Threats Tagged 'cve-2026-53164'

In the Linux kernel, the following vulnerability has been resolved: iommu/dma: Do not try to iommu_map a 0 length region in swiotlb iommu_dma_iova_link_swiotlb() processes a mapping that is unaligned in three parts, the head, middle and trailer. If the middle is empty because there are no aligned pages it will call down to iommu_map() with a 0 size which the iommupt implementation will fail as illegal. It then tries to do an error unwind and starts from the wrong spot corrupting the mapping so the eventual destruction triggers a WARN_ON. Check for 0 length and avoid mapping and use offset not 0 as the starting point to unlink. This is frequently triggered by using some kinds of thunderbolt NVMe drives that trigger forced SWIOTLB for unaligned memory. NVMe seems to pass in oddly aligned buffers for the passthrough commands from smartctl that hit this condition.

A vulnerability in the Linux kernel's iommu/dma subsystem was fixed to prevent attempts to map zero-length memory regions in swiotlb. The issue occurs when iommu_dma_iova_link_swiotlb() processes an unaligned mapping in three parts and calls iommu_map() with a zero size, which is illegal and causes corruption leading to kernel warnings. This condition is often triggered by certain Thunderbolt NVMe drives using forced SWIOTLB with unaligned memory buffers, such as those from smartctl passthrough commands.