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CVE-2026-64280: fpga: dfl-afu: validate DMA mapping length in afu_dma_map_region()

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-25 · updated 2026-08-23

Description

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.

Affected products

• Linux kernel: from 4.19 before 6.6.148; from 6.7 before 6.12.101; from 6.13 before 6.18.39; from 6.19 before 7.1.4 — fixed in 6.12.101, 6.18.39, 6.6.148, 7.1.4

How to fix

Upgrade to a fixed version: Linux kernel 6.12.101, 6.18.39, 6.6.148, 7.1.4. Check the vendor advisory for mitigations.

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

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