CVE-2026-46246: power: supply: pm8916_lbc: Fix use-after-free for extcon in IRQ handler
In the Linux kernel, the following vulnerability has been resolved:
power: supply: pm8916lbc: Fix use-after-free for extcon in IRQ handler
Using the devm variant for requesting IRQ before the devm variant for allocating/registering the extcon handle, means that the extcon handle will be deallocated/unregistered before the interrupt handler (since devm naturally deallocates in reverse allocation order). This means that during removal, there is a race condition where an interrupt can fire just after the extcon handle has been freed, but just before the corresponding unregistration of the IRQ handler has run.
This will lead to the IRQ handler calling extconsetstatesync() with a freed extcon handle. Which usually crashes the system or otherwise silently corrupts the memory...
Fix this racy use-after-free by making sure the IRQ is requested after the registration of the extcon handle.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
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ubuntu/linux-gcp-fipsto a version that resolves this vulnerability.Fixed in 6.8.0-1063.69+fips1 - Configuration
Register/allocate the extcon handle before requesting the IRQ so devm-managed cleanup unregisters the IRQ before deallocating the extcon handle.
Linux kernel power supply pm8916_lbc IRQ and extcon registration order = Request the IRQ after registering the extcon handle
Event History
Frequently Asked Questions
When can this vulnerability be triggered?
It can be triggered during removal of the affected driver, if an interrupt fires after the extcon handle has been freed or unregistered but before the IRQ handler has been unregistered.
What level of access does an attacker need?
The supplied severity vector identifies the attack vector as local and requires low privileges. No user interaction is required.
What is the likely impact if the race occurs?
The IRQ handler can call extcon_set_state_sync() with a freed extcon handle. This can crash the system or silently corrupt memory, with high impacts to confidentiality, integrity, and availability according to the supplied vector.
What change resolves the issue?
The fix ensures that the extcon handle is allocated and registered before the IRQ is requested. This causes IRQ cleanup to occur before extcon cleanup during driver removal, preventing the handler from accessing the freed handle.