CVE-2026-45902

Summary

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

power: supply: bq256xx: 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/81d3688c9a2158329391e08f2d0b8ba204216044
• https://git.kernel.org/stable/c/74b5a88318db97d51bb40f774736553c2acd1514
• https://git.kernel.org/stable/c/cb5c743936edcebc51880eeb6bf04979b5c9438b
• https://git.kernel.org/stable/c/83c27fdd696ac13d023ef7a0345301be93209c53
• https://git.kernel.org/stable/c/4b6fb0b6124f558131e502e3ffd03e6583b3ace6
• https://git.kernel.org/stable/c/8796910131a32ff29275052df768ef022929a394
• https://git.kernel.org/stable/c/8005843369723d9c8975b7c4202d1b85d6125302

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