CVE-2026-45936

Summary

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

power: supply: goldfish: 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/589d4fe56713c6344cd9f8939f9c7621c85f0966
• https://git.kernel.org/stable/c/bad8b61eb5059acd88349680e47839342dc89e94
• https://git.kernel.org/stable/c/33751e28842bf5aee5ef7b2b8d5e456a069095cb
• https://git.kernel.org/stable/c/77ea437faa4c06362e3ecfd2d7264eaa7ac1e82c
• https://git.kernel.org/stable/c/4350505e82b4f972ddb788e1c712c557c38859d0
• https://git.kernel.org/stable/c/8c89aade8335e26a6a7dcda18992d15f51943927
• https://git.kernel.org/stable/c/0b29ffe4090a3fc7a7649de20e1eb1e53adddac7
• https://git.kernel.org/stable/c/b2ce982e2e0c888dc55c888ad0e20ea04daf2e6b

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