Critical NULL Dereference Vulnerability in Linux Kernel (Debian:13 and Debian:14)
Summary
DEBIAN-CVE-2024-56646: In the Linux kernel, the following vulnerability has been resolved: ipv6: avoid possible NULL deref in modify_prefix_route() syzbot found a NULL deref [1] in modify_prefix_route(), caused by one fib6_info without a fib6_... Affects linux versions < 6.12.5-1. Fixed in 6.12.5-1. 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 facilitating communication between hardware and software. It is widely used across various platforms, including servers, desktops, and embedded systems. The kernel's stability and security are paramount, as vulnerabilities can lead to system crashes, data loss, or unauthorized access. This specific vulnerability affects the IPv6 handling within the kernel, where a NULL dereference can occur under certain conditions, potentially leading to a system crash.
Vulnerability Detail
In the Linux kernel, a vulnerability has been identified in the modify_prefix_route() function related to IPv6. This issue arises when a fib6_info structure lacks a valid fib6_table pointer, which can occur due to the net->ipv6.fib6_null_entry being improperly set. The vulnerability can lead to a NULL dereference, causing a general protection fault. This can result in system instability, crashes, or denial of service, particularly affecting systems that rely on IPv6 networking.
How To Fix
Minimum fixed version
6.12.5-1
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, no specific workaround is provided 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 identified NULL dereference vulnerability in the Linux kernel poses significant risks to system stability and security, particularly for users of Debian:13 and Debian:14. Immediate action is required to update to the patched version to mitigate these risks. Regular updates and monitoring for vulnerabilities are crucial for maintaining a secure system.
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FAQ
A NULL dereference vulnerability occurs when a program attempts to access memory at a NULL pointer, leading to unexpected behavior, crashes, or security issues.
You can use Vulert, which monitors and alerts for open-source vulnerabilities in your software. By using the Vulert playground, you can check if your application is affected without requiring access to the code.
The potential impacts include system crashes, data loss, and denial of service, particularly for systems utilizing IPv6 networking.
Yes, if the vulnerability is exploited, it can lead to system crashes, which may result in data loss if unsaved work is present.
It is recommended to regularly check for updates and apply them promptly to ensure your system is protected against known vulnerabilities.
References
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