Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 4.19, < 6.6.148 |
References
- https://git.kernel.org/stable/c/16381bda90b261a656ded0568630c1b857b2ebc8Patch
- https://git.kernel.org/stable/c/59070040fd12e0b78d7b4d341d9f9a183237c5ffPatch
- https://git.kernel.org/stable/c/b50e6cd2395cde615f59b624819998d28c0668d6Patch
- https://git.kernel.org/stable/c/fb2c0eab51ae5b02d2bae7d67c2cfbec39b57231Patch
- https://git.kernel.org/stable/c/fc3b071a7c8dc0f5d56defddf6e6fd5aaa3e1e27Patch
FAQ
What is CVE-2026-64280?
CVE-2026-64280 is a vulnerability with a CVSS score of 8.8 (HIGH). 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 ...
How severe is CVE-2026-64280?
CVE-2026-64280 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-64280?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.