Bug 2419931 (CVE-2025-40296)

Summary: CVE-2025-40296 kernel: platform/x86: int3472: Fix double free of GPIO device during unregister
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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OS: Linux   
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Description OSIDB Bzimport 2025-12-08 07:09:40 UTC 
In the Linux kernel, the following vulnerability has been resolved:

platform/x86: int3472: Fix double free of GPIO device during unregister

regulator_unregister() already frees the associated GPIO device. On
ThinkPad X9 (Lunar Lake), this causes a double free issue that leads to
random failures when other drivers (typically Intel THC) attempt to
allocate interrupts. The root cause is that the reference count of the
pinctrl_intel_platform module unexpectedly drops to zero when this
driver defers its probe.

This behavior can also be reproduced by unloading the module directly.

Fix the issue by removing the redundant release of the GPIO device
during regulator unregistration.
Comment 1 Jon Moroney 2025-12-08 18:48:24 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025120818-CVE-2025-40296-0769@gregkh/T