CVE-2026-64590

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

Description An issue exists in the dma-buf/udmabuf component where importing a udmabuf into a DRM driver triggers a spurious cacheline tracking warning when CONFIG DMA API DEBUG SG is enabled. This occurs because udmabuf builds a per-page scatter-gather list via sg set folio(). When begin cpu udmabuf() has already created a mapped sg table for the misc device and an importer maps the same pages via map udmabuf(), the DMA debug infrastructure detects overlapping physical addresses sharing cacheline boundaries. The issue involves the dma map sgtable() and dma unmap sgtable() functions, which fail to use the DMA ATTR SKIP CPU SYNC flag, leading to redundant CPU synchronization and the EEXIST warning in add dma entry().

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