CVE-2009-1243 Race condition in n/a

What is CVE-2009-1243?

CVE-2009-1243 is a medium-severity vulnerability in Linux kernel, published on 6 Apr 2009. It can only be exploited from the same machine or local network, with no action from the victim.

Official 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."

Weakness: CWE-667

Which versions are affected by CVE-2009-1243?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2009-1243?

No fix has been published for CVE-2009-1243 yet. Limit exposure of the affected software until one is available.

Is CVE-2009-1243 being exploited?

There is no known exploitation of CVE-2009-1243 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-p5fc-ww5c-rrv7.