High severity · published Jul 25, 2026
CVE-2026-64280
fpga: dfl-afu: validate DMA mapping length in afu_dma_map_region()
8.8
CVSS
0.2%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 6% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
KE
Kernel · Linux
4.19 before 6.6.148; 6.7 before 6.12.101; 6.13 before 6.18.39; 6.19 before 7.1.4 · source: NVD
LI
Linux · Linux
fa8dda1edef9ebc3af467c644c5533ac97171e12 before 5352d488ce4ae5e8c68c080ad4c3a5f084ad5fbc; fa8dda1edef9ebc3af467c644c5533ac97171e12 before d7e787eee2ea619b6dbb98890472ee73daf2e7fd; fa8dda1edef9ebc3af467c644c5533ac97171e12 before a6a3884ff500f04f3088d6d09eec803cd35331a2; fa8dda1edef9ebc3af467c644c5533ac97171e12 before 16381bda90b261a656ded0568630c1b857b2ebc8; fa8dda1edef9ebc3af467c644c5533ac97171e12 before b50e6cd2395cde615f59b624819998d28c0668d6; fa8dda1edef9ebc3af467c644c5533ac97171e12 before 59070040fd12e0b78d7b4d341d9f9a183237c5ff; +3 more · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-64280
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-64280
Patch
https://git.kernel.org/stable/c/16381bda90b261a656ded0568630c1b857b2ebc8
git.kernel.org
https://git.kernel.org/stable/c/5352d488ce4ae5e8c68c080ad4c3a5f084ad5fbc
Patch
https://git.kernel.org/stable/c/59070040fd12e0b78d7b4d341d9f9a183237c5ff
git.kernel.org
https://git.kernel.org/stable/c/a6a3884ff500f04f3088d6d09eec803cd35331a2
Patch
https://git.kernel.org/stable/c/b50e6cd2395cde615f59b624819998d28c0668d6
git.kernel.org
https://git.kernel.org/stable/c/d7e787eee2ea619b6dbb98890472ee73daf2e7fd
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