linux-cve-announce - CVE-2025-40076: PCI: rcar-host: Pass proper IRQ domain to generic_handle_domain

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Message-ID: <2025102819-CVE-2025-40076-c787@gregkh>
Date: Tue, 28 Oct 2025 12:48:53 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-40076: PCI: rcar-host: Pass proper IRQ domain to generic_handle_domain_irq()

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

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

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

PCI: rcar-host: Pass proper IRQ domain to generic_handle_domain_irq()

Starting with commit dd26c1a23fd5 ("PCI: rcar-host: Switch to
msi_create_parent_irq_domain()"), the MSI parent IRQ domain is NULL because
the object of type struct irq_domain_info passed to:

msi_create_parent_irq_domain() ->
  irq_domain_instantiate()() ->
    __irq_domain_instantiate()

has no reference to the parent IRQ domain. Using msi->domain->parent as an
argument for generic_handle_domain_irq() leads to below error:

	"Unable to handle kernel NULL pointer dereference at virtual address"

This error was identified while switching the upcoming RZ/G3S PCIe host
controller driver to msi_create_parent_irq_domain() (which was using a
similar pattern to handle MSIs (see link section)), but it was not tested
on hardware using the pcie-rcar-host controller driver due to lack of
hardware.

[mani: reworded subject and description]

The Linux kernel CVE team has assigned CVE-2025-40076 to this issue.


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

	Issue introduced in 6.17 with commit dd26c1a23fd5a607c50738ea0dcb6cdbb8185cfe and fixed in 6.17.3 with commit e8e21aaf5d34015901cd271053a67a62b4204526
	Issue introduced in 6.17 with commit dd26c1a23fd5a607c50738ea0dcb6cdbb8185cfe and fixed in 6.18-rc1 with commit d3fee10e40a938331e2aae34348691136db31304

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-2025-40076
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/pci/controller/pcie-rcar-host.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/e8e21aaf5d34015901cd271053a67a62b4204526
	https://git.kernel.org/stable/c/d3fee10e40a938331e2aae34348691136db31304