MTU Regression in xfrm

Kernel Updated 02 Oct 2025

Summary

18/03/2022

Disclosed on

N/A

Severity

No i

Fix available

Unrated

Severity

Not published

CVSS Score

GSD-2022-1000941: xfrm: fix MTU regression. Affects Kernel versions >= fb50d8c9169ee0e90cd7a733d65cb86876d795c7, < 80080bbcb25d386add6482aea9969e89834a8678. No fix is published. How to fix ↓

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Background

The xfrm package is a component of the Linux Kernel that provides IPsec (Internet Protocol Security) functionality. It is responsible for handling the transformation of packets between different network layers. The package is widely used in Linux-based systems to secure network communications. However, a vulnerability has been discovered in the xfrm package that can lead to a regression in the Maximum Transmission Unit (MTU) handling.

Vulnerability Detail

The MTU regression vulnerability in xfrm can result in network connectivity issues and degraded performance. It was introduced in Linux Kernel version v4.9.79 and fixed in v4.9.305. The vulnerability arises from a specific commit (fb50d8c9169ee0e90cd7a733d65cb86876d795c7) that caused the regression. Attackers may exploit this vulnerability to disrupt network communications or launch denial-of-service attacks. The impact and attack plausibility of this vulnerability have not been proven yet.

How To Fix

No fixed version is published for this vulnerability.

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Workaround

No specific workaround has been provided for this vulnerability.

Conclusion

The MTU regression vulnerability in xfrm can have significant implications for network connectivity and performance. It is crucial to update the Linux Kernel to the fixed version to mitigate the risk. For further assistance and support in vulnerability remediation, please contact DevNack.com.

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