CVE-2009-1243

Name: CVE-2009-1243
Creator: NVD / NIST
Published: 2009-04-06T14:30:00.407+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.5/10EPSS 0.27%

Last modified Jun 16, 2026

CVE-2009-1243 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. net/ipv4/udp.c in the Linux kernel before 2.6.29.1 performs an unlocking step in certain incorrect circumstances, which allows local users to cause a denial of service (panic) by reading zero bytes from the /proc/net/udp file and unspecified other files, related to the "udp seq_file infrastructure.". EPSS estimates a 0.27% chance of exploitation in the next 30 days.

Description

net/ipv4/udp.c in the Linux kernel before 2.6.29.1 performs an unlocking step in certain incorrect circumstances, which allows local users to cause a denial of service (panic) by reading zero bytes from the /proc/net/udp file and unspecified other files, related to the "udp seq_file infrastructure."

Metrics

CVSS 3.1

5.5/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

0.27%

18.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-667

Affected Software

Vendor	Product	Versions
Linux	Linux Kernel	< 2.6.29.1

References

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=30842f2989aacfaba3ccb39829b3417be9313dbeBroken Link
http://openwall.com/lists/oss-security/2009/04/01/4Mailing List, Patch, Third Party Advisory
http://secunia.com/advisories/34478Broken Link, Third Party Advisory
http://vigilance.fr/vulnerability/Linux-kernel-denial-of-service-via-proc-net-udp-8586Patch, Third Party Advisory
http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.29.1Broken Link
http://www.securityfocus.com/bid/34329Broken Link, Patch, Third Party Advisory, VDB Entry
http://www.vupen.com/english/advisories/2009/0924Broken Link, Third Party Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/49595Third Party Advisory, VDB Entry
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=30842f2989aacfaba3ccb39829b3417be9313dbeBroken Link
http://openwall.com/lists/oss-security/2009/04/01/4Mailing List, Patch, Third Party Advisory
http://secunia.com/advisories/34478Broken Link, Third Party Advisory
http://vigilance.fr/vulnerability/Linux-kernel-denial-of-service-via-proc-net-udp-8586Patch, Third Party Advisory
http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.29.1Broken Link
http://www.securityfocus.com/bid/34329Broken Link, Patch, Third Party Advisory, VDB Entry
http://www.vupen.com/english/advisories/2009/0924Broken Link, Third Party Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/49595Third Party Advisory, VDB Entry

Timeline

Published: Apr 6, 2009
Last Modified: Jun 16, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2009-1243?

How severe is CVE-2009-1243?

CVE-2009-1243 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 0.27% probability of exploitation in the next 30 days.

How do I fix CVE-2009-1243?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2009-1243?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST