Skip to navigation Skip to main content

Utilities

  • Subscriptions
  • Downloads
  • Containers
  • Support Cases
Red Hat Customer Portal
  • Subscriptions
  • Downloads
  • Containers
  • Support Cases
  • Products & Services

    Products

    Support

    • Production Support
    • Development Support
    • Product Life Cycles

    Services

    • Consulting
    • Technical Account Management
    • Training & Certifications

    Documentation

    • Red Hat Enterprise Linux
    • Red Hat JBoss Enterprise Application Platform
    • Red Hat OpenStack Platform
    • Red Hat OpenShift Container Platform
    All Documentation

    Ecosystem Catalog

    • Red Hat Partner Ecosystem
    • Partner Resources
  • Tools

    Tools

    • Troubleshoot a product issue
    • Packages
    • Errata

    Customer Portal Labs

    • Configuration
    • Deployment
    • Security
    • Troubleshoot
    All labs

    Red Hat Insights

    Increase visibility into IT operations to detect and resolve technical issues before they impact your business.

    Learn More
    Go to Insights
  • Security

    Red Hat Product Security Center

    Engage with our Red Hat Product Security team, access security updates, and ensure your environments are not exposed to any known security vulnerabilities.

    Product Security Center

    Security Updates

    • Security Advisories
    • Red Hat CVE Database
    • Security Labs

    Keep your systems secure with Red Hat's specialized responses to security vulnerabilities.

    View Responses

    Resources

    • Security Blog
    • Security Measurement
    • Severity Ratings
    • Backporting Policies
    • Product Signing (GPG) Keys
  • Community

    Customer Portal Community

    • Discussions
    • Private Groups
    Community Activity

    Customer Events

    • Red Hat Convergence
    • Red Hat Summit

    Stories

    • Red Hat Subscription Value
    • You Asked. We Acted.
    • Open Source Communities
Or troubleshoot an issue.

Select Your Language

  • English
  • Français
  • 한국어
  • 日本語
  • 中文 (中国)

Infrastructure and Management

  • Red Hat Enterprise Linux
  • Red Hat Satellite
  • Red Hat Subscription Management
  • Red Hat Insights
  • Red Hat Ansible Automation Platform

Cloud Computing

  • Red Hat OpenShift
  • Red Hat OpenStack Platform
  • Red Hat OpenShift Container Platform
  • Red Hat OpenShift Data Science
  • Red Hat OpenShift Dedicated
  • Red Hat Advanced Cluster Security for Kubernetes
  • Red Hat Advanced Cluster Management for Kubernetes
  • Red Hat Quay
  • OpenShift Dev Spaces
  • Red Hat OpenShift Service on AWS

Storage

  • Red Hat Gluster Storage
  • Red Hat Hyperconverged Infrastructure
  • Red Hat Ceph Storage
  • Red Hat OpenShift Data Foundation

Runtimes

  • Red Hat Runtimes
  • Red Hat JBoss Enterprise Application Platform
  • Red Hat Data Grid
  • Red Hat JBoss Web Server
  • Red Hat Single Sign On
  • Red Hat support for Spring Boot
  • Red Hat build of Node.js
  • Red Hat build of Quarkus

Integration and Automation

  • Red Hat Application Foundations
  • Red Hat Fuse
  • Red Hat AMQ
  • Red Hat 3scale API Management
All Products
Red Hat Product Errata RHSA-2018:2789 - Security Advisory
Issued:
2018-09-25
Updated:
2018-09-25

RHSA-2018:2789 - Security Advisory

  • Overview
  • Updated Packages

Synopsis

Important: kernel-rt security and bug fix update

Type/Severity

Security Advisory: Important

Red Hat Insights patch analysis

Identify and remediate systems affected by this advisory.

View affected systems

Topic

An update for kernel-rt is now available for Red Hat Enterprise MRG 2.

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.

Description

The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.

Security Fix(es):

  • A flaw named SegmentSmack was found in the way the Linux kernel handled specially crafted TCP packets. A remote attacker could use this flaw to trigger time and calculation expensive calls to tcp_collapse_ofo_queue() and tcp_prune_ofo_queue() functions by sending specially modified packets within ongoing TCP sessions which could lead to a CPU saturation and hence a denial of service on the system. Maintaining the denial of service condition requires continuous two-way TCP sessions to a reachable open port, thus the attacks cannot be performed using spoofed IP addresses. (CVE-2018-5390)

Red Hat would like to thank Juha-Matti Tilli (Aalto University - Department of Communications and Networking and Nokia Bell Labs) for reporting this issue.

Bug Fix(es):

  • The kernel-rt packages have been upgraded to the 3.10.0-693.39.1 source tree, which provides a number of bug fixes over the previous version. (BZ#1616431)
  • Previously, preemption was enabled too early after a context switch. If a task was migrated to another CPU after a context switch, a mismatch between CPU and runqueue during load balancing sometimes occurred. Consequently, a runnable task on an idle CPU failed to run, and the operating system became unresponsive. This update disables preemption in the schedule_tail() function. As a result, CPU migration during post-schedule processing no longer occurs, which prevents the above mismatch. The operating system no longer hangs due to this bug. (BZ#1618466)

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.

Affected Products

  • MRG Realtime 2 x86_64

Fixes

  • BZ - 1601704 - CVE-2018-5390 kernel: TCP segments with random offsets allow a remote denial of service (SegmentSmack)
  • BZ - 1616431 - update the MRG 2.5.z 3.10 kernel-rt sources
  • BZ - 1618466 - RT system hang due to wrong of rq's nr_running [MRG-RT]

CVEs

  • CVE-2018-5390

References

  • https://access.redhat.com/security/updates/classification/#important
Note: More recent versions of these packages may be available. Click a package name for more details.

MRG Realtime 2

SRPM
kernel-rt-3.10.0-693.39.1.rt56.629.el6rt.src.rpm SHA-256: 59fa1b9e52088dab85728655dc4b41a7983afc908c652b3cc9db45a791e178d3
x86_64
kernel-rt-3.10.0-693.39.1.rt56.629.el6rt.x86_64.rpm SHA-256: 06e8974a74e8a2afdf7acb50cc91ab53802ffe6535203fcb92a292ef5fa6eb7c
kernel-rt-debug-3.10.0-693.39.1.rt56.629.el6rt.x86_64.rpm SHA-256: 66ade9651724afd713224a7faf3504b3a452b7697aaa9c7c17c350edcc31f68a
kernel-rt-debug-debuginfo-3.10.0-693.39.1.rt56.629.el6rt.x86_64.rpm SHA-256: 36e667a6ff522a883990c22e73898875b2ae15b39c2ab9ee7690a07d125a2d7c
kernel-rt-debug-devel-3.10.0-693.39.1.rt56.629.el6rt.x86_64.rpm SHA-256: 8d72f38dbadd5a243c1f1eae7b045873bee9d15a3d975b4187b04d962c34e258
kernel-rt-debuginfo-3.10.0-693.39.1.rt56.629.el6rt.x86_64.rpm SHA-256: 5e30981c65112243c85f38a6320246bc48e0406eb4d82f9f8d0f83e7fa9e005d
kernel-rt-debuginfo-common-x86_64-3.10.0-693.39.1.rt56.629.el6rt.x86_64.rpm SHA-256: 9264ee362206ada964f36cb121eb05936944e88dfa5b411e23ef5ea622ab3f9f
kernel-rt-devel-3.10.0-693.39.1.rt56.629.el6rt.x86_64.rpm SHA-256: 20fc044bfb6be6044537379da125bd3084bd14f904a9196e14d6c6decc6af71d
kernel-rt-doc-3.10.0-693.39.1.rt56.629.el6rt.noarch.rpm SHA-256: 6bc8ab158758329f4323fd2ebf3ec066a95d932c61abd87d8675c99ad1b71348
kernel-rt-firmware-3.10.0-693.39.1.rt56.629.el6rt.noarch.rpm SHA-256: 822ff4060b2c724270f37cc37c003c728eca390996f806be79d356541f223c7e
kernel-rt-trace-3.10.0-693.39.1.rt56.629.el6rt.x86_64.rpm SHA-256: 666b9e23fe20d7a8bf4dd1399642f91ff50a0646cd79b461fc26bcc50390a419
kernel-rt-trace-debuginfo-3.10.0-693.39.1.rt56.629.el6rt.x86_64.rpm SHA-256: e82cb236acf33f0d36632f3cd69d932212299ceef1ff6da18fa62eaa2caaadac
kernel-rt-trace-devel-3.10.0-693.39.1.rt56.629.el6rt.x86_64.rpm SHA-256: a3e26739b2b4131a73efcb2060488ef67d39c6a24e738f790813c742536ffd92
kernel-rt-vanilla-3.10.0-693.39.1.rt56.629.el6rt.x86_64.rpm SHA-256: af1b68503babebcba87cb722fc0767bb22283a39f43431f40fddc8f98b3b54e0
kernel-rt-vanilla-debuginfo-3.10.0-693.39.1.rt56.629.el6rt.x86_64.rpm SHA-256: edc228226c5b61cf2694db87cd36a5cc0c4f637c9260cc76340e304dab959c68
kernel-rt-vanilla-devel-3.10.0-693.39.1.rt56.629.el6rt.x86_64.rpm SHA-256: 7e92c5365f1002c662b3dddbe5f6634380c3b60da546580f985ef4f6e136e4d6

The Red Hat security contact is secalert@redhat.com. More contact details at https://access.redhat.com/security/team/contact/.

Red Hat

Quick Links

  • Downloads
  • Subscriptions
  • Support Cases
  • Customer Service
  • Product Documentation

Help

  • Contact Us
  • Customer Portal FAQ
  • Log-in Assistance

Site Info

  • Trust Red Hat
  • Browser Support Policy
  • Accessibility
  • Awards and Recognition
  • Colophon

Related Sites

  • redhat.com
  • developers.redhat.com
  • connect.redhat.com
  • cloud.redhat.com

About

  • Red Hat Subscription Value
  • About Red Hat
  • Red Hat Jobs
2023
  • Privacy Statement
  • Terms of Use
  • All Policies and Guidelines
We've updated our Privacy Statement effective September 15, 2023.
Red Hat Summit Red Hat Summit
Twitter