Linux Kernel Netfilter nf_conntrack_irc.c nf_conntrack_irc communication channel to intended endpoints

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
6.2	$0-$5k	0.00

Summaryinfo

A vulnerability classified as critical has been found in Linux Kernel. This issue affects the function nf_conntrack_irc of the file net/netfilter/nf_conntrack_irc.c of the component Netfilter. Performing a manipulation results in communication channel to intended endpoints. This vulnerability is reported as CVE-2022-2663. The attack is possible to be carried out remotely. No exploit exists. Applying a patch is the recommended action to fix this issue.

Detailsinfo

A vulnerability was found in Linux Kernel (Operating System) (version now known). It has been classified as critical. This affects the function nf_conntrack_irc of the file net/netfilter/nf_conntrack_irc.c of the component Netfilter. The manipulation with an unknown input leads to a communication channel to intended endpoints vulnerability. CWE is classifying the issue as CWE-923. The product establishes a communication channel to (or from) an endpoint for privileged or protected operations, but it does not properly ensure that it is communicating with the correct endpoint. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

An issue was found in the Linux kernel in nf_conntrack_irc where the message handling can be confused and incorrectly matches the message. A firewall may be able to be bypassed when users are using unencrypted IRC with nf_conntrack_irc configured.

The weakness was disclosed 09/02/2022. The advisory is shared at openwall.com. This vulnerability is uniquely identified as CVE-2022-2663 since 08/04/2022. Technical details are known, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 236648 (Alibaba Cloud Linux 3 : 0002: cloud-kernel bugfix, enhancement and (ALINUX3-SA-2023:0002)), which helps to determine the existence of the flaw in a target environment.

Applying a patch is able to eliminate this problem. The bugfix is ready for download at lore.kernel.org.

The vulnerability is also documented in the databases at Tenable (236648) and EUVD (EUVD-2022-34909). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

Operating System

Vendor

Linux

Name

Kernel

License

open-source

Website

Vendor: https://www.kernel.org/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 6.2

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.3
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
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💳	💳	💳	💳	💳	💳
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Communication channel to intended endpoints
CWE: CWE-923
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 236648
Nessus Name: Alibaba Cloud Linux 3 : 0002: cloud-kernel bugfix, enhancement and (ALINUX3-SA-2023:0002)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Patch: lore.kernel.org

Timelineinfo

08/04/2022 🔍
09/02/2022 +29 days 🔍
09/02/2022 +0 days 🔍
05/26/2026 +1362 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: DLA 3131-1
Status: Confirmed

CVE: CVE-2022-2663 (🔍)
GCVE (CVE): GCVE-0-2022-2663
GCVE (VulDB): GCVE-100-207717
EUVD: 🔍

Entryinfo

Created: 09/02/2022 08:27
Updated: 05/26/2026 23:53
Changes: 09/02/2022 08:27 (41), 10/11/2022 08:58 (1), 10/11/2022 09:01 (11), 05/18/2025 21:05 (16), 05/26/2026 23:53 (1)
Complete: 🔍
Cache ID: 216::103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.