Bug 2365032 (CVE-2025-37819)

Summary: CVE-2025-37819 kernel: Linux kernel: irqchip/gic-v2m use-after-free vulnerability
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's irqchip/gic-v2m component. This vulnerability allows a use-after-free condition via gicv2m_get_fwnode() being wrongly marked as __init, causing it to be freed while still registered with the PCI (Peripheral Component Interconnect) subsystem during a PCI host bridge probe.
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Description OSIDB Bzimport 2025-05-08 07:02:26 UTC 
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.
Comment 1 Avinash Hanwate 2025-05-08 10:16:42 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025050820-CVE-2025-37819-a3b9@gregkh/T