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Red Hat Enterprise Linux 7.4: RHSA-2018-3540 Important Kernel Bug Fix

red hat
Calendar Grey November 13, 2018
Dist Redhat Esm H88
Ubuntu releases patch for 20.04 to improve security protocols and boost overall system performance.
An update for kernel is now available for Red Hat Enterprise Linux 7.4 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)
* kernel: mm: use-after-free in do_get_mempolicy function allows local DoS or other unspecified impact (CVE-2018-10675)
* kernel: Integer overflow in Linux's create_elf_tables function (CVE-2018-14634)
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 and Qualys Research Labs for reporting CVE-2018-14634.
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/3684891

Topics%20covered

Topics Covered

security advisory denial of service bug fix Red Hat Enterprise Linux important kernel attack

References

https://access.redhat.com/security/cve/CVE-2017-18344 https://access.redhat.com/security/cve/CVE-2018-5391 https://access.redhat.com/security/cve/CVE-2018-10675 https://access.redhat.com/security/cve/CVE-2018-14634 https://access.redhat.com/security/updates/classification/#important https://access.redhat.com/articles/3553061 https://access.redhat.com/security/vulnerabilities/mutagen-astronomy https://access.redhat.com/articles/3684891

Package List

Red Hat Enterprise Linux ComputeNode EUS (v. 7.4):
Source: kernel-3.10.0-693.43.1.el7.src.rpm
noarch: kernel-abi-whitelists-3.10.0-693.43.1.el7.noarch.rpm kernel-doc-3.10.0-693.43.1.el7.noarch.rpm
x86_64: kernel-3.10.0-693.43.1.el7.x86_64.rpm kernel-debug-3.10.0-693.43.1.el7.x86_64.rpm kernel-debug-debuginfo-3.10.0-693.43.1.el7.x86_64.rpm kernel-debug-devel-3.10.0-693.43.1.el7.x86_64.rpm kernel-debuginfo-3.10.0-693.43.1.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-693.43.1.el7.x86_64.rpm kernel-devel-3.10.0-693.43.1.el7.x86_64.rpm kernel-headers-3.10.0-693.43.1.el7.x86_64.rpm kernel-tools-3.10.0-693.43.1.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-693.43.1.el7.x86_64.rpm kernel-tools-libs-3.10.0-693.43.1.el7.x86_64.rpm perf-3.10.0-693.43.1.el7.x86_64.rpm perf-debuginfo-3.10.0-693.43.1.el7.x86_64.rpm python-perf-3.10.0-693.43.1.el7.x86_64.rpm python-perf-debuginfo-3.10.0-693.43.1.el7.x86_64.rpm
Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.4):
x86_64: kernel-debug-debuginfo-3.10.0-693.43.1.el7.x86_64.rpm kernel-debuginfo-3.10.0-693.43.1.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-693.43.1.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-693.43.1.el7.x86_64.rpm kernel-tools-libs-devel-3.10.0-693.43.1.el7.x86_64.rpm

Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2018:3540-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2018:3540
Issue date: 2018-11-13

Topic

An update for kernel is now available for Red Hat Enterprise Linux 7.4Extended 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 denial of service bug fix Red Hat Enterprise Linux important kernel attack

Relevant Releases Architectures

Red Hat Enterprise Linux ComputeNode EUS (v. 7.4) - noarch, x86_64

Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.4) - x86_64

Red Hat Enterprise Linux Server EUS (v. 7.4) - noarch, ppc64, ppc64le, s390x, x86_64

Red Hat Enterprise Linux Server Optional EUS (v. 7.4) - ppc64, ppc64le, x86_64

Bugs Fixed

1575065 - CVE-2018-10675 kernel: mm: use-after-free in do_get_mempolicy function allows local DoS or other unspecified impact

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

1624498 - CVE-2018-14634 kernel: Integer overflow in Linux's create_elf_tables function

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