linux-cve-announce - CVE-2025-38216: iommu/vt-d: Restore context entry setup order for aliased devices

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Message-ID: <2025070423-CVE-2025-38216-7786@gregkh>
Date: Fri,  4 Jul 2025 15:37:45 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-38216: iommu/vt-d: Restore context entry setup order for aliased devices

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

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

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

iommu/vt-d: Restore context entry setup order for aliased devices

Commit 2031c469f816 ("iommu/vt-d: Add support for static identity domain")
changed the context entry setup during domain attachment from a
set-and-check policy to a clear-and-reset approach. This inadvertently
introduced a regression affecting PCI aliased devices behind PCIe-to-PCI
bridges.

Specifically, keyboard and touchpad stopped working on several Apple
Macbooks with below messages:

 kernel: platform pxa2xx-spi.3: Adding to iommu group 20
 kernel: input: Apple SPI Keyboard as
 /devices/pci0000:00/0000:00:1e.3/pxa2xx-spi.3/spi_master/spi2/spi-APP000D:00/input/input0
 kernel: DMAR: DRHD: handling fault status reg 3
 kernel: DMAR: [DMA Read NO_PASID] Request device [00:1e.3] fault addr
 0xffffa000 [fault reason 0x06] PTE Read access is not set
 kernel: DMAR: DRHD: handling fault status reg 3
 kernel: DMAR: [DMA Read NO_PASID] Request device [00:1e.3] fault addr
 0xffffa000 [fault reason 0x06] PTE Read access is not set
 kernel: applespi spi-APP000D:00: Error writing to device: 01 0e 00 00
 kernel: DMAR: DRHD: handling fault status reg 3
 kernel: DMAR: [DMA Read NO_PASID] Request device [00:1e.3] fault addr
 0xffffa000 [fault reason 0x06] PTE Read access is not set
 kernel: DMAR: DRHD: handling fault status reg 3
 kernel: applespi spi-APP000D:00: Error writing to device: 01 0e 00 00

Fix this by restoring the previous context setup order.

The Linux kernel CVE team has assigned CVE-2025-38216 to this issue.


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

	Issue introduced in 6.12 with commit 2031c469f8161abe74189cb74f50da224f340b71 and fixed in 6.12.35 with commit fb5873b779dd5858123c19bbd6959566771e2e83
	Issue introduced in 6.12 with commit 2031c469f8161abe74189cb74f50da224f340b71 and fixed in 6.15.4 with commit d43c81b691813e16a2d08208ce8947aebdab83cd
	Issue introduced in 6.12 with commit 2031c469f8161abe74189cb74f50da224f340b71 and fixed in 6.16-rc1 with commit 320302baed05c6456164652541f23d2a96522c06

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-2025-38216
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/intel/iommu.c
	drivers/iommu/intel/iommu.h
	drivers/iommu/intel/nested.c


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/fb5873b779dd5858123c19bbd6959566771e2e83
	https://git.kernel.org/stable/c/d43c81b691813e16a2d08208ce8947aebdab83cd
	https://git.kernel.org/stable/c/320302baed05c6456164652541f23d2a96522c06