Critical Vulnerability in Linux Kernel - Device Counting Error in vfio/pci
Summary
DEBIAN-CVE-2024-41052: In the Linux kernel, the following vulnerability has been resolved: vfio/pci: Init the count variable in collecting hot-reset devices The count variable is used without initialization, it results in mistakes in the devic... Affects linux versions < 6.9.10-1. Fixed in 6.9.10-1. 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 to applications. It is widely used across various platforms, including servers, desktops, and embedded systems. The kernel's functionality includes process management, memory management, device drivers, and system calls. This vulnerability specifically affects the vfio/pci subsystem, which is responsible for managing PCI devices in a virtualized environment. The issue arises from an uninitialized variable that can lead to incorrect device counting and potential crashes in userspace applications.
Vulnerability Detail
In the Linux kernel, a vulnerability has been identified in the vfio/pci subsystem where the count variable is used without proper initialization. This oversight can lead to incorrect counting of devices, which may trigger crashes in userspace when the hot-reset info path is accessed. The vulnerability can be exploited in environments that rely on hot-reset functionality for PCI devices, potentially causing system instability and affecting the availability of services.
How To Fix
Minimum fixed version
6.9.10-1
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. However, avoiding the use of hot-reset functionality for PCI devices may mitigate the risk until the patch is applied.
Conclusion
The identified vulnerability in the Linux kernel's vfio/pci subsystem poses a significant risk due to its potential to cause crashes in userspace applications. It is crucial for users of Debian 13 and 14 to update to the patched version 6.9.10-1 to mitigate this risk. Regular monitoring for vulnerabilities using tools like Vulert can help maintain the security of your systems.
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FAQ
The vulnerability involves an uninitialized variable in the vfio/pci subsystem of the Linux kernel, leading to incorrect device counting.
Exploitation of this vulnerability can cause crashes in userspace applications that rely on the hot-reset functionality, leading to system instability.
Yes, a patch has been released in version 6.9.10-1 of the Linux package for Debian systems.
While there are no specific workarounds, it is advisable to avoid using the hot-reset functionality for PCI devices until the patch is applied.
You can use Vulert, which monitors and alerts for open-source vulnerabilities in real-time. Visit Vulert Scanner to check if your application is affected without needing to sign up.
References
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