Recursive Socket Vulnerability in Linux Kernel: Impacting Debian Packages
Summary
DEBIAN-CVE-2024-44996: In the Linux kernel, the following vulnerability has been resolved: vsock: fix recursive ->recvmsg calls After a vsock socket has been added to a BPF sockmap, its prot->recvmsg has been replaced with vsock_bpf_recvmsg(). Affects linux versions < 6.10.7-1. Fixed in 6.10.7-1. How to fix ↓
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Background
The Linux kernel is the core component of the Linux operating system, responsible for managing hardware and system resources. It provides essential services for all other parts of the operating system, including process management, memory management, and device control. The kernel is highly modular, allowing for various functionalities to be added or removed as needed. However, vulnerabilities can arise, such as the one identified in the vsock implementation, which can lead to potential security risks if not addressed promptly.
Vulnerability Detail
In the Linux kernel, a vulnerability was discovered in the vsock implementation where recursive calls to the ->recvmsg function could occur after a vsock socket is added to a BPF sockmap. This recursion could lead to a stack overflow or denial of service, as the function calls would loop indefinitely, causing the system to become unresponsive. The vulnerability arises from the improper handling of the socket's message reception logic, which fails to separate BPF sockmap operations from the original socket operations.
How To Fix
Minimum fixed version
6.10.7-1
This is the first release that contains the fix.
sudo apt-get install --only-upgrade linuxTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
Currently, there are no specific workarounds mentioned for this vulnerability. The best course of action is to apply the patch by updating to the fixed version of the Linux kernel.
Conclusion
The recursive socket vulnerability in the Linux kernel poses a significant risk to systems running Debian 13 and 14. It is essential for users to update their kernel to the patched version 6.10.7-1 to protect against potential exploits. Regular monitoring and updates are crucial for maintaining system security.
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FAQ
The vulnerability involves recursive calls in the vsock implementation of the Linux kernel, which can lead to stack overflow or denial of service.
Debian 13 and 14 are affected by this vulnerability, specifically versions prior to 6.10.7-1.
You can use tools like Vulert, which monitors open-source vulnerabilities in your software using a manifest file. Visit Vulert Scanner to check if your application is affected.
While there are no specific workarounds, it is crucial to plan for an update as soon as possible to mitigate the risk.
As of now, the urgency for this vulnerability has not been assigned, indicating that it may not be widely exploited, but it is still important to address it promptly.
References
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