CVE-2026-45867

Description

In the Linux kernel, the following vulnerability has been resolved: power: supply: act8945a: 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()`. Fix this racy use-after-free by making sure the IRQ is requested _after_ the registration of the `power_supply` handle.

References

• https://git.kernel.org/stable/c/0768e8525a46df103647ca5059b32320d7fd17e4
• https://git.kernel.org/stable/c/3291c51d4684d048dd2eb91b5b65fcfdaf72141f
• https://git.kernel.org/stable/c/697bb5dc0cb4791e244f3970b067bc1ef33be9d9
• https://git.kernel.org/stable/c/76a42ba547a9b2e2337894f67a4d9247445007d5
• https://git.kernel.org/stable/c/83c1bd466c514cb24ca6ef347c5aac76a13c4e1e