Data-races around sysctl_tcp_recovery in Kernel
Summary
GSD-2022-1004665: tcp: Fix data-races around sysctl_tcp_recovery. Affects Kernel versions >= 4f41b1c58a32537542f14c1150099131613a5e8a, < 92c35113c63306091df9211375eebd0abd8c2160. No fix is published. How to fix ↓
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Background
The Kernel is a critical component of the Linux operating system that provides core functionalities and acts as a bridge between hardware and software. It manages system resources, facilitates communication between processes, and handles device drivers. The sysctl_tcp_recovery feature in the Kernel is responsible for managing TCP recovery mechanisms. However, a vulnerability has been identified in this feature that could lead to data-races, potentially impacting the stability and security of the system.
Vulnerability Detail
The vulnerability in sysctl_tcp_recovery arises due to data-races, which occur when multiple threads or processes access shared data concurrently without proper synchronization. This can result in unpredictable behavior, including race conditions, memory corruption, and crashes. Attackers may exploit this vulnerability to gain unauthorized access, execute arbitrary code, or cause denial-of-service conditions. The vulnerability was introduced in Kernel version 4.4 and is fixed in version 5.4.208 by commit 92c35113c63306091df9211375eebd0abd8c2160.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a temporary workaround, users can disable the sysctl_tcp_recovery feature by modifying the Kernel configuration. This can be achieved by setting the corresponding sysctl parameter to a value of 0. However, it is important to note that disabling this feature may impact TCP recovery mechanisms and should only be considered as a temporary measure until the Kernel is updated.
Conclusion
The data-races vulnerability in sysctl_tcp_recovery within the Kernel can have severe consequences, including unpredictable behavior, memory corruption, and potential security breaches. It is crucial to update the Kernel to version 5.4.208 or later to address this vulnerability. In the meantime, users can consider disabling the sysctl_tcp_recovery feature as a temporary workaround. For further support and assistance in vulnerability remediation, please contact DevNack.com.
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FAQ
The vulnerability can lead to data-races, which may result in unpredictable behavior, memory corruption, crashes, and potential security breaches.
You can use tools like Vulert Playground (https://vulert.com/scanner) to check if your system is affected by this vulnerability. Vulert analyzes the manifest file (e.g., package-lock.json) to identify and alert in real-time for open-source vulnerabilities.
Yes, a temporary workaround is to disable the sysctl_tcp_recovery feature by modifying the Kernel configuration. However, this should only be considered as a temporary measure until the Kernel is updated.
To fix this vulnerability, it is recommended to update the Kernel to version 5.4.208 or later. You can download the latest stable version from the official Linux Kernel repository and follow the provided installation instructions.
At the time of this report, no known exploits for this vulnerability have been reported. However, it is crucial to apply the necessary updates to mitigate the risk.
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