CVE-2025-37819 Information

Description

In the Linux kernel the following vulnerability has been resolved:

irqchip/gic-v2m: Prevent use after free of gicv2m_get_fwnode()

With ACPI in place gicv2m_get_fwnode() is registered with the pci subsystem as pci_msi_get_fwnode_cb() which may get invoked at runtime during a PCI host bridge probe. But the call back is wrongly marked as __init causing it to be freed while being registered with the PCI subsystem and could trigger:

Unable to handle kernel paging request at virtual address ffff8000816c0400 gicv2m_get_fwnode+0x0/0x58 (P) pci_set_bus_msi_domain+0x74/0x88 pci_register_host_bridge+0x194/0x548

This is easily reproducible on a Juno board with ACPI boot.

Retain the function for later use.

Reference

https://git.kernel.org/stable/c/2f2803e4b5e4df2b08d378deaab78b1681ef9b30 https://git.kernel.org/stable/c/3318dc299b072a0511d6dfd8367f3304fb6d9827 https://git.kernel.org/stable/c/3939d6f29d34cdb60e3f68b76e39e00a964a1d51 https://git.kernel.org/stable/c/47bee0081b483b077c7560bc5358ad101f89c8ef