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-2010:0041 - Security Advisory
Issued:
2010-01-21
Updated:
2010-01-21

RHSA-2010:0041 - Security Advisory

  • Overview

Synopsis

Important: kernel-rt security and bug fix update

Type/Severity

Security Advisory: Important

Topic

Updated kernel-rt packages that fix multiple security issues and several
bugs are now available for Red Hat Enterprise MRG 1.2.

This update has been rated as having important security impact by the Red
Hat Security Response Team.

Description

The kernel-rt packages contain the Linux kernel, the core of any Linux
operating system.

This update fixes the following security issues:

  • an array index error was found in the gdth driver in the Linux kernel. A

local user could send a specially-crafted IOCTL request that would cause a
denial of service or, possibly, privilege escalation. (CVE-2009-3080,
Important)

  • a flaw was found in the FUSE implementation in the Linux kernel. When a

system is low on memory, fuse_put_request() could dereference an invalid
pointer, possibly leading to a local denial of service or privilege
escalation. (CVE-2009-4021, Important)

  • a flaw was found in each of the following Intel PRO/1000 Linux drivers in

the Linux kernel: e1000 and e1000e. A remote attacker using packets larger
than the MTU could bypass the existing fragment check, resulting in
partial, invalid frames being passed to the network stack. These flaws
could also possibly be used to trigger a remote denial of service.
(CVE-2009-4536, CVE-2009-4538, Important)

  • a flaw was found in the Realtek r8169 Ethernet driver in the Linux

kernel. Receiving overly-long frames with a certain revision of the network
cards supported by this driver could possibly result in a remote denial of
service. (CVE-2009-4537, Important)

This update also fixes the following bugs:

  • the "function tracer" from ftrace could eventually present problems when

a module was unloaded during a tracing session. Some of the related call
site entries for that module were not removed from ftrace's internal lists
and could lead to confusing "oops" error messages. The call site entries
are now removed correctly, and the errors no longer occur. (BZ#537472)

  • when using the kernel in tickless (or NOHZ) mode, time was not

accumulated one tick at a time. This created latencies when the accumulated
interval grew large. Time is now accumulated logarithmically and latencies
related to tickless mode no longer occur. (BZ#538370)

  • running the "cset set" command was resulting in unsafe access to a

structure that could be concurrently changed. This was eventually causing
the kernel to crash. The operations were repositioned so that they no
longer add locks, to minimize performance penalties. (BZ#541080)

  • the function used to calculate system load called different functions to

count the tasks in running and interpretable states. On systems with a
large number of CPUs, this could result in several TLB and cache misses.
These functions have now been combined, and the problem has been
significantly reduced. (BZ#552860)

  • when legacy PCI bus checks occurred, an off-by-one error would present.

Scanning 255 PCI buses is now allowed as 0xff is a valid bus, and the error
no longer occurs. (BZ#552874)

  • on systems with 8 or more CPUs, an unnecessary anon_vma lock acquisition

in vma_adjust() was causing a decrease in throughput. Code from the
upstream kernel was backported, and the throughput decrease no longer
exists. (BZ#552876)

  • the scheduler function double_lock_balance() favors logically lower CPUs.

This could cause logically higher CPUs to be starved if run queues were
under a lot of pressure, resulting in latencies. The algorithm has been
adjusted so that it is fairer, and logically higher CPUs no longer risk
being starved. (BZ#552877)

These updated packages also include other bug fixes. Users are directed to
the Red Hat Enterprise MRG 1.2 Release Notes for information on those
fixes, available shortly from:

http://www.redhat.com/docs/en-US/Red_Hat_Enterprise_MRG/

Users should upgrade to these updated packages, which contain backported
patches to correct these issues. The system must be rebooted for this
update to take effect.

Solution

Before applying this update, make sure that all previously-released
errata relevant to your system have been applied.

This update is available via Red Hat Network. Details on how to use
the Red Hat Network to apply this update are available at
http://kbase.redhat.com/faq/docs/DOC-11259

Affected Products

  • MRG Realtime 1 x86_64
  • MRG Realtime 1 i386

Fixes

  • BZ - 537472 - ftrace function tracer triggers integrity check failure
  • BZ - 538734 - CVE-2009-4021 kernel: fuse: prevent fuse_put_request on invalid pointer
  • BZ - 539414 - CVE-2009-3080 kernel: gdth: Prevent negative offsets in ioctl
  • BZ - 541080 - MRG Kernel crashes when we run "cset set" command, but the crash is random.
  • BZ - 550907 - CVE-2009-4537 kernel: r8169 issue reported at 26c3
  • BZ - 551214 - CVE-2009-4538 kernel: e1000e frame fragment issue
  • BZ - 552126 - CVE-2009-4536 kernel: e1000 issue reported at 26c3

CVEs

  • CVE-2009-4021
  • CVE-2009-3080
  • CVE-2009-4538
  • CVE-2009-4537
  • CVE-2009-4536

References

  • http://www.redhat.com/security/updates/classification/#important
  • http://www.redhat.com/docs/en-US/Red_Hat_Enterprise_MRG/

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

Red Hat LinkedIn YouTube Facebook 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

Red Hat legal and privacy links

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