CVE-2026-45938: power: supply: pm8916_lbc: Fix use-after-free in power_supply_changed()
In the Linux kernel, the following vulnerability has been resolved:
power: supply: pm8916lbc: Fix use-after-free in powersupplychanged()
Using the devm variant for requesting IRQ before the devm variant for allocating/registering the powersupply handle, means that the powersupply 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 powersupply handle has been freed, but just before the corresponding unregistration of the IRQ handler has run.
This will lead to the IRQ handler calling powersupplychanged() with a freed powersupply handle. Which usually crashes the system or otherwise silently corrupts the memory...
Note that there is a similar situation which can also happen during probe(); the possibility of an interrupt firing before registering the powersupply handle. This would then lead to the nasty situation of using the powersupply handle uninitialized in powersupplychanged().
Fix this racy use-after-free by making sure the IRQ is requested after the registration of the powersupply 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
Change probe/resource allocation order so the power_supply handle is allocated and registered before requesting the IRQ; this also ensures the IRQ handler is unregistered before the power_supply handle is deallocated during removal.
Linux kernel power: supply: pm8916_lbc IRQ request order = Request the IRQ after registering the power_supply handle
Event History
Frequently Asked Questions
When can the race be triggered?
It can occur during device removal if an interrupt fires after the power_supply handle has been freed but before the IRQ handler is unregistered. A similar race can occur during probe if an interrupt fires before the power_supply handle is registered.
What is the impact if the race occurs?
The IRQ handler can call power_supply_changed() with a freed or uninitialized power_supply handle. This can crash the system or silently corrupt memory.
What conditions are needed for exploitation?
An attacker needs local access with low privileges, as reflected by the AV:L and PR:L vector. The vulnerable timing also requires an interrupt to fire during the affected probe or removal windows.