IOMMU DMA Cleanup Vulnerability in Linux Package: A Critical Security Flaw
Summary
DEBIAN-CVE-2025-37877: In the Linux kernel, the following vulnerability has been resolved: iommu: Clear iommu-dma ops on cleanup If iommu_device_register() encounters an error, it can end up tearing down already-configured groups and default d... Affects linux versions < 6.12.27-1. Fixed in 6.12.27-1. How to fix ↓
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Background
The Linux kernel is a core component of the Debian operating system, responsible for managing hardware resources and providing essential services to applications. It facilitates communication between software and hardware, ensuring efficient operation of system resources. The kernel is highly modular, allowing for various drivers and subsystems to be integrated, which can sometimes lead to vulnerabilities. This specific vulnerability relates to the IOMMU (Input-Output Memory Management Unit) subsystem, which is crucial for managing direct memory access (DMA) operations by devices.
Vulnerability Detail
In the Linux kernel, a vulnerability has been identified in the IOMMU subsystem where the function iommu_device_register() may fail, leading to improper cleanup of already-configured groups and default domains. This oversight can leave devices still connected to iommu-dma, potentially causing system crashes and inconsistent behavior across different architectures and drivers. The issue arises from the failure to reset the dev->dma_iommu flag, which is critical for ensuring that the system behaves as if the IOMMU driver was never present. This vulnerability can lead to severe ramifications, including system instability and security risks associated with DMA operations.
How To Fix
Minimum fixed version
6.12.27-1
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, no specific workarounds have been provided for this vulnerability. However, users are advised to ensure that their systems are updated regularly and to monitor for any patches released by the Debian team.
Conclusion
The identified vulnerability in the Linux kernel's IOMMU subsystem poses significant risks to system stability and security. Users are strongly encouraged to update their systems to the patched version to protect against potential exploits. Regular monitoring and maintenance of software packages are essential to ensure ongoing security.
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FAQ
The IOMMU subsystem in the Linux kernel manages memory access for devices, allowing them to perform DMA operations safely and efficiently.
This vulnerability can lead to system crashes and inconsistent behavior, especially if devices are still connected to iommu-dma after an error occurs during IOMMU registration.
If you are using an affected version of the Linux kernel (prior to 6.12.27-1), your system may be vulnerable. You can check your version using the command 'uname -r'.
You can use Vulert, which monitors and alerts for open-source vulnerabilities in your software using just a manifest file like package-lock.json. You can check your application for vulnerabilities without any signup at the Vulert playground.
While there are no specific workarounds, it is crucial to regularly check for updates and apply them as soon as possible to mitigate the risks associated with this vulnerability.
References
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