CVE-2025-40076 – PCI: rcar-host: Pass proper IRQ domain to generic_handle_domain_irq()

CVE ID : CVE-2025-40076

Published : Oct. 28, 2025, 12:15 p.m. | 29 minutes ago

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.

Severity: 0.0 | NA

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