CVE-2026-45867

Summary

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.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/f2a0777b1e5a3cee1712c4d3e9095c0df8fc8cb3
• https://git.kernel.org/stable/c/0768e8525a46df103647ca5059b32320d7fd17e4
• https://git.kernel.org/stable/c/d023ef9f748b2090f7a9dbdd5c622b6ad99088ea
• https://git.kernel.org/stable/c/697bb5dc0cb4791e244f3970b067bc1ef33be9d9
• https://git.kernel.org/stable/c/76a42ba547a9b2e2337894f67a4d9247445007d5
• https://git.kernel.org/stable/c/f27eb76def5c07e4d7cc468b40741f19dafc83ce
• https://git.kernel.org/stable/c/83c1bd466c514cb24ca6ef347c5aac76a13c4e1e
• https://git.kernel.org/stable/c/3291c51d4684d048dd2eb91b5b65fcfdaf72141f

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