Instituto Nacional de ciberseguridad. Sección Incibe
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CVE-2026-64280

Severity CVSS v4.0:
Pending analysis
Type:
Unavailable / Other
Publication date:
25/07/2026
Last modified:
03/08/2026

Description

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> fpga: dfl-afu: validate DMA mapping length in afu_dma_map_region()<br /> <br /> afu_ioctl_dma_map() accepts a 64-bit length from userspace via<br /> DFL_FPGA_PORT_DMA_MAP ioctl without an upper bound check. The value<br /> is passed to afu_dma_pin_pages() where npages is derived as<br /> length &gt;&gt; PAGE_SHIFT and passed to pin_user_pages_fast() which takes<br /> int nr_pages, causing implicit truncation if length is very large.<br /> <br /> Validate map.length at the ioctl entry point before calling<br /> afu_dma_map_region(), rejecting values whose page count exceeds<br /> INT_MAX.

Impact

Vector 3.x
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H CVSS v3.1 Severity and Metrics:

Base Score: 8.80 HIGH
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Changed
Confidentiality (C): High
Integrity (I): High
Availability (A): High

Base Score 3.x
8.80
Severity 3.x
HIGH

References to Advisories, Solutions, and Tools