Critical UAF Vulnerability in Linux Kernel Package: linux (Debian 13 & 14)
Summary
DEBIAN-CVE-2024-49865: In the Linux kernel, the following vulnerability has been resolved: drm/xe/vm: move xa_alloc to prevent UAF Evil user can guess the next id of the vm before the ioctl completes and then call vm destroy ioctl to trigger U... Affects linux versions < 6.11.4-1. Fixed in 6.11.4-1. How to fix ↓
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Background
The Linux kernel is the core component of the Linux operating system, responsible for managing hardware resources and providing essential services for software applications. 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 severe system compromises. This specific vulnerability affects the 'linux' package in Debian versions 13 and 14, highlighting its susceptibility to user-after-free (UAF) issues.
Vulnerability Detail
In the Linux kernel, a user-after-free (UAF) vulnerability has been identified within the DRM subsystem, specifically in the handling of virtual machines (VMs). An attacker can exploit this vulnerability by guessing the next ID of a VM before the ioctl operation completes, allowing them to call the VM destroy ioctl prematurely. This can lead to a situation where the kernel references freed memory, potentially resulting in arbitrary code execution or system crashes. The vulnerability has been addressed by moving the xa_alloc operation to the end of the process, preventing the UAF condition.
How To Fix
Minimum fixed version
6.11.4-1
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 available patch by updating the package as described above.
Conclusion
The UAF vulnerability in the Linux kernel package poses significant risks to system security. Users are strongly advised to update to the patched version 6.11.4-1 to mitigate these risks. Regular updates and monitoring for vulnerabilities are essential practices for maintaining a secure environment.
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FAQ
A user-after-free (UAF) vulnerability occurs when a program continues to use a pointer after the memory it points to has been freed. This can lead to unpredictable behavior, including crashes or arbitrary code execution.
You can use Vulert, which monitors and alerts for open-source vulnerabilities in your software. By uploading your manifest file, such as package-lock.json, you can check for vulnerabilities without needing to access the code directly.
Exploitation of this vulnerability could allow an attacker to execute arbitrary code, leading to system crashes, data breaches, or unauthorized access to system resources.
While the primary risk is unauthorized code execution, there is a potential for data loss if the attacker manipulates system processes or accesses sensitive information.
It is recommended to regularly check for updates and apply them promptly, especially for critical security patches like this one, to maintain system integrity and security.
References
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