CVE-2026-45946

Summary

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.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/43cbb78ee047b9b12d096d40e3be265969d4c1f8
• https://git.kernel.org/stable/c/551672981fe227122258a25a385a05f5c0746ad6
• https://git.kernel.org/stable/c/f50433f2603def08b21a4bf2fd238687fb5cbde9
• https://git.kernel.org/stable/c/847eeb6c0efcd76c7def73857cf798a4fcd8f79b
• https://git.kernel.org/stable/c/709db4b476e254579d9c48ec34d397a41ca0c407
• https://git.kernel.org/stable/c/46dbda27b028d78087667e8280966b99cec015ca
• https://git.kernel.org/stable/c/c4af8a98bb52825a5331ae1d0604c0ea6956ba4b

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