Center) and Jann Horn (Google Project Zero) for reporting CVE-2018-3639.

Bug Fix(es):

These updated kernel packages include also numerous bug fixes. Space
precludes documenting all of these bug fixes in this advisory. See the bug
fix descriptions in the related Knowledge Article:
https://access.redhat.com/articles/3461451

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/):

1531135 – CVE-2017-18017 kernel: netfilter: use-after-free in tcpmss_mangle_packet function in net/netfilter/xt_TCPMSS.c
1566890 – CVE-2018-3639 hw: cpu: speculative store bypass

6. Package List:

Red Hat Enterprise Linux ComputeNode EUS (v. 7.3):

Source:
kernel-3.10.0-514.51.1.el7.src.rpm

noarch:
kernel-abi-whitelists-3.10.0-514.51.1.el7.noarch.rpm
kernel-doc-3.10.0-514.51.1.el7.noarch.rpm

x86_64:
kernel-3.10.0-514.51.1.el7.x86_64.rpm
kernel-debug-3.10.0-514.51.1.el7.x86_64.rpm
kernel-debug-debuginfo-3.10.0-514.51.1.el7.x86_64.rpm
kernel-debug-devel-3.10.0-514.51.1.el7.x86_64.rpm
kernel-debuginfo-3.10.0-514.51.1.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-514.51.1.el7.x86_64.rpm
kernel-devel-3.10.0-514.51.1.el7.x86_64.rpm
kernel-headers-3.10.0-514.51.1.el7.x86_64.rpm
kernel-tools-3.10.0-514.51.1.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-514.51.1.el7.x86_64.rpm
kernel-tools-libs-3.10.0-514.51.1.el7.x86_64.rpm
perf-3.10.0-514.51.1.el7.x86_64.rpm
perf-debuginfo-3.10.0-514.51.1.el7.x86_64.rpm
python-perf-3.10.0-514.51.1.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-514.51.1.el7.x86_64.rpm

Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.3):

x86_64:
kernel-debug-debuginfo-3.10.0-514.51.1.el7.x86_64.rpm
kernel-debuginfo-3.10.0-514.51.1.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-514.51.1.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-514.51.1.el7.x86_64.rpm
kernel-tools-libs-devel-3.10.0-514.51.1.el7.x86_64.rpm
perf-debuginfo-3.10.0-514.51.1.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-514.51.1.el7.x86_64.rpm

Red Hat Enterprise Linux Server EUS (v. 7.3):

Source:
kernel-3.10.0-514.51.1.el7.src.rpm

noarch:
kernel-abi-whitelists-3.10.0-514.51.1.el7.noarch.rpm
kernel-doc-3.10.0-514.51.1.el7.noarch.rpm

ppc64:
kernel-3.10.0-514.51.1.el7.ppc64.rpm
kernel-bootwrapper-3.10.0-514.51.1.el7.ppc64.rpm
kernel-debug-3.10.0-514.51.1.el7.ppc64.rpm
kernel-debug-debuginfo-3.10.0-514.51.1.el7.ppc64.rpm
kernel-debug-devel-3.10.0-514.51.1.el7.ppc64.rpm
kernel-debuginfo-3.10.0-514.51.1.el7.ppc64.rpm
kernel-debuginfo-common-ppc64-3.10.0-514.51.1.el7.ppc64.rpm
kernel-devel-3.10.0-514.51.1.el7.ppc64.rpm
kernel-headers-3.10.0-514.51.1.el7.ppc64.rpm
kernel-tools-3.10.0-514.51.1.el7.ppc64.rpm
kernel-tools-debuginfo-3.10.0-514.51.1.el7.ppc64.rpm
kernel-tools-libs-3.10.0-514.51.1.el7.ppc64.rpm
perf-3.10.0-514.51.1.el7.ppc64.rpm
perf-debuginfo-3.10.0-514.51.1.el7.ppc64.rpm
python-perf-3.10.0-514.51.1.el7.ppc64.rpm
python-perf-debuginfo-3.10.0-514.51.1.el7.ppc64.rpm

ppc64le:
kernel-3.10.0-514.51.1.el7.ppc64le.rpm
kernel-bootwrapper-3.10.0-514.51.1.el7.ppc64le.rpm
kernel-debug-3.10.0-514.51.1.el7.ppc64le.rpm
kernel-debug-debuginfo-3.10.0-514.51.1.el7.ppc64le.rpm
kernel-debuginfo-3.10.0-514.51.1.el7.ppc64le.rpm
kernel-debuginfo-common-ppc64le-3.10.0-514.51.1.el7.ppc64le.rpm
kernel-devel-3.10.0-514.51.1.el7.ppc64le.rpm
kernel-headers-3.10.0-514.51.1.el7.ppc64le.rpm
kernel-tools-3.10.0-514.51.1.el7.ppc64le.rpm
kernel-tools-debuginfo-3.10.0-514.51.1.el7.ppc64le.rpm
kernel-tools-libs-3.10.0-514.51.1.el7.ppc64le.rpm
perf-3.10.0-514.51.1.el7.ppc64le.rpm
perf-debuginfo-3.10.0-514.51.1.el7.ppc64le.rpm
python-perf-3.10.0-514.51.1.el7.ppc64le.rpm
python-perf-debuginfo-3.10.0-514.51.1.el7.ppc64le.rpm

s390x:
kernel-3.10.0-514.51.1.el7.s390x.rpm
kernel-debug-3.10.0-514.51.1.el7.s390x.rpm
kernel-debug-debuginfo-3.10.0-514.51.1.el7.s390x.rpm
kernel-debug-devel-3.10.0-514.51.1.el7.s390x.rpm
kernel-debuginfo-3.10.0-514.51.1.el7.s390x.rpm
kernel-debuginfo-common-s390x-3.10.0-514.51.1.el7.s390x.rpm
kernel-devel-3.10.0-514.51.1.el7.s390x.rpm
kernel-headers-3.10.0-514.51.1.el7.s390x.rpm
kernel-kdump-3.10.0-514.51.1.el7.s390x.rpm
kernel-kdump-debuginfo-3.10.0-514.51.1.el7.s390x.rpm
kernel-kdump-devel-3.10.0-514.51.1.el7.s390x.rpm
perf-3.10.0-514.51.1.el7.s390x.rpm
perf-debuginfo-3.10.0-514.51.1.el7.s390x.rpm
python-perf-3.10.0-514.51.1.el7.s390x.rpm
python-perf-debuginfo-3.10.0-514.51.1.el7.s390x.rpm

Red Hat Enterprise Linux Server Optional EUS (v. 7.3):

ppc64:
kernel-debug-debuginfo-3.10.0-514.51.1.el7.ppc64.rpm
kernel-debuginfo-3.10.0-514.51.1.el7.ppc64.rpm
kernel-debuginfo-common-ppc64-3.10.0-514.51.1.el7.ppc64.rpm
kernel-tools-debuginfo-3.10.0-514.51.1.el7.ppc64.rpm
kernel-tools-libs-devel-3.10.0-514.51.1.el7.ppc64.rpm
perf-debuginfo-3.10.0-514.51.1.el7.ppc64.rpm
python-perf-debuginfo-3.10.0-514.51.1.el7.ppc64.rpm

ppc64le:
kernel-debug-debuginfo-3.10.0-514.51.1.el7.ppc64le.rpm
kernel-debug-devel-3.10.0-514.51.1.el7.ppc64le.rpm
kernel-debuginfo-3.10.0-514.51.1.el7.ppc64le.rpm
kernel-debuginfo-common-ppc64le-3.10.0-514.51.1.el7.ppc64le.rpm
kernel-tools-debuginfo-3.10.0-514.51.1.el7.ppc64le.rpm
kernel-tools-libs-devel-3.10.0-514.51.1.el7.ppc64le.rpm
perf-debuginfo-3.10.0-514.51.1.el7.ppc64le.rpm
python-perf-debuginfo-3.10.0-514.51.1.el7.ppc64le.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-2017-18017
https://access.redhat.com/security/cve/CVE-2018-3639
https://access.redhat.com/security/updates/classification/#important
https://access.redhat.com/security/vulnerabilities/ssbd
https://access.redhat.com/articles/3461451

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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