CVE-2009-1243
5.5 · MEDIUMOverview
CVE-2009-1243 is a medium-severity vulnerability affecting linux linux_kernel. It was published on April 6, 2009 and has a CVSS 3.1 base score of 5.5 (MEDIUM).
This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.
Technical 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."
Remediation
Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| linux | linux_kernel | >= 0, < 2.6.29.1 | Affected |
References
Frequently Asked Questions
What is CVE-2009-1243?
CVE-2009-1243 is a medium-severity vulnerability affecting linux linux_kernel. It was published on April 6, 2009 and has a CVSS 3.1 base score of 5.5 (MEDIUM).
How severe is CVE-2009-1243?
This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.
How do I fix or remediate CVE-2009-1243?
Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2009-1243?
CyberStrike's AI-powered security agents can automatically detect CVE-2009-1243 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
Automated penetration testing that runs continuously, not just quarterly.
AI-driven PR review catches vulnerable dependencies before they ship.
Browser-based exploitation validates findings with real proof-of-concept.
Related MEDIUM CVEs from 2009
View all →Ignite Realtime Openfire before 3.6.5 does not properly implement the register.password (aka canChan
The default configuration of the Security global settings on the Citrix NetScaler Access Gateway app
The Active Template Library (ATL) in Microsoft Visual Studio .NET 2003 SP1, Visual Studio 2005 SP1 a
Multiple use-after-free vulnerabilities in libxml2 2.5.10, 2.6.16, 2.6.26, 2.6.27, and 2.6.32, and l
Cross-site request forgery (CSRF) vulnerability in bingo!CMS 1.2 and earlier allows remote attackers
Multiple directory traversal vulnerabilities in Home FTP Server 1.10.1.139 allow remote authenticate
Directory traversal vulnerability in MyBB (aka MyBulletinBoard) 1.4.10, and possibly earlier version
Cross-site scripting (XSS) vulnerability in CMD_REDIRECT in DirectAdmin 1.33.6 and earlier allows re
Mozilla Network Security Services (NSS) before 3.12.3, Firefox before 3.0.13, Thunderbird before 2.0
Cisco IOS XR 3.4.0 through 3.8.1 allows remote attackers to cause a denial of service (session reset
XTerm in Apple Mac OS X 10.4.11 and 10.5.6, when used with luit, creates tty devices with insecure w
The inotify_read function in the Linux kernel 2.6.27 to 2.6.27.13, 2.6.28 to 2.6.28.2, and 2.6.29-rc