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Vulnerability record · CVE-2026-64151 · published 19 July 2026

CVE-2026-64151: Linux kernel vulnerability

Linux · Linux Kernel

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.

8.4 CVSS 3.1 High EPSS 0.16% · top 95.1%
8.4CVSS 3.1 base score
0.16%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
17 Aug 2026Last modified by NVD

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.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/00850f41da24423587abd6124a790dd4f12bcef3 Patch
https://git.kernel.org/stable/c/8ef3f77c440005c7f04229a75976bfc078364247 Patch

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Source: NIST National Vulnerability Database (record CVE-2026-64151), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.