Kernel NULL Pointer Dereference Vulnerability in Linux Package
Summary
DEBIAN-CVE-2024-27079: In the Linux kernel, the following vulnerability has been resolved: iommu/vt-d: Fix NULL domain on device release In the kdump kernel, the IOMMU operates in deferred_attach mode. Affects linux versions < 6.8.9-1. Fixed in 6.8.9-1. How to fix ↓
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Background
The Linux package is a core component of the Debian operating system, providing essential functionalities for managing hardware and system resources. It is responsible for handling system calls, memory management, and device interactions. The package is crucial for system stability and performance, making it a prime target for vulnerabilities that could compromise system integrity.
Vulnerability Detail
In the Linux kernel, a vulnerability has been identified in the IOMMU (Input-Output Memory Management Unit) related to device release operations. Specifically, when operating in deferred_attach mode, the info->domain may not be assigned before the release_device function is invoked. This can lead to a kernel NULL pointer dereference, resulting in a crash. The error manifests as a bug when the kernel attempts to access a null address, causing system instability and potential data loss.
How To Fix
Minimum fixed version
6.8.9-1
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. It is advisable to apply the patch as soon as it is available to mitigate risks.
Conclusion
The identified vulnerability in the Linux kernel poses significant risks to system stability and data integrity. It is crucial for users to update their systems to the patched version 6.8.9-1 to mitigate these risks. Regular monitoring and prompt updates are essential for maintaining system security.
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FAQ
The vulnerability can lead to a kernel crash due to a NULL pointer dereference, which can disrupt system operations and potentially result in data loss.
You can use the Vulert platform to monitor and alert for open-source vulnerabilities in your software. Visit Vulert Scanner to check if your application is affected without needing to sign up.
The vulnerability affects the Linux package in Debian 13 and 14, specifically versions prior to 6.8.9-1.
Yes, the crash caused by this vulnerability can lead to data loss, especially if the system is not properly shut down before the crash occurs.
If you cannot update immediately, ensure to back up your data regularly and monitor your system for any unusual behavior until the patch can be applied.
References
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