Improper Error Handling in Linux Kernel's IOMMU Functionality by Linux Foundation

CVE-2026-64152

What is CVE-2026-64152?

A vulnerability exists in the Linux kernel related to improper error handling during IOMMU unmap processes. Specifically, when iommu_debug is enabled, the error flow inadvertently called iommu_unmap(), which in turn triggered debugging functions without having a corresponding established mapping from iommu_debug_map(). This can lead to unbalanced tracking and may compromise the integrity of memory management and tracing operations. Fixing this involves strategic reordering of operations to ensure that unmap actions are properly recorded, thus enhancing stability and reducing the potential for malfunction during debugging processes.

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