Critical MSI Descriptor Vulnerability in Linux Kernel Affecting Debian Packages
Summary
CVE-2025-38062: In the Linux kernel, the following vulnerability has been resolved: genirq/msi: Store the IOMMU IOVA directly in msi_desc instead of iommu_cookie The IOMMU translation for MSI message addresses has been a 2-step process,... Affects linux versions 5.10.103-1 – 6.9.9-1. No fix is published. 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 distributions, including Debian. This vulnerability specifically impacts the MSI (Message Signaled Interrupts) handling within the kernel, which is crucial for efficient interrupt management in modern hardware. The vulnerability arises from improper handling of IOMMU (Input-Output Memory Management Unit) translations, leading to potential security risks.
Vulnerability Detail
The vulnerability, identified as CVE-2025-38062, originates from a flaw in the MSI descriptor handling within the Linux kernel. The issue is related to the two-step process of IOMMU translation for MSI message addresses, where a cookie pointer is stored in the MSI descriptor without adequate lifetime management. This can lead to use-after-free (UAF) conditions, allowing attackers to exploit the vulnerability by manipulating the IOMMU domain during VFIO operations. The lack of locking mechanisms at the IRQ layer exacerbates the risk, potentially compromising system integrity and security.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
Currently, there are no specific workarounds mentioned for this vulnerability. It is recommended to apply the patch as soon as it becomes available to ensure system security.
Conclusion
CVE-2025-38062 represents a significant vulnerability in the Linux kernel that affects multiple Debian packages. It is crucial for users to stay informed about this issue and apply the necessary updates to protect their systems. Utilizing tools like Vulert can help monitor and alert for such vulnerabilities in real-time.
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FAQ
CVE-2025-38062 is a vulnerability in the Linux kernel related to improper handling of MSI descriptors, leading to potential use-after-free conditions.
This vulnerability can compromise system integrity by allowing attackers to exploit the IOMMU domain during VFIO operations, potentially leading to unauthorized access or system crashes.
You should update your Linux kernel to the patched version (6.12.32-1 for Debian 13) as soon as possible to mitigate the risks associated with this vulnerability.
Currently, there are no specific workarounds available. The best course of action is to apply the patch promptly.
You can use Vulert, a tool that monitors open-source vulnerabilities in your software. By simply using a manifest file like package-lock.json, you can check for vulnerabilities without needing to access the code or installation.
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