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RedHat 7: RHSA-2018:1355-01 Critical Kernel-RT Update for DoS Risks

red hat
Calendar Grey May 8, 2018
Scroller Redhat
The kernel-rt upgrade includes essential security enhancements for Red Hat Enterprise Linux 7. Discover the steps to implement the current patch today.
An update for kernel-rt 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-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.
Security Fix(es):
* Kernel: KVM: error in exception handling leads to wrong debug stack value (CVE-2018-1087)
* Kernel: error in exception handling leads to DoS (CVE-2018-8897)
* Kernel: ipsec: xfrm: use-after-free leading to potential privilege escalation (CVE-2017-16939)
* kernel: Out-of-bounds write via userland offsets in ebt_entry struct in netfilter/ebtables.c (CVE-2018-1068)
* kernel: ptrace() incorrect error handling leads to corruption and DoS (CVE-2018-1000199)
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 Andy Lutomirski for reporting CVE-2018-1087 and CVE-2018-1000199 and Nick Peterson (Everdox Tech LLC) and Andy Lutomirski for reporting CVE-2018-8897.
Bug Fix(es):
* The kernel-rt packages have been upgraded to the 3.10.0-862.2.3 source tree, which provides a number of bug fixes over the previous version. (BZ#1549768)

Topics%20covered

Topics Covered

security advisory Red Hat privilege escalation DoS important update kernel-rt

References

https://access.redhat.com/security/cve/CVE-2017-16939 https://access.redhat.com/security/cve/CVE-2018-1068 https://access.redhat.com/security/cve/CVE-2018-1087 https://access.redhat.com/security/cve/CVE-2018-8897 https://access.redhat.com/security/cve/CVE-2018-1000199 https://access.redhat.com/security/updates/classification#important https://access.redhat.com/security/vulnerabilities/pop_ss

Package List

Red Hat Enterprise Linux for Real Time for NFV (v. 7):
Source: kernel-rt-3.10.0-862.2.3.rt56.806.el7.src.rpm
noarch: kernel-rt-doc-3.10.0-862.2.3.rt56.806.el7.noarch.rpm
x86_64: kernel-rt-3.10.0-862.2.3.rt56.806.el7.x86_64.rpm kernel-rt-debug-3.10.0-862.2.3.rt56.806.el7.x86_64.rpm kernel-rt-debug-debuginfo-3.10.0-862.2.3.rt56.806.el7.x86_64.rpm kernel-rt-debug-devel-3.10.0-862.2.3.rt56.806.el7.x86_64.rpm kernel-rt-debug-kvm-3.10.0-862.2.3.rt56.806.el7.x86_64.rpm kernel-rt-debug-kvm-debuginfo-3.10.0-862.2.3.rt56.806.el7.x86_64.rpm kernel-rt-debuginfo-3.10.0-862.2.3.rt56.806.el7.x86_64.rpm kernel-rt-debuginfo-common-x86_64-3.10.0-862.2.3.rt56.806.el7.x86_64.rpm kernel-rt-devel-3.10.0-862.2.3.rt56.806.el7.x86_64.rpm kernel-rt-kvm-3.10.0-862.2.3.rt56.806.el7.x86_64.rpm kernel-rt-kvm-debuginfo-3.10.0-862.2.3.rt56.806.el7.x86_64.rpm kernel-rt-trace-3.10.0-862.2.3.rt56.806.el7.x86_64.rpm kernel-rt-trace-debuginfo-3.10.0-862.2.3.rt56.806.el7.x86_64.rpm kernel-rt-trace-devel-3.10.0-862.2.3.rt56.806.el7.x86_64.rpm kernel-rt-trace-kvm-3.10.0-862.2.3.rt56.806.el7.x86_64.rpm kernel-rt-trace-kvm-debuginfo-3.10.0-862.2.3.rt56.806.el7.x86_64.rpm
Red Hat Enterprise Linux Realtime (v. 7):
Source: kernel-rt-3.10.0-862.2.3.rt56.806.el7.src.rpm
noarch:

Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2018:1355-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2018:1355
Issue date: 2018-05-08

Topic

An update for kernel-rt 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 Red Hat privilege escalation DoS important update kernel-rt

Relevant Releases Architectures

Red Hat Enterprise Linux Realtime (v. 7) - noarch, x86_64

Red Hat Enterprise Linux for Real Time for NFV (v. 7) - noarch, x86_64

Bugs Fixed

1517220 - CVE-2017-16939 Kernel: ipsec: xfrm: use-after-free leading to potential privilege escalation

1549768 - kernel-rt: update to the RHEL7.5.z batch#1 source tree

1552048 - CVE-2018-1068 kernel: Out-of-bounds write via userland offsets in ebt_entry struct in netfilter/ebtables.c

1566837 - CVE-2018-1087 Kernel: KVM: error in exception handling leads to wrong debug stack value

1567074 - CVE-2018-8897 Kernel: error in exception handling leads to DoS

1568477 - CVE-2018-1000199 kernel: ptrace() incorrect error handling leads to corruption and DoS

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