linux-cve-announce - CVE-2025-37900: iommu: Fix two issues in iommu_copy_struct_from

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Message-ID: <2025052055-CVE-2025-37900-717c@gregkh>
Date: Tue, 20 May 2025 17:21:57 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-37900: iommu: Fix two issues in iommu_copy_struct_from_user()

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

Description
===========

In the Linux kernel, the following vulnerability has been resolved:

iommu: Fix two issues in iommu_copy_struct_from_user()

In the review for iommu_copy_struct_to_user() helper, Matt pointed out that
a NULL pointer should be rejected prior to dereferencing it:
https://lore.kernel.org/all/86881827-8E2D-461C-BDA3-FA8FD14C343C@nvidia.com

And Alok pointed out a typo at the same time:
https://lore.kernel.org/all/480536af-6830-43ce-a327-adbd13dc3f1d@oracle.com

Since both issues were copied from iommu_copy_struct_from_user(), fix them
first in the current header.

The Linux kernel CVE team has assigned CVE-2025-37900 to this issue.


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

	Issue introduced in 6.7 with commit e9d36c07bb787840e4813fb09a929a17d522a69f and fixed in 6.12.28 with commit 2e303d010722787dc84d94f68d70fe10dfc1b9ea
	Issue introduced in 6.7 with commit e9d36c07bb787840e4813fb09a929a17d522a69f and fixed in 6.14.6 with commit 967d6f0d9a20a1bf15ee7ed881e2d4e532e22709
	Issue introduced in 6.7 with commit e9d36c07bb787840e4813fb09a929a17d522a69f and fixed in 6.15-rc5 with commit 30a3f2f3e4bd6335b727c83c08a982d969752bc1

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-2025-37900
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:
	include/linux/iommu.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/2e303d010722787dc84d94f68d70fe10dfc1b9ea
	https://git.kernel.org/stable/c/967d6f0d9a20a1bf15ee7ed881e2d4e532e22709
	https://git.kernel.org/stable/c/30a3f2f3e4bd6335b727c83c08a982d969752bc1