CVE-2026-64280

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinuxfa8dda1edef9ebc3af467c644c5533ac97171e12 < 5352d488ce4ae5e8c68c080ad4c3a5f084ad5fbcaffected
LinuxLinuxfa8dda1edef9ebc3af467c644c5533ac97171e12 < d7e787eee2ea619b6dbb98890472ee73daf2e7fdaffected
LinuxLinuxfa8dda1edef9ebc3af467c644c5533ac97171e12 < a6a3884ff500f04f3088d6d09eec803cd35331a2affected
LinuxLinuxfa8dda1edef9ebc3af467c644c5533ac97171e12 < 16381bda90b261a656ded0568630c1b857b2ebc8affected
LinuxLinuxfa8dda1edef9ebc3af467c644c5533ac97171e12 < b50e6cd2395cde615f59b624819998d28c0668d6affected
LinuxLinuxfa8dda1edef9ebc3af467c644c5533ac97171e12 < 59070040fd12e0b78d7b4d341d9f9a183237c5ffaffected
LinuxLinuxfa8dda1edef9ebc3af467c644c5533ac97171e12 < fb2c0eab51ae5b02d2bae7d67c2cfbec39b57231affected
LinuxLinuxfa8dda1edef9ebc3af467c644c5533ac97171e12 < fc3b071a7c8dc0f5d56defddf6e6fd5aaa3e1e27affected
LinuxLinux4.19affected
LinuxLinux0 < 4.19unaffected
LinuxLinux5.10.266 <= 5.10.*unaffected
LinuxLinux5.15.217 <= 5.15.*unaffected
LinuxLinux6.1.184 <= 6.1.*unaffected
LinuxLinux6.6.148 <= 6.6.*unaffected
LinuxLinux6.12.101 <= 6.12.*unaffected
LinuxLinux6.18.39 <= 6.18.*unaffected
LinuxLinux7.1.4 <= 7.1.*unaffected
LinuxLinux7.2 <= *unaffected

Weaknesses

References