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
  • 한국어
  • 日本語
  • 中文 (中国)

Infrastructure and Management

  • Red Hat Enterprise Linux
  • Red Hat Virtualization
  • Red Hat Identity Management
  • Red Hat Directory Server
  • Red Hat Certificate System
  • Red Hat Satellite
  • Red Hat Subscription Management
  • Red Hat Update Infrastructure
  • Red Hat Insights
  • Red Hat Ansible Automation Platform

Cloud Computing

  • Red Hat OpenShift
  • Red Hat CloudForms
  • Red Hat OpenStack Platform
  • Red Hat OpenShift Container Platform
  • Red Hat OpenShift Data Science
  • Red Hat OpenShift Online
  • Red Hat OpenShift Dedicated
  • Red Hat Advanced Cluster Security for Kubernetes
  • Red Hat Advanced Cluster Management for Kubernetes
  • Red Hat Quay
  • Red Hat CodeReady Workspaces
  • 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 Thorntail
  • Red Hat build of Eclipse Vert.x
  • Red Hat build of OpenJDK
  • Red Hat build of Quarkus

Integration and Automation

  • Red Hat Integration
  • Red Hat Fuse
  • Red Hat AMQ
  • Red Hat 3scale API Management
  • Red Hat JBoss Data Virtualization
  • Red Hat Process Automation
  • Red Hat Process Automation Manager
  • Red Hat Decision Manager
All Products
Red Hat Product Errata RHSA-2019:1487 - Security Advisory
Issued:
2019-06-17
Updated:
2019-06-17

RHSA-2019:1487 - 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):

  • An integer overflow flaw was found in the way the Linux kernel's networking subsystem processed TCP Selective Acknowledgment (SACK) segments. While processing SACK segments, the Linux kernel's socket buffer (SKB) data structure becomes fragmented. Each fragment is about TCP maximum segment size (MSS) bytes. To efficiently process SACK blocks, the Linux kernel merges multiple fragmented SKBs into one, potentially overflowing the variable holding the number of segments. A remote attacker could use this flaw to crash the Linux kernel by sending a crafted sequence of SACK segments on a TCP connection with small value of TCP MSS, resulting in a denial of service (DoS). (CVE-2019-11477)
  • kernel: race condition in snd_seq_write() may lead to UAF or OOB-access (CVE-2018-7566)
  • kernel: Race condition in sound system can lead to denial of service (CVE-2018-1000004)
  • Kernel: tcp: excessive resource consumption while processing SACK blocks allows remote denial of service (CVE-2019-11478)
  • Kernel: tcp: excessive resource consumption for TCP connections with low MSS allows remote denial of service (CVE-2019-11479)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Bug Fix(es):

  • update the MRG 2.5.z 3.10 kernel-rt sources (BZ#1711010)

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 - 1535315 - CVE-2018-1000004 kernel: Race condition in sound system can lead to denial of service
  • BZ - 1550142 - CVE-2018-7566 kernel: race condition in snd_seq_write() may lead to UAF or OOB-access
  • BZ - 1711010 - update the MRG 2.5.z 3.10 kernel-rt sources
  • BZ - 1719123 - CVE-2019-11477 Kernel: tcp: integer overflow while processing SACK blocks allows remote denial of service
  • BZ - 1719128 - CVE-2019-11478 Kernel: tcp: excessive resource consumption while processing SACK blocks allows remote denial of service
  • BZ - 1719129 - CVE-2019-11479 Kernel: tcp: excessive resource consumption for TCP connections with low MSS allows remote denial of service

CVEs

  • CVE-2018-7566
  • CVE-2018-1000004
  • CVE-2019-11477
  • CVE-2019-11478
  • CVE-2019-11479

References

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

MRG Realtime 2

SRPM
kernel-rt-3.10.0-693.50.3.rt56.644.el6rt.src.rpm SHA-256: e87e6aa7c4732ca2501bc6979f2e5b30e7a96530692abc4b170d649ae0d42391
x86_64
kernel-rt-3.10.0-693.50.3.rt56.644.el6rt.x86_64.rpm SHA-256: 4f43d2a30f80516770649546e3f9368b4c191993b3925d24969affb94a0f46e4
kernel-rt-debug-3.10.0-693.50.3.rt56.644.el6rt.x86_64.rpm SHA-256: 31bcb87185fd8ef3abfb2725ac9c34d37c2545a84c130fe97d6039a5a141d61e
kernel-rt-debug-debuginfo-3.10.0-693.50.3.rt56.644.el6rt.x86_64.rpm SHA-256: e18a857631cc119210576197235b362ca331eadf5cc3588e7a62bb9329f87e0c
kernel-rt-debug-devel-3.10.0-693.50.3.rt56.644.el6rt.x86_64.rpm SHA-256: c6ac04f53dab14bccbf14e90eff8bca29e2f160aa843099def32671a30dd9792
kernel-rt-debuginfo-3.10.0-693.50.3.rt56.644.el6rt.x86_64.rpm SHA-256: 5874380d8f5d2f83a15fd4a88653853f96d51240facc76a27465e5d5f9b64832
kernel-rt-debuginfo-common-x86_64-3.10.0-693.50.3.rt56.644.el6rt.x86_64.rpm SHA-256: 4da04edc2298c01ee019efc8c0f180ed4537052410c14b7c68f3aae085cdc2e0
kernel-rt-devel-3.10.0-693.50.3.rt56.644.el6rt.x86_64.rpm SHA-256: 49d319ac98c0c514b3c00219f68fc7c05eccfc976cce83eb221b80eabe6279da
kernel-rt-doc-3.10.0-693.50.3.rt56.644.el6rt.noarch.rpm SHA-256: 7b16afd630c94d4cd8e31d259f9fd265479136d27e748fa0d8e43775e6124ae8
kernel-rt-firmware-3.10.0-693.50.3.rt56.644.el6rt.noarch.rpm SHA-256: a059b05a6178ed62ad74393d0df9d37ef0cc8c8e43e3bb7ab351adc11377b93c
kernel-rt-trace-3.10.0-693.50.3.rt56.644.el6rt.x86_64.rpm SHA-256: b4de0898ef17e94809ca68e66479574bd04afb9e83eb6346685a3b6f7c7c5043
kernel-rt-trace-debuginfo-3.10.0-693.50.3.rt56.644.el6rt.x86_64.rpm SHA-256: 74cee7cd40415db3c063b4b0842877489c6830bc49a8620ffe4ad1deba17c2b1
kernel-rt-trace-devel-3.10.0-693.50.3.rt56.644.el6rt.x86_64.rpm SHA-256: 4d91f489bd7315209e7ce80ed285ed77321a702c77f96eac925dbd478062ff89
kernel-rt-vanilla-3.10.0-693.50.3.rt56.644.el6rt.x86_64.rpm SHA-256: b1e45295dfe1510a67430c28ee02c3edba8f5fde076f1c4932b828e5c1732e25
kernel-rt-vanilla-debuginfo-3.10.0-693.50.3.rt56.644.el6rt.x86_64.rpm SHA-256: 4e72f59c2b3d4d223a64e4f3be4bb9ec1cd8f732ddd3e85feff28806ff73ccd5
kernel-rt-vanilla-devel-3.10.0-693.50.3.rt56.644.el6rt.x86_64.rpm SHA-256: 4b28d414ba81a4c3619c0f7ea45fc3ebf9641dd4df14a02f8c2b854178583e2d

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
Copyright © 2022 Red Hat, Inc.
  • Privacy Statement
  • Customer Portal Terms of Use
  • All Policies and Guidelines
Red Hat Summit
Twitter