Red Hat Security Advisory 2018-2772-01

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=====================================================================  
Red Hat Security Advisory  
  
Synopsis: Important: kernel-alt security and bug fix update  
Advisory ID: RHSA-2018:2772-01  
Product: Red Hat Enterprise Linux  
Advisory URL: https://access.redhat.com/errata/RHSA-2018:2772  
Issue date: 2018-09-25  
CVE Names: CVE-2017-18202   
=====================================================================  
  
1. Summary:  
  
An update for kernel-alt 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 for ARM and IBM Power LE (POWER9) Server (v. 7) - aarch64, noarch, ppc64le, s390x  
Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) - aarch64, noarch, ppc64le  
  
3. Description:  
  
The kernel-alt packages provide the Linux kernel version 4.x.  
  
Security Fix(es):  
  
* kernel: Infoleak/use-after-free in __oom_reap_task_mm function in  
mm/oom_kill.c (CVE-2017-18202)  
  
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.  
  
Bug Fix(es):  
  
* Previously, on certain little-endian variants of IBM Power Systems, there  
was no asysfs spec_store_bypassa file. As a consequence, there was no way  
to indicate the Speculative Store Bypass Disable (SSBD) mitigation status.  
This update adds infrastructure code into the kernel to create the  
/sys/devices/system/cpu/vulnerabilities/* files. As a result, sysfs  
spec_store_bypass shows whether the SSBD mitigation is disabled or enabled.  
(BZ#1602340)  
  
* Previously, the kernel architectures for IBM z Systems were missing  
support to display the status of the Spectre v2 mitigations. As a  
consequence, the /sys/devices/system/cpu/vulnerabilities/spectre_v2 file  
did not exist. With this update, the kernel now shows the status in the  
above mentioned file and as a result, the file now reports either  
"Vulnerable" or "Mitigation: execute trampolines" message. (BZ#1619667)  
  
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/):  
  
1549621 - CVE-2017-18202 kernel: Infoleak/use-after-free in __oom_reap_task_mm function in mm/oom_kill.c  
  
6. Package List:  
  
Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7):  
  
Source:  
kernel-alt-4.14.0-49.13.1.el7a.src.rpm  
  
aarch64:  
kernel-4.14.0-49.13.1.el7a.aarch64.rpm  
kernel-debug-4.14.0-49.13.1.el7a.aarch64.rpm  
kernel-debug-debuginfo-4.14.0-49.13.1.el7a.aarch64.rpm  
kernel-debug-devel-4.14.0-49.13.1.el7a.aarch64.rpm  
kernel-debuginfo-4.14.0-49.13.1.el7a.aarch64.rpm  
kernel-debuginfo-common-aarch64-4.14.0-49.13.1.el7a.aarch64.rpm  
kernel-devel-4.14.0-49.13.1.el7a.aarch64.rpm  
kernel-headers-4.14.0-49.13.1.el7a.aarch64.rpm  
kernel-tools-4.14.0-49.13.1.el7a.aarch64.rpm  
kernel-tools-debuginfo-4.14.0-49.13.1.el7a.aarch64.rpm  
kernel-tools-libs-4.14.0-49.13.1.el7a.aarch64.rpm  
perf-4.14.0-49.13.1.el7a.aarch64.rpm  
perf-debuginfo-4.14.0-49.13.1.el7a.aarch64.rpm  
python-perf-4.14.0-49.13.1.el7a.aarch64.rpm  
python-perf-debuginfo-4.14.0-49.13.1.el7a.aarch64.rpm  
  
noarch:  
kernel-abi-whitelists-4.14.0-49.13.1.el7a.noarch.rpm  
kernel-doc-4.14.0-49.13.1.el7a.noarch.rpm  
  
ppc64le:  
kernel-4.14.0-49.13.1.el7a.ppc64le.rpm  
kernel-bootwrapper-4.14.0-49.13.1.el7a.ppc64le.rpm  
kernel-debug-4.14.0-49.13.1.el7a.ppc64le.rpm  
kernel-debug-debuginfo-4.14.0-49.13.1.el7a.ppc64le.rpm  
kernel-debuginfo-4.14.0-49.13.1.el7a.ppc64le.rpm  
kernel-debuginfo-common-ppc64le-4.14.0-49.13.1.el7a.ppc64le.rpm  
kernel-devel-4.14.0-49.13.1.el7a.ppc64le.rpm  
kernel-headers-4.14.0-49.13.1.el7a.ppc64le.rpm  
kernel-tools-4.14.0-49.13.1.el7a.ppc64le.rpm  
kernel-tools-debuginfo-4.14.0-49.13.1.el7a.ppc64le.rpm  
kernel-tools-libs-4.14.0-49.13.1.el7a.ppc64le.rpm  
perf-4.14.0-49.13.1.el7a.ppc64le.rpm  
perf-debuginfo-4.14.0-49.13.1.el7a.ppc64le.rpm  
python-perf-4.14.0-49.13.1.el7a.ppc64le.rpm  
python-perf-debuginfo-4.14.0-49.13.1.el7a.ppc64le.rpm  
  
s390x:  
kernel-4.14.0-49.13.1.el7a.s390x.rpm  
kernel-debug-4.14.0-49.13.1.el7a.s390x.rpm  
kernel-debug-debuginfo-4.14.0-49.13.1.el7a.s390x.rpm  
kernel-debug-devel-4.14.0-49.13.1.el7a.s390x.rpm  
kernel-debuginfo-4.14.0-49.13.1.el7a.s390x.rpm  
kernel-debuginfo-common-s390x-4.14.0-49.13.1.el7a.s390x.rpm  
kernel-devel-4.14.0-49.13.1.el7a.s390x.rpm  
kernel-headers-4.14.0-49.13.1.el7a.s390x.rpm  
kernel-kdump-4.14.0-49.13.1.el7a.s390x.rpm  
kernel-kdump-debuginfo-4.14.0-49.13.1.el7a.s390x.rpm  
kernel-kdump-devel-4.14.0-49.13.1.el7a.s390x.rpm  
perf-4.14.0-49.13.1.el7a.s390x.rpm  
perf-debuginfo-4.14.0-49.13.1.el7a.s390x.rpm  
python-perf-4.14.0-49.13.1.el7a.s390x.rpm  
python-perf-debuginfo-4.14.0-49.13.1.el7a.s390x.rpm  
  
Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7):  
  
aarch64:  
kernel-debug-debuginfo-4.14.0-49.13.1.el7a.aarch64.rpm  
kernel-debuginfo-4.14.0-49.13.1.el7a.aarch64.rpm  
kernel-debuginfo-common-aarch64-4.14.0-49.13.1.el7a.aarch64.rpm  
kernel-tools-debuginfo-4.14.0-49.13.1.el7a.aarch64.rpm  
kernel-tools-libs-devel-4.14.0-49.13.1.el7a.aarch64.rpm  
perf-debuginfo-4.14.0-49.13.1.el7a.aarch64.rpm  
python-perf-debuginfo-4.14.0-49.13.1.el7a.aarch64.rpm  
  
noarch:  
kernel-doc-4.14.0-49.13.1.el7a.noarch.rpm  
  
ppc64le:  
kernel-debug-debuginfo-4.14.0-49.13.1.el7a.ppc64le.rpm  
kernel-debug-devel-4.14.0-49.13.1.el7a.ppc64le.rpm  
kernel-debuginfo-4.14.0-49.13.1.el7a.ppc64le.rpm  
kernel-debuginfo-common-ppc64le-4.14.0-49.13.1.el7a.ppc64le.rpm  
kernel-tools-debuginfo-4.14.0-49.13.1.el7a.ppc64le.rpm  
kernel-tools-libs-devel-4.14.0-49.13.1.el7a.ppc64le.rpm  
perf-debuginfo-4.14.0-49.13.1.el7a.ppc64le.rpm  
python-perf-debuginfo-4.14.0-49.13.1.el7a.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-2017-18202  
https://access.redhat.com/security/updates/classification/#important  
https://access.redhat.com/security/cve/CVE-2017-18202  
  
8. Contact:  
  
The Red Hat security contact is <[email protected]>. More contact  
details at https://access.redhat.com/security/team/contact/  
  
Copyright 2018 Red Hat, Inc.  
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