CVE-2026-45885

Summary

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

power: supply: cpcap-battery: 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/c549dd3de4b3f6e726d1b8386d40ccf7d3abdbe4
• https://git.kernel.org/stable/c/3ff75cba1c98349a23a8f9333981deba1972cc11
• https://git.kernel.org/stable/c/2ce2334be155bd8bad6377e99984246ce4dbd08c
• https://git.kernel.org/stable/c/cbb9b07f88a9ef6518934c41eb3e8cf840d657d5
• https://git.kernel.org/stable/c/f3fbe309c9bfe1aac1e2b26543e9dc4829f3275a
• https://git.kernel.org/stable/c/2841bbb5a35c4449c0a0458e8e476b2a62f95147
• https://git.kernel.org/stable/c/e261be6f18929f2397cd54cd583a2df624c129c1
• https://git.kernel.org/stable/c/642f33e34b969eedec334738fd5df95d2dc42742

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