CVE-2026-64151 is a vulnerability in Linux Kernel
Published on July 19, 2026
iommupt: Check for missing PAGE_SIZE in the pgsize_bitmap
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.
Products Associated with CVE-2026-64151
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Affected Versions
Linux:- Version dcd6a011a8d523a114af2360a8753de5bd60c139 and below 00850f41da24423587abd6124a790dd4f12bcef3 is affected.
- Version dcd6a011a8d523a114af2360a8753de5bd60c139 and below 8ef3f77c440005c7f04229a75976bfc078364247 is affected.
- Version 6.19 is affected.
- Before 6.19 is unaffected.
- Version 7.0.11, <= 7.0.* is unaffected.
- Version 7.1, <= * is unaffected.