net/sched: act_skbmod: Skip non-Ethernet packets
Summary
GSD-2021-1001166: net/sched: act_skbmod: Skip non-Ethernet packets. Affects Kernel versions >= 86da71b57383d40993cb90baafb3735cffe5d800, < 34f1e1f657fae2891b485a3b2b95fe4d2aef9f0d. No fix is published. How to fix ↓
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Background
The Linux Kernel is a widely used open-source operating system kernel that serves as the foundation for various Linux distributions. It provides essential functionality for managing system resources, device drivers, and network communication. The net/sched module within the kernel is responsible for implementing network traffic control and shaping mechanisms. One of the components in this module is act_skbmod, which allows modification of packet metadata. However, a vulnerability has been identified in the act_skbmod component that can lead to security issues.
Vulnerability Detail
The vulnerability in the act_skbmod component of the net/sched module allows non-Ethernet packets to bypass the intended filtering mechanism. This means that packets other than Ethernet frames can potentially be processed and modified by act_skbmod, which may result in unexpected behavior or security vulnerabilities. The impact and attack plausibility of this vulnerability have not been proven yet, but it poses a potential risk to the integrity and security of network communication.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
There is no specific workaround mentioned for this vulnerability. However, users can consider implementing additional network-level security measures, such as packet filtering rules, to minimize the potential impact of this vulnerability until the kernel update can be applied.
Conclusion
The vulnerability in the act_skbmod component of the net/sched module in the Linux Kernel can potentially allow non-Ethernet packets to bypass filtering mechanisms. It is recommended to update the kernel to version v5.13.6 or later to mitigate this vulnerability. Additional network-level security measures can be implemented as a temporary workaround. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The net/sched module in the Linux Kernel is responsible for network traffic control and shaping mechanisms. It provides functionality for managing packet classification, queuing, and modification.
The act_skbmod component in the net/sched module allows modification of packet metadata. It is designed to process Ethernet packets and apply specified modifications based on configured rules.
The impact of this vulnerability is not yet proven, but it has the potential to allow non-Ethernet packets to bypass filtering mechanisms and be processed by act_skbmod. This can result in unexpected behavior or security vulnerabilities.
To fix this vulnerability, it is recommended to update the Linux Kernel to version v5.13.6 or later. This ensures that the act_skbmod component properly skips non-Ethernet packets.
While there is no specific workaround mentioned for this vulnerability, users can consider implementing additional network-level security measures, such as packet filtering rules, to minimize the potential impact until the kernel update can be applied.
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