Linux Kernel Vulnerability in IOMMU Driver Impacting Memory Management

CVE-2026-64151

What is CVE-2026-64151?

A vulnerability in the Linux kernel's IOMMU driver was identified where PAGE_SIZE could be improperly dropped from the pgsize_bitmap. While this scenario is not typical and would not be utilized with the DMA API, it deviates from expected design principles. The issue has been rectified by moving the PT_WARN_ON check to the appropriate branch, ensuring that the functionality adheres to design specifications and maintains optimal memory management practices.

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