CVE-2025-39961

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description The AMD IOMMU host page table implementation has a potential race condition during page table level increases. Specifically, in the unmap path (iommu v1 unmap pages()), the fetch pte() function reads page table level information (pgtable->[root/mode]) without a lock. This can occur when increase address space() is updating pgtable->[root/mode], potentially leading fetch pte() to read an incorrect page table level. This can cause iommu unmap operations to fail, potentially resulting in retries or warnings. The issue arises from infrequent page table level updates and a lack of synchronization on the read path. A seqcount has been implemented to enable lock-free read operations.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.