IOMMU Vulnerability in Linux Kernel affecting MSI Interrupts

CVE-2025-38062

What is CVE-2025-38062?

In the Linux Kernel, a vulnerability exists in the handling of MSI message addresses due to the absence of proper locking mechanisms at the IRQ layer. This issue arises during the two-step IOMMU translation process for MSI interrupts, where a cookie pointer is stored in the MSI descriptor without ensuring its validity across operations. The lack of protective measures can lead to user-after-free (UAF) conditions, particularly when the IOMMU domain can be changed dynamically during VFIO operations. The fix involves eliminating the cookie pointer and directly storing the translated IOVA address in the MSI descriptor, thereby enhancing security.

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