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Red Hat Security Advisory

Synopsis: Important: kernel security and bug fix update
Advisory ID: RHSA-2018:0151-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2018:0151
Issue date: 2018-01-25
CVE Names: CVE-2015-8539 CVE-2017-7472 CVE-2017-12192
CVE-2017-12193 CVE-2017-15649
=====================================================================

1. Summary:

An update for kernel is now available for Red Hat Enterprise Linux 7.

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 Client (v. 7) – noarch, x86_64
Red Hat Enterprise Linux Client Optional (v. 7) – x86_64
Red Hat Enterprise Linux ComputeNode (v. 7) – noarch, x86_64
Red Hat Enterprise Linux ComputeNode Optional (v. 7) – x86_64
Red Hat Enterprise Linux Server (v. 7) – noarch, ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Server Optional (v. 7) – ppc64, ppc64le, x86_64
Red Hat Enterprise Linux Workstation (v. 7) – noarch, x86_64
Red Hat Enterprise Linux Workstation Optional (v. 7) – 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.

Note: This issue is present in hardware and cannot be fully fixed via
software update. The updated kernel packages provide software mitigation
for this hardware issue at a cost of potential performance penalty. Please
refer to References section for further information about this issue and
the performance impact.

In this update initial mitigations for IBM Power (PowerPC) and IBM zSeries
(S390) architectures are provided.

* 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. This fix specifically addresses S390
processors. (CVE-2017-5715, Important)

* Variant CVE-2017-5753 triggers the speculative execution by performing a
bounds-check bypass. 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
boundary and read privileged memory by conducting targeted cache
side-channel attacks. This fix specifically addresses S390 and PowerPC
processors. (CVE-2017-5753, Important)

* Variant CVE-2017-5754 relies on the fact that, on impacted
microprocessors, during speculative execution of instruction permission
faults, exception generation triggered by a faulting access is suppressed
until the retirement of the whole instruction block. In a combination with
the fact that memory accesses may populate the cache even when the block is
being dropped and never committed (executed), an unprivileged local
attacker could use this flaw to read privileged (kernel space) memory by
conducting targeted cache side-channel attacks. Note: CVE-2017-5754 affects
Intel x86-64 microprocessors. AMD x86-64 microprocessors are not affected
by this issue. This fix specifically addresses PowerPC processors.
(CVE-2017-5754, Important)

Red Hat would like to thank Google Project Zero for reporting
CVE-2017-5715, CVE-2017-5753, and CVE-2017-5754.

This update also fixes the following security issues and bugs:

Space precludes documenting all of the bug fixes and enhancements included
in this advisory. To see the complete list of bug fixes and enhancements,
refer to the following KnowledgeBase article:
https://access.redhat.com/articles/3327131.

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/):

1284450 – CVE-2015-8539 kernel: local privesc in key management
1442086 – CVE-2017-7472 kernel: keyctl_set_reqkey_keyring() leaks thread keyrings
1493435 – CVE-2017-12192 kernel: NULL pointer dereference due to KEYCTL_READ on negative key
1501215 – CVE-2017-12193 kernel: Null pointer dereference due to incorrect node-splitting in assoc_array implementation
1504574 – CVE-2017-15649 kernel: Use-after-free in the af_packet.c
1519778 – CVE-2017-5753 hw: cpu: speculative execution bounds-check bypass
1519780 – CVE-2017-5715 hw: cpu: speculative execution branch target injection
1519781 – CVE-2017-5754 hw: cpu: speculative execution permission faults handling

6. Package List:

Red Hat Enterprise Linux Client (v. 7):

Source:
kernel-3.10.0-693.17.1.el7.src.rpm

noarch:
kernel-abi-whitelists-3.10.0-693.17.1.el7.noarch.rpm
kernel-doc-3.10.0-693.17.1.el7.noarch.rpm

x86_64:
kernel-3.10.0-693.17.1.el7.x86_64.rpm
kernel-debug-3.10.0-693.17.1.el7.x86_64.rpm
kernel-debug-debuginfo-3.10.0-693.17.1.el7.x86_64.rpm
kernel-debug-devel-3.10.0-693.17.1.el7.x86_64.rpm
kernel-debuginfo-3.10.0-693.17.1.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-693.17.1.el7.x86_64.rpm
kernel-devel-3.10.0-693.17.1.el7.x86_64.rpm
kernel-headers-3.10.0-693.17.1.el7.x86_64.rpm
kernel-tools-3.10.0-693.17.1.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-693.17.1.el7.x86_64.rpm
kernel-tools-libs-3.10.0-693.17.1.el7.x86_64.rpm
perf-3.10.0-693.17.1.el7.x86_64.rpm
perf-debuginfo-3.10.0-693.17.1.el7.x86_64.rpm
python-perf-3.10.0-693.17.1.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-693.17.1.el7.x86_64.rpm

Red Hat Enterprise Linux Client Optional (v. 7):

x86_64:
kernel-debug-debuginfo-3.10.0-693.17.1.el7.x86_64.rpm
kernel-debuginfo-3.10.0-693.17.1.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-693.17.1.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-693.17.1.el7.x86_64.rpm
kernel-tools-libs-devel-3.10.0-693.17.1.el7.x86_64.rpm
perf-debuginfo-3.10.0-693.17.1.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-693.17.1.el7.x86_64.rpm

Red Hat Enterprise Linux ComputeNode (v. 7):

Source:
kernel-3.10.0-693.17.1.el7.src.rpm

noarch:
kernel-abi-whitelists-3.10.0-693.17.1.el7.noarch.rpm
kernel-doc-3.10.0-693.17.1.el7.noarch.rpm

Red Hat Enterprise Linux ComputeNode Optional (v. 7):

Red Hat Enterprise Linux Server (v. 7):

Source:
kernel-3.10.0-693.17.1.el7.src.rpm

noarch:
kernel-abi-whitelists-3.10.0-693.17.1.el7.noarch.rpm
kernel-doc-3.10.0-693.17.1.el7.noarch.rpm

ppc64:
kernel-3.10.0-693.17.1.el7.ppc64.rpm
kernel-bootwrapper-3.10.0-693.17.1.el7.ppc64.rpm
kernel-debug-3.10.0-693.17.1.el7.ppc64.rpm
kernel-debug-debuginfo-3.10.0-693.17.1.el7.ppc64.rpm
kernel-debug-devel-3.10.0-693.17.1.el7.ppc64.rpm
kernel-debuginfo-3.10.0-693.17.1.el7.ppc64.rpm
kernel-debuginfo-common-ppc64-3.10.0-693.17.1.el7.ppc64.rpm
kernel-devel-3.10.0-693.17.1.el7.ppc64.rpm
kernel-headers-3.10.0-693.17.1.el7.ppc64.rpm
kernel-tools-3.10.0-693.17.1.el7.ppc64.rpm
kernel-tools-debuginfo-3.10.0-693.17.1.el7.ppc64.rpm
kernel-tools-libs-3.10.0-693.17.1.el7.ppc64.rpm
perf-3.10.0-693.17.1.el7.ppc64.rpm
perf-debuginfo-3.10.0-693.17.1.el7.ppc64.rpm
python-perf-3.10.0-693.17.1.el7.ppc64.rpm
python-perf-debuginfo-3.10.0-693.17.1.el7.ppc64.rpm

ppc64le:
kernel-3.10.0-693.17.1.el7.ppc64le.rpm
kernel-bootwrapper-3.10.0-693.17.1.el7.ppc64le.rpm
kernel-debug-3.10.0-693.17.1.el7.ppc64le.rpm
kernel-debug-debuginfo-3.10.0-693.17.1.el7.ppc64le.rpm
kernel-debuginfo-3.10.0-693.17.1.el7.ppc64le.rpm
kernel-debuginfo-common-ppc64le-3.10.0-693.17.1.el7.ppc64le.rpm
kernel-devel-3.10.0-693.17.1.el7.ppc64le.rpm
kernel-headers-3.10.0-693.17.1.el7.ppc64le.rpm
kernel-tools-3.10.0-693.17.1.el7.ppc64le.rpm
kernel-tools-debuginfo-3.10.0-693.17.1.el7.ppc64le.rpm
kernel-tools-libs-3.10.0-693.17.1.el7.ppc64le.rpm
perf-3.10.0-693.17.1.el7.ppc64le.rpm
perf-debuginfo-3.10.0-693.17.1.el7.ppc64le.rpm
python-perf-3.10.0-693.17.1.el7.ppc64le.rpm
python-perf-debuginfo-3.10.0-693.17.1.el7.ppc64le.rpm

s390x:
kernel-3.10.0-693.17.1.el7.s390x.rpm
kernel-debug-3.10.0-693.17.1.el7.s390x.rpm
kernel-debug-debuginfo-3.10.0-693.17.1.el7.s390x.rpm
kernel-debug-devel-3.10.0-693.17.1.el7.s390x.rpm
kernel-debuginfo-3.10.0-693.17.1.el7.s390x.rpm
kernel-debuginfo-common-s390x-3.10.0-693.17.1.el7.s390x.rpm
kernel-devel-3.10.0-693.17.1.el7.s390x.rpm
kernel-headers-3.10.0-693.17.1.el7.s390x.rpm
kernel-kdump-3.10.0-693.17.1.el7.s390x.rpm
kernel-kdump-debuginfo-3.10.0-693.17.1.el7.s390x.rpm
kernel-kdump-devel-3.10.0-693.17.1.el7.s390x.rpm
perf-3.10.0-693.17.1.el7.s390x.rpm
perf-debuginfo-3.10.0-693.17.1.el7.s390x.rpm
python-perf-3.10.0-693.17.1.el7.s390x.rpm
python-perf-debuginfo-3.10.0-693.17.1.el7.s390x.rpm

Red Hat Enterprise Linux Server Optional (v. 7):

ppc64:
kernel-debug-debuginfo-3.10.0-693.17.1.el7.ppc64.rpm
kernel-debuginfo-3.10.0-693.17.1.el7.ppc64.rpm
kernel-debuginfo-common-ppc64-3.10.0-693.17.1.el7.ppc64.rpm
kernel-tools-debuginfo-3.10.0-693.17.1.el7.ppc64.rpm
kernel-tools-libs-devel-3.10.0-693.17.1.el7.ppc64.rpm
perf-debuginfo-3.10.0-693.17.1.el7.ppc64.rpm
python-perf-debuginfo-3.10.0-693.17.1.el7.ppc64.rpm

ppc64le:
kernel-debug-debuginfo-3.10.0-693.17.1.el7.ppc64le.rpm
kernel-debug-devel-3.10.0-693.17.1.el7.ppc64le.rpm
kernel-debuginfo-3.10.0-693.17.1.el7.ppc64le.rpm
kernel-debuginfo-common-ppc64le-3.10.0-693.17.1.el7.ppc64le.rpm
kernel-tools-debuginfo-3.10.0-693.17.1.el7.ppc64le.rpm
kernel-tools-libs-devel-3.10.0-693.17.1.el7.ppc64le.rpm
perf-debuginfo-3.10.0-693.17.1.el7.ppc64le.rpm
python-perf-debuginfo-3.10.0-693.17.1.el7.ppc64le.rpm

Red Hat Enterprise Linux Workstation (v. 7):

Source:
kernel-3.10.0-693.17.1.el7.src.rpm

noarch:
kernel-abi-whitelists-3.10.0-693.17.1.el7.noarch.rpm
kernel-doc-3.10.0-693.17.1.el7.noarch.rpm

Red Hat Enterprise Linux Workstation Optional (v. 7):

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-2015-8539
https://access.redhat.com/security/cve/CVE-2017-7472
https://access.redhat.com/security/cve/CVE-2017-12192
https://access.redhat.com/security/cve/CVE-2017-12193
https://access.redhat.com/security/cve/CVE-2017-15649
https://access.redhat.com/security/updates/classification/#important
https://access.redhat.com/security/vulnerabilities/speculativeexecution
https://access.redhat.com/security/cve/CVE-2017-5753
https://access.redhat.com/security/cve/CVE-2017-5715
https://access.redhat.com/security/cve/CVE-2017-5754
https://access.redhat.com/articles/3327131

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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