Vulnerability in Kernel Package: ip_gre: test csum_start instead of transport header

Kernel Updated 02 Oct 2025

Summary

28/06/2022

Disclosed on

N/A

Severity

No i

Fix available

Unrated

Severity

Not published

CVSS Score

GSD-2022-1002589: ip_gre: test csum_start instead of transport header. Affects Kernel versions >= 8a0ed250f911da31a2aef52101bc707846a800ff, < 0ffa268724656633af5f37a38c212326d98ebe8c. No fix is published. How to fix ↓

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Background

The Kernel package is an integral part of the Linux operating system, responsible for managing the core functionalities and interactions between hardware and software components. It provides essential services such as memory management, process scheduling, and device drivers. The ip_gre module within the Kernel package enables the encapsulation and transmission of IP packets over Generic Routing Encapsulation (GRE) tunnels. This vulnerability specifically affects the ip_gre module and involves an incorrect verification of the csum_start field instead of the transport header. This vulnerability could potentially be exploited by malicious actors to manipulate network traffic and compromise the integrity of data being transmitted.

Vulnerability Detail

The vulnerability arises from a flaw in the ip_gre module's verification process. Instead of properly checking the transport header, the module erroneously examines the csum_start field. This oversight could allow an attacker to bypass certain security measures and tamper with the encapsulated IP packets. The impact of this vulnerability could range from data corruption to unauthorized access or injection of malicious content. It is important to note that the actual exploitability and severity of the vulnerability have not been conclusively proven.

How To Fix

No fixed version is published for this vulnerability.

To address this vulnerability, it is recommended to update the Linux Kernel package to version v5.18.4 or later. The fix for this issue was implemented in commit 0ffa268724656633af5f37a38c212326d98ebe8c. Updating to the latest version ensures that the ip_gre module correctly verifies the transport header, mitigating the vulnerability.

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Workaround

As a temporary workaround, users can disable the ip_gre module if it is not essential for their system's functionality. This can be achieved by executing the following command as root:

modprobe -r ip_gre

Conclusion

In conclusion, the Kernel package's ip_gre module is susceptible to a vulnerability that could potentially compromise the integrity of transmitted data. It is crucial to update the package to the recommended version or apply the provided workaround to mitigate the risk. For further assistance or support in addressing this vulnerability, please contact DevNack.com.

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