CVE-2026-64280 fpga: dfl-afu: validate DMA mapping length in afu_dma_map_region()
A missing upper bound check in the Linux kernel FPGA driver allows integer truncation, potentially leading to denial of service or privilege escalation.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-64280?
CVE-2026-64280 is a high-severity vulnerability in Linux kernel, published on 25 Jul 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Which versions are affected by CVE-2026-64280?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-64280?
Apply the vendor's patch.
Is CVE-2026-64280 being exploited?
There is no known exploitation of CVE-2026-64280 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-64280, DEBIAN-CVE-2026-64280, GHSA-hj85-3f53-vrg4, ROOT-OS-DEBIAN-12-CVE-2026-64280, ROOT-OS-DEBIAN-13-CVE-2026-64280, ROOT-OS-UBUNTU-2204-CVE-2026-64280 and 1 more.