high
7.8
CWE
20 667
Advisory Published
CVE Published
Updated

CVE-2009-4272: Input Validation

First published: Tue Dec 08 2009(Updated: )

A certain Red Hat patch for net/ipv4/route.c in the Linux kernel 2.6.18 on Red Hat Enterprise Linux (RHEL) 5 allows remote attackers to cause a denial of service (deadlock) via crafted packets that force collisions in the IPv4 routing hash table, and trigger a routing "emergency" in which a hash chain is too long. NOTE: this is related to an issue in the Linux kernel before 2.6.31, when the kernel routing cache is disabled, involving an uninitialized pointer and a panic.

Credit: secalert@redhat.com

Affected SoftwareAffected VersionHow to fix
Linux kernel=2.6.18
Red Hat Enterprise Linux=5
All of
Linux Kernel=2.6.18
Red Hat Enterprise Linux=5.0
Red Hat Enterprise Virtualization=5.0
Red Hat Enterprise Linux Desktop=5.0
Red Hat Enterprise Linux Server EUS=5.4
Red Hat Enterprise Linux Server=5.0
Red Hat Enterprise Linux Workstation=5.0

Never miss a vulnerability like this again

Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.

Read MoreStart Free Trial

Reference Links

Frequently Asked Questions

  • What is the severity of CVE-2009-4272?

    CVE-2009-4272 has been classified as a high-severity vulnerability due to its potential to cause denial of service in affected systems.

  • How do I fix CVE-2009-4272?

    To fix CVE-2009-4272, apply the relevant security patches provided by Red Hat for your version of the Linux kernel.

  • Which systems are affected by CVE-2009-4272?

    CVE-2009-4272 affects Red Hat Enterprise Linux 5.0 and systems running the Linux kernel version 2.6.18.

  • What type of attack does CVE-2009-4272 enable?

    CVE-2009-4272 allows remote attackers to execute a denial of service attack by sending specially crafted packets.

  • Is CVE-2009-4272 exploitable from remote locations?

    Yes, CVE-2009-4272 can be exploited by remote attackers to cause a deadlock in the system's routing functionality.

Company

Resources

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co
By using SecAlerts services, you agree to our services end-user license agreement. This website is safeguarded by reCAPTCHA and governed by the Google Privacy Policy and Terms of Service. All names, logos, and brands of products are owned by their respective owners, and any usage of these names, logos, and brands for identification purposes only does not imply endorsement. If you possess any content that requires removal, please get in touch with us.
© 2025 SecAlerts Pty Ltd.
ABN: 70 645 966 203, ACN: 645 966 203