CVE-2026-64151
kernel: iommupt: Check for missing PAGE_SIZE in the pgsize_bitmap
Severity
ModerateRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · July 19, 2026
Updated · August 19, 2026
Description
A flaw was found in the Linux kernel's IOMMU (Input/Output Memory Management Unit) page table driver. This vulnerability involves a missing check for the system's fundamental memory page size (PAGE_SIZE) within the pgsize_bitmap data structure. While an IOMMU configuration with this missing check would not typically be used with the Direct Memory Access (DMA) API, this design oversight could lead to unexpected system behavior or integrity issues.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.1 · 7.1CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
CWE-358 · Improperly Implemented Security Check for Standard