CVE-2011-1093

What it is

The dccp_rcv_state_process function in net/dccp/input.c in the Datagram Congestion Control Protocol (DCCP) implementation in the Linux kernel before 2.6.38 does not properly handle packets for a CLOSED endpoint, which allows remote attackers to cause a denial of service (NULL pointer dereference and OOPS) by sending a DCCP-Close packet followed by a DCCP-Reset packet.

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of service disruption.

Exploit odds

3.5% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2011-07-18 22:55 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-16 23:28 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 3.5% in the next 30 days (EPSS).
• Severity: 7.8 HIGH (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2011-07-18 22:55 UTC

Last modified

2026-06-16 23:28 UTC

Exploit probability

3.5% · EPSS, next 30 days

Weakness

CWE-476 · NULL pointer dereference

Record status

Modified

Affected

• Linux Kernel < 2.6.38
• Redhat Enterprise Linux Aus 5.6
• Redhat Enterprise Linux Desktop 5.0
• Redhat Enterprise Linux Eus 5.6
• Redhat Enterprise Linux Server 5.0
• Redhat Enterprise Linux Workstation 5.0

Attack profile CVSS 2.0 · 7.8

Attack vector

Network

Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Complete

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2011-1093.md and follow it. Check whether this project is affected by CVE-2011-1093. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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