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Vulnerability record · CVE-2026-64280 · published 25 July 2026

CVE-2026-64280: Linux kernel vulnerability

Linux · Linux Kernel

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.

8.8 CVSS 3.1 High EPSS 0.17% · top 94.5%
8.8CVSS 3.1 base score
0.17%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
23 Aug 2026Last modified by NVD

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:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Source: NIST National Vulnerability Database (record CVE-2026-64280), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.