net/sched: act_ct: fix ref leak when switching zones in Kernel
Summary
GSD-2022-1001487: net/sched: act_ct: fix ref leak when switching zones. Affects Kernel versions >= e9408de00e5ecd0dbe91cf061c7da23711c4febb, < 4bb42d73def9411e5cad885b9811987d72431df1. No fix is published. How to fix ↓
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Background
The Kernel is a crucial component of the Linux operating system that manages the system's resources and facilitates communication between hardware and software. It provides essential functionalities such as process management, memory management, and device drivers. The act_ct module in the net/sched subsystem is responsible for handling connection tracking actions in the network scheduler. It allows for the classification and manipulation of network packets based on their connection state. However, a vulnerability has been discovered in the act_ct module that can lead to a reference leak when switching zones.
Vulnerability Detail
The vulnerability in the act_ct module occurs when switching zones, resulting in a reference leak. This can potentially lead to resource exhaustion and denial-of-service attacks. An attacker could exploit this vulnerability to exhaust system resources, causing the system to become unresponsive or crash. The vulnerability was introduced in version v5.16.12 of the Linux Kernel and has been fixed in version v5.16.19.
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
The vulnerability in the act_ct module of the Kernel can lead to resource exhaustion and denial-of-service attacks. It is recommended to update the Linux Kernel to version v5.16.19 or later to mitigate this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The vulnerability can lead to resource exhaustion and denial-of-service attacks, potentially causing the system to become unresponsive or crash.
You can use Vulert Playground (https://vulert.com/scanner) to check if your system is affected by this vulnerability. Simply upload your package-lock.json file to the playground, and it will alert you in real-time if the vulnerability is detected.
Yes, the vulnerability has been fixed in version v5.16.19 of the Linux Kernel. It is recommended to update to this version or later to mitigate the vulnerability.
The exact attack vector and exploitability of this vulnerability have not been proven yet. However, it is always recommended to apply security patches and updates to ensure the system's security.
There are no known instances of this vulnerability being exploited in the wild at the time of this report. However, it is important to stay vigilant and apply necessary security measures to protect against potential attacks.
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