CVE-2026-45902power: supply: bq256xx: Fix use-after-free in power_supply_changed()

Official description

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 packages & fixed versions

Affected products (as reported)

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