Data Race Vulnerability in Linux Kernel
Summary
GSD-2022-1004666: tcp: Fix a data-race around sysctl_tcp_early_retrans. Affects Kernel versions >= eed530b6c67624db3f2cf477bac7c4d005d8f7ba, < 83767fe800a311370330d4ec83aa76093b744a80. No fix is published. How to fix ↓
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Background
The Linux Kernel is the core component of the Linux operating system, responsible for managing system resources and providing an interface between hardware and software. It is a critical piece of software that enables the functioning of various applications and services on Linux-based systems. The vulnerability identified in this report pertains to the TCP implementation in the Linux Kernel.
Vulnerability Detail
The vulnerability in the Linux Kernel involves a data race around the sysctl_tcp_early_retrans parameter. A data race occurs when multiple threads or processes access shared data concurrently without proper synchronization, leading to unpredictable behavior and potential security vulnerabilities. In this case, the data race can result in incorrect handling of TCP early retransmission, potentially leading to network instability, performance degradation, or even remote code execution.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a workaround, users can disable the sysctl_tcp_early_retrans parameter by setting its value to 0. This can be achieved by modifying the kernel configuration or using the sysctl command. However, it is strongly advised to apply the official fix by updating the kernel to the latest version, as workarounds may have limitations and can introduce other issues.
Conclusion
In conclusion, the data race vulnerability in the Linux Kernel around the sysctl_tcp_early_retrans parameter can have serious implications for network stability and security. It is crucial to update the kernel to the latest version to ensure the vulnerability is addressed. For further support and assistance in vulnerability remediation, please contact DevNack.com.
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FAQ
A data race occurs when multiple threads or processes access shared data concurrently without proper synchronization. It can lead to unpredictable behavior and potential security vulnerabilities.
sysctl_tcp_early_retrans is a parameter in the Linux Kernel that controls the behavior of TCP early retransmission. It determines when the TCP stack should retransmit packets to improve network performance.
The data race vulnerability in the Linux Kernel can result in incorrect handling of TCP early retransmission, leading to network instability, performance degradation, or even remote code execution.
To fix this vulnerability, it is recommended to update the Linux Kernel to version v5.4.208 or later. This will ensure that the data race is resolved and the system is protected against potential exploits.
As a workaround, users can disable the sysctl_tcp_early_retrans parameter by setting its value to 0. However, it is strongly advised to apply the official fix by updating the kernel to the latest version, as workarounds may have limitations and can introduce other issues.
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