CVE-2026-64151: iommupt: Check for missing PAGE_SIZE in the pgsize_bitmap

Severity: high (CVSS 8.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-19 · updated 2026-08-17

Description

In the Linux kernel, the following vulnerability has been resolved: iommupt: Check for missing PAGE_SIZE in the pgsize_bitmap Sashiko pointed out that the driver could drop PAGE_SIZE from the pgsize_bitmap. That is technically allowed but nothing does it, and such an iommu_domain would not be used with the DMA API today. Still, it is against the design and it is trivial to fix up. Lift the PT_WARN_ON to the if branch and just skip the fast path.

Affected products

Linux kernel: from 6.19 before 7.0.11; 7.1-rc1, 7.1-rc2, 7.1-rc3 — fixed in 7.0.11

How to fix

Upgrade to a fixed version: Linux kernel 7.0.11. Check the vendor advisory for mitigations.

References

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