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.
Affected versions
Linux kernel versions
4.19
and later are affected. Fixed in
6.18.39,
7.1.4,
7.2-rc1
and their respective stable series.
References
3 totalFrequently asked questions
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What is CVE-2026-64280?
CVE-2026-64280 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 4.19 onward and has been patched in 6.18.39, 7.1.4 and 7.2-rc1. CVE-2026-64280 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2026-64280?
Yes. CVE-2026-64280 has been patched. Fixed versions include 6.18.39, 7.1.4 and 7.2-rc1. If you are running Linux kernel 4.19 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-64280 actively exploited?
No. CVE-2026-64280 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.