net/sched: act_ct: fix ref leak when switching zones in Kernel
Summary
GSD-2022-1001803: net/sched: act_ct: fix ref leak when switching zones. Affects Kernel versions >= a95ea90deb3071c1ded77a05e91cfebc5238d908, < bcbf4e5c3b5b373cd61528392dd1ec8e9c0fd33d. No fix is published. How to fix ↓
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Background
The Kernel is a critical component of the Linux operating system that manages the system's resources and facilitates communication between hardware and software. It provides essential functionality for the proper functioning of the system. The act_ct module in the net/sched subsystem is responsible for handling connection tracking actions. It allows for the classification and manipulation of network packets based on connection tracking information. 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, leading to a reference leak. This can result in resource exhaustion and potential denial-of-service attacks. An attacker could exploit this vulnerability to exhaust system resources, causing instability or crashes. The vulnerability was introduced in version v5.15.26 of the Linux Kernel and has been fixed in version v5.15.33.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
There is no known workaround for this vulnerability. It is essential to apply the fix by updating to the patched version of the Linux Kernel.
Conclusion
The vulnerability in the act_ct module of the Kernel can lead to resource exhaustion and potential denial-of-service attacks. It is crucial to update the Linux Kernel to version v5.15.33 or later to address this vulnerability. Failure to apply the fix may result in system instability or crashes. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The vulnerability can lead to resource exhaustion and potential denial-of-service attacks. It may cause system instability or crashes.
You can use the Vulert Playground at Vulert 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 if the vulnerability is present.
At the time of this report, there is no known exploit for this vulnerability. However, it is crucial to apply the fix as soon as possible to mitigate any potential risks.
Yes, this vulnerability can be remotely exploited by an attacker. They can send specially crafted packets to trigger the reference leak and exhaust system resources.
The only effective mitigation is to update the Linux Kernel to the patched version. It is recommended to regularly update the Kernel to ensure the latest security fixes are applied.
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