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Red Hat Enterprise Linux 7.5 RHSA-2018:3459-01 Important Kernel Security

red hat
Calendar Grey November 6, 2018
Dist Redhat Esm H88
Crucial kernel upgrade for Red Hat Enterprise Linux 7.5 resolves vulnerabilities and incorporates various bug resolutions.
An update for kernel is now available for Red Hat Enterprise Linux 7.5 Extended Update Support

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 packages contain the Linux kernel, the core of any Linux operating system.
Security Fix(es):
* A flaw named FragmentSmack was found in the way the Linux kernel handled reassembly of fragmented IPv4 and IPv6 packets. A remote attacker could use this flaw to trigger time and calculation expensive fragment reassembly algorithm by sending specially crafted packets which could lead to a CPU saturation and hence a denial of service on the system. (CVE-2018-5391)
* kernel: out-of-bounds access in the show_timer function in kernel/time/posix-timers.c (CVE-2017-18344)
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 Juha-Matti Tilli (Aalto University - Department of Communications and Networking and Nokia Bell Labs) for reporting CVE-2018-5391.
Bug Fix(es):
These updated kernel packages include also numerous bug fixes. Space precludes documenting all of the bug fixes in this advisory. See the descriptions in the related Knowledge Article: https://access.redhat.com/articles/3674801

Topics%20covered

Topics Covered

security advisory Red Hat bug fix DoS important kernel FragmentSmack

References

https://access.redhat.com/security/cve/CVE-2017-18344 https://access.redhat.com/security/cve/CVE-2018-5391 https://access.redhat.com/security/updates/classification#important https://access.redhat.com/articles/3553061 https://access.redhat.com/articles/3674801

Package List

Red Hat Enterprise Linux ComputeNode EUS (v. 7.5):
Source: kernel-3.10.0-862.20.2.el7.src.rpm
noarch: kernel-abi-whitelists-3.10.0-862.20.2.el7.noarch.rpm kernel-doc-3.10.0-862.20.2.el7.noarch.rpm
x86_64: kernel-3.10.0-862.20.2.el7.x86_64.rpm kernel-debug-3.10.0-862.20.2.el7.x86_64.rpm kernel-debug-debuginfo-3.10.0-862.20.2.el7.x86_64.rpm kernel-debug-devel-3.10.0-862.20.2.el7.x86_64.rpm kernel-debuginfo-3.10.0-862.20.2.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-862.20.2.el7.x86_64.rpm kernel-devel-3.10.0-862.20.2.el7.x86_64.rpm kernel-headers-3.10.0-862.20.2.el7.x86_64.rpm kernel-tools-3.10.0-862.20.2.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-862.20.2.el7.x86_64.rpm kernel-tools-libs-3.10.0-862.20.2.el7.x86_64.rpm perf-3.10.0-862.20.2.el7.x86_64.rpm perf-debuginfo-3.10.0-862.20.2.el7.x86_64.rpm python-perf-3.10.0-862.20.2.el7.x86_64.rpm python-perf-debuginfo-3.10.0-862.20.2.el7.x86_64.rpm
Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.5):
x86_64: kernel-debug-debuginfo-3.10.0-862.20.2.el7.x86_64.rpm kernel-debuginfo-3.10.0-862.20.2.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-862.20.2.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-862.20.2.el7.x86_64.rpm kernel-tools-libs-devel-3.10.0-862.20.2.el7.x86_64.rpm

Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2018:3459-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2018:3459
Issue date: 2018-11-06

Topic

An update for kernel is now available for Red Hat Enterprise Linux 7.5Extended Update Support.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 Red Hat bug fix DoS important kernel FragmentSmack

Relevant Releases Architectures

Red Hat Enterprise Linux ComputeNode EUS (v. 7.5) - noarch, x86_64

Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.5) - x86_64

Red Hat Enterprise Linux Server EUS (v. 7.5) - noarch, ppc64, ppc64le, s390x, x86_64

Red Hat Enterprise Linux Server Optional EUS (v. 7.5) - ppc64, ppc64le, x86_64

Bugs Fixed

1609664 - CVE-2018-5391 kernel: IP fragments with random offsets allow a remote denial of service (FragmentSmack)

1610958 - CVE-2017-18344 kernel: out-of-bounds access in the show_timer function in kernel/time/posix-timers.c

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