UAF Vulnerability in Linux Kernel - Debian Packages Affected
Summary
DEBIAN-CVE-2024-56635: In the Linux kernel, the following vulnerability has been resolved: net: avoid potential UAF in default_operstate() syzbot reported an UAF in default_operstate() [1] Issue is a race between device and netns dismantles. 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 Debian operating system, responsible for managing hardware and system resources. It provides essential services for all other parts of the operating system. The kernel is critical for system stability and security, and vulnerabilities within it can lead to severe consequences, including system crashes and unauthorized access.
Vulnerability Detail
The vulnerability identified as DEBIAN-CVE-2024-56635 is a use-after-free (UAF) issue in the Linux kernel's default_operstate() function. This flaw arises from a race condition between device and network namespace dismantling, which can lead to accessing freed memory. The issue was reported by syzbot and can result in system instability or potential exploitation by attackers to execute arbitrary code.
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, there are no specific workarounds provided for this vulnerability. The best course of action is to apply the patch as soon as it is available.
Conclusion
The DEBIAN-CVE-2024-56635 vulnerability in the Linux kernel poses significant risks to system stability and security. Users are urged to update their systems to the patched version 6.12.5-1 to mitigate these risks. Utilizing tools like Vulert can help in monitoring and managing vulnerabilities effectively.
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FAQ
A use-after-free vulnerability occurs when a program continues to use a memory reference after it has been freed, potentially leading to arbitrary code execution or crashes.
You can use Vulert, which monitors open-source vulnerabilities in real-time. By uploading your manifest file like package-lock.json, you can check for vulnerabilities without needing to install any software.
The risks include system crashes, unauthorized access, and potential exploitation by attackers to execute malicious code.
Yes, the patched version 6.12.5-1 for Debian 13 and 14 addresses this vulnerability. It is recommended to update to this version.
Detailed information can be found in the official Debian CVE database or by visiting Vulert's website for real-time monitoring of vulnerabilities.
References
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