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Red Hat 7: RHSA-2018-2772-01 Important: Kernel-Alt Security Fix

red hat
Calendar Grey September 25, 2018
Scroller Redhat Esm H88
A significant enhancement has been released for kernel-alt in Red Hat Enterprise Linux 7 to tackle severe security vulnerabilities.
An update for kernel-alt is now available for Red Hat Enterprise Linux 7

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.

Summary

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 “sysfs spec_store_bypass” 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)

Topics%20covered

Topics Covered

security advisory bug fix important Red Hat Enterprise info leak kernel-alt Dos threat

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

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

Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

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

Topic

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 impactof Important. A Common Vulnerability Scoring System (CVSS) base score,which gives a detailed severity rating, is available for each vulnerabilityfrom the CVE link(s) in the References section.

Topics%20covered

Topics Covered

security advisory bug fix important Red Hat Enterprise info leak kernel-alt Dos threat

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

Bugs Fixed

1549621 - CVE-2017-18202 kernel: Infoleak/use-after-free in __oom_reap_task_mm function in mm/oom_kill.c

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