mptcp: Fix Possible Stall on recvmsg() in Linux Kernel
Summary
GSD-2021-1001896: mptcp: fix possible stall on recvmsg(). Affects Kernel versions >= 7a6a6cbc3e592e339ad23e4e8ede9a3f6160bda8, < 1a4554e94f0deff9fc1dc5addf93fa579cc29711. No fix is published. How to fix ↓
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Background
The Linux Kernel is a widely used open-source operating system kernel that serves as the foundation for various Linux distributions. It provides essential functionalities and interfaces for hardware, software, and user applications. The MultiPath TCP (MPTCP) is an extension to the TCP protocol that enables the simultaneous use of multiple network paths for a single TCP connection. This feature enhances performance, reliability, and resilience in network communication. However, a vulnerability has been discovered in the MPTCP implementation that could lead to a possible stall on the recvmsg() function.
Vulnerability Detail
The vulnerability in the MPTCP implementation can cause a potential stall on the recvmsg() function. This could result in a denial-of-service (DoS) condition or impact the reliability and responsiveness of network communication. The exact attack vector and impact are yet to be proven. The vulnerability was introduced in Linux Kernel version v5.6 by commit 7a6a6cbc3e592e339ad23e4e8ede9a3f6160bda8 and has been fixed in version v5.14.14 by commit 1a4554e94f0deff9fc1dc5addf93fa579cc29711.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As this vulnerability has been fixed in the latest version of the Linux Kernel, there is no specific workaround available. It is advised to update to the fixed version as soon as possible.
Conclusion
The vulnerability in the MPTCP implementation of the Linux Kernel could lead to a possible stall on the recvmsg() function, impacting network communication. It is crucial to update the Linux Kernel to version v5.14.14 or later to mitigate this vulnerability. For further support and assistance in vulnerability remediation, you can contact DevNack.com.
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FAQ
The impact of this vulnerability could lead to a denial-of-service (DoS) condition or affect the reliability and responsiveness of network communication.
You can use the Vulert Playground (https://vulert.com/scanner) to check if your system is affected by this vulnerability. Simply upload your package-lock.json file and it will provide real-time monitoring and alerts for open-source vulnerabilities.
Yes, a patch for this vulnerability is available in Linux Kernel version v5.14.14 and later.
No, updating the Linux Kernel to the fixed version is the recommended approach to mitigate this vulnerability.
You can refer to the official Linux Kernel documentation (https://www.kernel.org/doc/html/latest/) and the MPTCP website (https://www.multipath-tcp.org/) for more information about the Linux Kernel and MPTCP.
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