CVE-2025-37819: irqchip/gic-v2m: Prevent use after free of gicv2m_get_fwnode()

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-05-08 · updated 2026-06-17
Weakness: CWE-416

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.

Affected products

Debian Linux: 11.0
Linux kernel: from 4.5 before 5.4.294; from 5.5 before 5.10.238; from 5.11 before 5.15.182; from 5.16 before 6.1.138; from 6.2 before 6.6.89; from 6.7 before 6.12.26 — fixed in 5.10.238, 5.15.182, 5.4.294, 6.1.138, 6.12.26, 6.14.5

How to fix

Upgrade to a fixed version: Linux kernel 5.10.238, 5.15.182, 5.4.294, 6.1.138. Check the vendor advisory for mitigations.

References

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