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

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

[Greg Kroah-Hartman]

From: Greg Kroah-Hartman <gregkh@kernel.org>

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.

The Linux kernel CVE team has assigned CVE-2026-64151 to this issue.


Affected and fixed versions
===========================

	Issue introduced in 6.19 with commit dcd6a011a8d523a114af2360a8753de5bd60c139 and fixed in 7.0.11 with commit 00850f41da24423587abd6124a790dd4f12bcef3
	Issue introduced in 6.19 with commit dcd6a011a8d523a114af2360a8753de5bd60c139 and fixed in 7.1 with commit 8ef3f77c440005c7f04229a75976bfc078364247

Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.

Unaffected versions might change over time as fixes are backported to
older supported kernel versions.  The official CVE entry at
	https://cve.org/CVERecord/?id=CVE-2026-64151
will be updated if fixes are backported, please check that for the most
up to date information about this issue.


Affected files
==============

The file(s) affected by this issue are:
	drivers/iommu/generic_pt/iommu_pt.h


Mitigation
==========

The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes.  Individual
changes are never tested alone, but rather are part of a larger kernel
release.  Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all.  If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
	https://git.kernel.org/stable/c/00850f41da24423587abd6124a790dd4f12bcef3
	https://git.kernel.org/stable/c/8ef3f77c440005c7f04229a75976bfc078364247