CVE-2026-64280

In the Linux kernel, the following vulnerability has been resolved: fpga: dfl-afu: validate DMA mapping length in afu_dma_map_region() afu_ioctl_dma_map() accepts a 64-bit length from userspace via DFL_FPGA_PORT_DMA_MAP ioctl without an upper bound check. The value is passed to afu_dma_pin_pages() where npages is derived as length >> PAGE_SHIFT and passed to pin_user_pages_fast() which takes int nr_pages, causing implicit truncation if length is very large. Validate map.length at the ioctl entry point before calling afu_dma_map_region(), rejecting values whose page count exceeds INT_MAX.

Score

CVSS 3.1 8.8 High

Status

Modified - 416baaa9-dc9f-4396-8d5f-8c081fb06d67

Published

2026-07-25

Last modified

2026-08-23

Affected products

• Linux Kernel (Linux)

References

• https://git.kernel.org/stable/c/16381bda90b261a656ded0568630c1b857b2ebc8
• https://git.kernel.org/stable/c/5352d488ce4ae5e8c68c080ad4c3a5f084ad5fbc
• https://git.kernel.org/stable/c/59070040fd12e0b78d7b4d341d9f9a183237c5ff
• https://git.kernel.org/stable/c/a6a3884ff500f04f3088d6d09eec803cd35331a2
• https://git.kernel.org/stable/c/b50e6cd2395cde615f59b624819998d28c0668d6
• https://git.kernel.org/stable/c/d7e787eee2ea619b6dbb98890472ee73daf2e7fd
• https://git.kernel.org/stable/c/fb2c0eab51ae5b02d2bae7d67c2cfbec39b57231
• https://git.kernel.org/stable/c/fc3b071a7c8dc0f5d56defddf6e6fd5aaa3e1e27