net/sched: act_skbmod: Skip non-Ethernet packets
Summary
GSD-2021-1001240: net/sched: act_skbmod: Skip non-Ethernet packets. Affects Kernel versions >= 86da71b57383d40993cb90baafb3735cffe5d800, < 071729150be9e1d1b851b70efb6d91ee9269d57b. No fix is published. How to fix ↓
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Background
The Linux Kernel is an open-source monolithic Unix-like computer operating system kernel. It provides the core functionality for the Linux operating system. The 'net/sched' subsystem in the Linux Kernel is responsible for managing network traffic scheduling and shaping. Within this subsystem, the 'act_skbmod' module modifies packets in the network traffic stream. However, a vulnerability exists in the 'act_skbmod' module where it fails to skip non-Ethernet packets, potentially leading to unexpected behavior or security issues.
Vulnerability Detail
The vulnerability in the 'act_skbmod' module allows non-Ethernet packets to be processed, which can result in unintended consequences or security vulnerabilities. This issue was introduced in Linux Kernel version 4.9 and was fixed in version 5.10.54. 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
There is no specific workaround mentioned for this vulnerability.
Conclusion
In conclusion, the 'act_skbmod' module in the 'net/sched' subsystem of the Linux Kernel has a vulnerability that allows non-Ethernet packets to be processed. This vulnerability was fixed in Linux Kernel version 5.10.54. It is recommended to update the kernel to mitigate the vulnerability. For further support on vulnerability remediation, you can contact DevNack.com.
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FAQ
The impact of this vulnerability is currently unknown as the attack plausibility has not been proven. However, it could potentially lead to unexpected behavior or security issues.
You can use Vulert's playground (https://vulert.com/scanner) to check if your system is affected by this vulnerability. Vulert monitors and alerts in real-time for open-source vulnerabilities without requiring access to the code or installation.
Yes, a fix is available in Linux Kernel version 5.10.54 or later. Updating the kernel to this version will address the vulnerability.
There are no known exploits for this vulnerability at the moment.
You can find more information about this vulnerability in the Open Source Vulnerability Database (OSVDB) entry: https://github.com/cloudsecurityalliance/gsd-database/blob/main/2021/1001xxx/GSD-2021-1001240.json
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