CVE-2026-45882: power: supply: pm8916_bms_vm: Fix use-after-free in power_supply_changed()
In the Linux kernel, the following vulnerability has been resolved:
power: supply: pm8916bmsvm: 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
Request the IRQ only after allocating and registering the power_supply handle, so the IRQ handler cannot run before the handle exists or after it has been freed.
Linux kernel power: supply: pm8916_bms_vm IRQ request order = after power_supply handle registration
Event History
Frequently Asked Questions
When can this race be triggered?
The race 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 likely impact if the race occurs?
The IRQ handler can call power_supply_changed() with a freed or uninitialized power_supply handle. This usually crashes the system or can silently corrupt memory.
What access does an attacker need to exploit this issue?
The supplied severity vector identifies local attack vector and low privileges, with no user interaction required. The description does not provide further exploitation prerequisites or attack steps.
Which systems are exposed?
Systems using the Linux kernel pm8916_bms_vm power-supply driver are relevant. The issue depends on interrupts occurring during the driver's probe or removal timing windows.