🛡️ CVE-2026-45946 — kernel

power: supply: ab8500: Fix use-after-free in power_supply_changed()

In the Linux kernel, the following vulnerability has been resolved:

power: supply: ab8500: Fix use-after-free in power_supply_changed()

Using the devm_ variant for requesting IRQ _before_ the devm_

variant for allocating/registering the power_supply handle, means that

the power_supply 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 power_supply

handle has been freed, *but* just _before_ the corresponding

unregistration of the IRQ handler has run.

This will lead to the IRQ handler calling power_supply_changed() with

a freed power_supply 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 power_supply handle. This would then lead to the nasty situation

of using the power_supply handle *uninitialized* in

power_supply_changed().

Commit 1c1f13a006ed ("power: supply: ab8500: Move to componentized

binding") introduced this issue during a refactorization. Fix this racy

use-after-free by making sure the IRQ is requested _after_ the

registration of the power_supply handle.