Critical Vulnerability in Linux Kernel: NULL Pointer Dereference in NVIDIA SMMU Context Fault
Summary
DEBIAN-CVE-2024-36884: In the Linux kernel, the following vulnerability has been resolved: iommu/arm-smmu: Use the correct type in nvidia_smmu_context_fault() This was missed because of the function pointer indirection. Affects linux versions < 6.8.11-1. Fixed in 6.8.11-1. 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 supports a wide range of hardware architectures and is known for its stability and performance. This vulnerability affects the Linux kernel versions in Debian 13 and 14, specifically related to the IOMMU (Input-Output Memory Management Unit) functionality, which is crucial for managing memory access for devices.
Vulnerability Detail
In the Linux kernel, a vulnerability has been identified in the function nvidia_smmu_context_fault(), which is responsible for handling context faults in the NVIDIA System Memory Management Unit (SMMU). The issue arises from a type mismatch where a 'void *' pointer was incorrectly used instead of a struct arm_smmu_domain. This misconfiguration can lead to a NULL pointer dereference, resulting in a kernel panic and potential system instability. The vulnerability is critical as it can be exploited to crash the system or lead to unauthorized access to system resources.
How To Fix
Minimum fixed version
6.8.11-1
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 patch as soon as it is available.
Conclusion
The identified vulnerability in the Linux kernel related to the NVIDIA SMMU context fault poses significant risks to system stability and security. Users are strongly advised to update to the patched version to protect their systems from potential exploitation. Regular monitoring for vulnerabilities using tools like Vulert can help maintain system integrity.
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FAQ
The vulnerability can lead to a kernel panic, causing the system to crash and potentially resulting in data loss or corruption.
The vulnerability affects the Linux kernel versions in Debian 13 and 14 prior to the patch version 6.8.11-1.
You can use tools like Vulert to monitor and alert for open-source vulnerabilities in your software. Visit Vulert Scanner to check if your application is affected.
Yes, if left unpatched, this vulnerability could be exploited by malicious actors to crash the system or gain unauthorized access.
While there are no specific workarounds, it is crucial to plan for an update as soon as possible to mitigate the risk associated with this vulnerability.
References
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