Skip to navigation Skip to main content

Utilities

  • Subscriptions
  • Downloads
  • Red Hat Console
  • Get Support
Red Hat Customer Portal
  • Subscriptions
  • Downloads
  • Red Hat Console
  • Get Support
  • Products

    Top Products

    • Red Hat Enterprise Linux
    • Red Hat OpenShift
    • Red Hat Ansible Automation Platform
    All Products

    Downloads and Containers

    • Downloads
    • Packages
    • Containers

    Top Resources

    • Documentation
    • Product Life Cycles
    • Product Compliance
    • Errata
  • Knowledge

    Red Hat Knowledge Center

    • Knowledgebase Solutions
    • Knowledgebase Articles
    • Customer Portal Labs
    • Errata

    Top Product Docs

    • Red Hat Enterprise Linux
    • Red Hat OpenShift
    • Red Hat Ansible Automation Platform
    All Product Docs

    Training and Certification

    • About
    • Course Index
    • Certification Index
    • Skill Assessment
  • Security

    Red Hat Product Security Center

    • Security Updates
    • Security Advisories
    • Red Hat CVE Database
    • Errata

    References

    • Security Bulletins
    • Security Measurement
    • Severity Ratings
    • Security Data

    Top Resources

    • Security Labs
    • Backporting Policies
    • Security Blog
  • Support

    Red Hat Support

    • Support Cases
    • Troubleshoot
    • Get Support
    • Contact Red Hat Support

    Red Hat Community Support

    • Customer Portal Community
    • Community Discussions
    • Red Hat Accelerator Program

    Top Resources

    • Product Life Cycles
    • Customer Portal Labs
    • Red Hat JBoss Supported Configurations
    • Red Hat Insights
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
  • Red Hat OpenShift AI
  • Red Hat OpenShift Dedicated
  • Red Hat Advanced Cluster Security for Kubernetes
  • Red Hat Advanced Cluster Management for Kubernetes
  • Red Hat Quay
  • Red Hat 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 build of Keycloak
  • 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-2021:2726 - Security Advisory
Issued:
2021-07-20
Updated:
2021-07-20

RHSA-2021:2726 - 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 Linux 7.

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):

  • kernel: size_t-to-int conversion vulnerability in the filesystem layer (CVE-2021-33909)
  • kernel: use-after-free in net/bluetooth/hci_event.c when destroying an hci_chan (CVE-2021-33034)
  • kernel: use-after-free in show_numa_stats function (CVE-2019-20934)
  • kernel: mishandles invalid descriptors in drivers/media/usb/gspca/xirlink_cit.c (CVE-2020-11668)
  • kernel: use-after-free in cipso_v4_genopt in net/ipv4/cipso_ipv4.c (CVE-2021-33033)

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):

  • kernel-rt: update to the latest RHEL7.9.z7 source tree (BZ#1967333)

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

  • Red Hat Enterprise Linux for Real Time 7 x86_64
  • Red Hat Enterprise Linux for Real Time for NFV 7 x86_64

Fixes

  • BZ - 1824792 - CVE-2020-11668 kernel: mishandles invalid descriptors in drivers/media/usb/gspca/xirlink_cit.c
  • BZ - 1902788 - CVE-2019-20934 kernel: use-after-free in show_numa_stats function
  • BZ - 1961300 - CVE-2021-33033 kernel: use-after-free in cipso_v4_genopt in net/ipv4/cipso_ipv4.c
  • BZ - 1961305 - CVE-2021-33034 kernel: use-after-free in net/bluetooth/hci_event.c when destroying an hci_chan
  • BZ - 1970273 - CVE-2021-33909 kernel: size_t-to-int conversion vulnerability in the filesystem layer

CVEs

  • CVE-2019-20934
  • CVE-2020-11668
  • CVE-2021-33033
  • CVE-2021-33034
  • CVE-2021-33909

References

  • https://access.redhat.com/security/updates/classification/#important
  • https://access.redhat.com/security/vulnerabilities/RHSB-2021-006
Note: More recent versions of these packages may be available. Click a package name for more details.

Red Hat Enterprise Linux for Real Time 7

SRPM
kernel-rt-3.10.0-1160.36.2.rt56.1179.el7.src.rpm SHA-256: 9afa7ae564a1134086b35868fd11a70c8ef28599a1c30e8f309309ae04fb496a
x86_64
kernel-rt-3.10.0-1160.36.2.rt56.1179.el7.x86_64.rpm SHA-256: 9ffb8097cfb8b43a65280240e7fa85e8dc305d3abee4f6212c152787b85111f3
kernel-rt-debug-3.10.0-1160.36.2.rt56.1179.el7.x86_64.rpm SHA-256: ecc3ddaa80530769b681f0094d36e734370625361db14d090d43de6cfa706c16
kernel-rt-debug-debuginfo-3.10.0-1160.36.2.rt56.1179.el7.x86_64.rpm SHA-256: 8d459408d3b0717a5ec5fcdcff532c9819071719465d514daf31e52dfe08cabf
kernel-rt-debug-devel-3.10.0-1160.36.2.rt56.1179.el7.x86_64.rpm SHA-256: c9a1fac85c4c175d8b8caffef951902c48166c6cd492d86f18ec4d2740188b37
kernel-rt-debuginfo-3.10.0-1160.36.2.rt56.1179.el7.x86_64.rpm SHA-256: d06495bb82f488458e5d14e2cbaa5efb116d3c4aedf141be1862b28bf9b63a8c
kernel-rt-debuginfo-common-x86_64-3.10.0-1160.36.2.rt56.1179.el7.x86_64.rpm SHA-256: e0d9eb5391ee66bf0fe9424d536f7ec826dbc906aed4565781c48426fda7b074
kernel-rt-devel-3.10.0-1160.36.2.rt56.1179.el7.x86_64.rpm SHA-256: 4cf4692c5b3105c38c94510bd567752736bf974e3da6e72347d04871a41d69e1
kernel-rt-doc-3.10.0-1160.36.2.rt56.1179.el7.noarch.rpm SHA-256: 30f1b73bce5956cdc0668fd841bf59d6cedd835dd1787b497a7e63c93d5867fc
kernel-rt-trace-3.10.0-1160.36.2.rt56.1179.el7.x86_64.rpm SHA-256: 670c776bac9a03c512eb36ba30750aa5fa7e7770556e9ca0d077f74e8fa55766
kernel-rt-trace-debuginfo-3.10.0-1160.36.2.rt56.1179.el7.x86_64.rpm SHA-256: 374f4c5c3b9dbbfed553e436ae4362ce4912ce7e9c355bf22d30319f3f56bede
kernel-rt-trace-devel-3.10.0-1160.36.2.rt56.1179.el7.x86_64.rpm SHA-256: 1c70d5fb5ccc743ed78d67ba066067c460389f86a210eadacee2489b30b33d4e

Red Hat Enterprise Linux for Real Time for NFV 7

SRPM
kernel-rt-3.10.0-1160.36.2.rt56.1179.el7.src.rpm SHA-256: 9afa7ae564a1134086b35868fd11a70c8ef28599a1c30e8f309309ae04fb496a
x86_64
kernel-rt-3.10.0-1160.36.2.rt56.1179.el7.x86_64.rpm SHA-256: 9ffb8097cfb8b43a65280240e7fa85e8dc305d3abee4f6212c152787b85111f3
kernel-rt-debug-3.10.0-1160.36.2.rt56.1179.el7.x86_64.rpm SHA-256: ecc3ddaa80530769b681f0094d36e734370625361db14d090d43de6cfa706c16
kernel-rt-debug-debuginfo-3.10.0-1160.36.2.rt56.1179.el7.x86_64.rpm SHA-256: 8d459408d3b0717a5ec5fcdcff532c9819071719465d514daf31e52dfe08cabf
kernel-rt-debug-devel-3.10.0-1160.36.2.rt56.1179.el7.x86_64.rpm SHA-256: c9a1fac85c4c175d8b8caffef951902c48166c6cd492d86f18ec4d2740188b37
kernel-rt-debug-kvm-3.10.0-1160.36.2.rt56.1179.el7.x86_64.rpm SHA-256: f99025d3bbe61ec17981f619aaccba1a9612f9c261c6212ea6e030f0073dbd6f
kernel-rt-debug-kvm-debuginfo-3.10.0-1160.36.2.rt56.1179.el7.x86_64.rpm SHA-256: cc1c27bd06d39dc35ed48f15d020cf4f1eb07aec917cb78c4d870ddcc623516f
kernel-rt-debuginfo-3.10.0-1160.36.2.rt56.1179.el7.x86_64.rpm SHA-256: d06495bb82f488458e5d14e2cbaa5efb116d3c4aedf141be1862b28bf9b63a8c
kernel-rt-debuginfo-common-x86_64-3.10.0-1160.36.2.rt56.1179.el7.x86_64.rpm SHA-256: e0d9eb5391ee66bf0fe9424d536f7ec826dbc906aed4565781c48426fda7b074
kernel-rt-devel-3.10.0-1160.36.2.rt56.1179.el7.x86_64.rpm SHA-256: 4cf4692c5b3105c38c94510bd567752736bf974e3da6e72347d04871a41d69e1
kernel-rt-doc-3.10.0-1160.36.2.rt56.1179.el7.noarch.rpm SHA-256: 30f1b73bce5956cdc0668fd841bf59d6cedd835dd1787b497a7e63c93d5867fc
kernel-rt-kvm-3.10.0-1160.36.2.rt56.1179.el7.x86_64.rpm SHA-256: 34e4a9caed770232b5974fbb0a507e0b844e0faa7bba48ae2a6645af0192880b
kernel-rt-kvm-debuginfo-3.10.0-1160.36.2.rt56.1179.el7.x86_64.rpm SHA-256: 47b6eaba64aa38b67eb40469683332741c70a6bd77bbf6ea1a6c9cd148de6308
kernel-rt-trace-3.10.0-1160.36.2.rt56.1179.el7.x86_64.rpm SHA-256: 670c776bac9a03c512eb36ba30750aa5fa7e7770556e9ca0d077f74e8fa55766
kernel-rt-trace-debuginfo-3.10.0-1160.36.2.rt56.1179.el7.x86_64.rpm SHA-256: 374f4c5c3b9dbbfed553e436ae4362ce4912ce7e9c355bf22d30319f3f56bede
kernel-rt-trace-devel-3.10.0-1160.36.2.rt56.1179.el7.x86_64.rpm SHA-256: 1c70d5fb5ccc743ed78d67ba066067c460389f86a210eadacee2489b30b33d4e
kernel-rt-trace-kvm-3.10.0-1160.36.2.rt56.1179.el7.x86_64.rpm SHA-256: 308921a6e3ced47314dce7a7606ab08fcd799e07442efaa2a3016d484acf88fb
kernel-rt-trace-kvm-debuginfo-3.10.0-1160.36.2.rt56.1179.el7.x86_64.rpm SHA-256: 2a9137f55004f23b7c2d7f774d0e8aa3faf0e993acb26fe86ec28154717019bb

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

Red Hat X (formerly Twitter)

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

Red Hat legal and privacy links

  • About Red Hat
  • Jobs
  • Events
  • Locations
  • Contact Red Hat
  • Red Hat Blog
  • Inclusion at Red Hat
  • Cool Stuff Store
  • Red Hat Summit
© 2025 Red Hat, Inc.

Red Hat legal and privacy links

  • Privacy statement
  • Terms of use
  • All policies and guidelines
  • Digital accessibility