net/sched: fq_pie: prevent dismantle issue in Kernel
Summary
GSD-2021-1002594: net/sched: fq_pie: prevent dismantle issue. Affects Kernel versions >= ec97ecf1ebe485a17cd8395a5f35e6b80b57665a, < d86216dfda7c98375f809e26a30bfdaaba21d46e. No fix is published. How to fix ↓
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Background
The Kernel is a fundamental component of the Linux operating system that provides core functionalities and manages system resources. It acts as an interface between the hardware and software layers, facilitating communication and coordination between various components. The fq_pie module in the Kernel is responsible for implementing the Fair Queuing with Proportional Integral controller Enhanced (fq_pie) algorithm, which is used for network packet scheduling. This algorithm aims to improve network performance and fairness by dynamically adjusting packet transmission rates based on network conditions. However, a vulnerability has been identified in the fq_pie module that could lead to a dismantle issue.
Vulnerability Detail
The identified vulnerability in the fq_pie module of the Kernel can potentially result in a dismantle issue. This issue arises due to a flaw introduced in version v5.6 of the Linux Kernel by commit ec97ecf1ebe485a17cd8395a5f35e6b80b57665a. The exact impact and attack plausibility of this vulnerability have not been proven yet. However, if exploited, it could potentially lead to network instability, performance degradation, or even denial-of-service conditions. The vulnerability has been addressed in Linux Kernel version v5.15.8 by commit d86216dfda7c98375f809e26a30bfdaaba21d46e.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a workaround, if updating the Kernel is not immediately feasible, users can disable or unload the fq_pie module to mitigate the vulnerability. This can be achieved by executing the following commands as root:
modprobe -r fq_pie
Conclusion
In conclusion, the fq_pie module in the Kernel is vulnerable to a dismantle issue, which could potentially result in network instability or denial-of-service conditions. It is crucial to update the Linux Kernel to version v5.15.8 or later to mitigate this vulnerability. Alternatively, users can apply the provided workaround by disabling or unloading the fq_pie module. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The fq_pie module in the Kernel implements the Fair Queuing with Proportional Integral controller Enhanced (fq_pie) algorithm for network packet scheduling. It aims to improve network performance and fairness by dynamically adjusting packet transmission rates based on network conditions.
The impact of the dismantle issue is not yet proven, but it could potentially lead to network instability, performance degradation, or denial-of-service conditions if exploited.
The vulnerability was introduced in version v5.6 of the Linux Kernel and is present in all subsequent versions until v5.15.7. It has been fixed in version v5.15.8.
To update the Linux Kernel, you can follow the official update process provided by your Linux distribution. Alternatively, you can manually compile and install the updated Kernel source code.
Yes, as a temporary workaround, you can disable or unload the fq_pie module by executing the command 'modprobe -r fq_pie' as root.
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