net/sched: act_skbmod: Skip non-Ethernet packets
Summary
GSD-2021-1001370: net/sched: act_skbmod: Skip non-Ethernet packets. Affects Kernel versions >= 86da71b57383d40993cb90baafb3735cffe5d800, < e4fdca366806f6bab374d1a95e626a10a3854b0c. No fix is published. How to fix ↓
Check if this vulnerability affects your application
Upload a manifest or SBOM and we'll show whether you're affected, plus every other risky package in the same scan.
No signup required · Results in about 60 seconds
Background
The Linux Kernel is an open-source monolithic Unix-like computer operating system kernel. It provides the essential services for the operating system, such as process management, memory management, device management, and file system management. The act_skbmod module in the net/sched subsystem is responsible for modifying packets in the network stack. However, a vulnerability has been discovered in this module that allows non-Ethernet packets to bypass the packet modification process, potentially leading to security issues.
Vulnerability Detail
The vulnerability in the act_skbmod module allows non-Ethernet packets to skip the packet modification process. This means that packets other than Ethernet packets can bypass any intended modifications, which may have security implications. The impact and attack plausibility of this vulnerability have not been proven yet. The vulnerability was introduced in Linux Kernel version v4.9 by commit 86da71b57383d40993cb90baafb3735cffe5d800 and is fixed in version v4.19.199 by commit e4fdca366806f6bab374d1a95e626a10a3854b0c.
How To Fix
No fixed version is published for this vulnerability.
Tip — Not sure whether your app is affected? Vulert can check the versions your app actually runs. Scan free →
Workaround
There is no specific workaround mentioned for this vulnerability.
Conclusion
The act_skbmod vulnerability in the Linux Kernel's net/sched subsystem allows non-Ethernet packets to bypass packet modification, potentially leading to security issues. It is recommended to update the Linux Kernel to version v4.19.199 or later to mitigate this vulnerability. For further support on vulnerability remediation, you can contact DevNack.com.
See every vulnerability recorded for Kernel →
FAQ
The impact of this vulnerability is not yet proven. However, it could potentially lead to security issues if non-Ethernet packets bypass intended modifications.
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, the vulnerability is fixed in Linux Kernel version v4.19.199. It is recommended to update to this version or later to mitigate the risk.
There are no known exploits for this vulnerability at the moment. However, it is always important to stay updated with the latest security patches to minimize the risk of exploitation.
You can find more information about this vulnerability in the Open Source Vulnerability Database (OSVDB) entry with ID GSD-2021-1001370.
Related vulnerabilities
Recent vulnerabilities recorded for Kernel.
