CVE-2026-45916

Description

In the Linux kernel, the following vulnerability has been resolved: power: supply: sbs-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. Keep the old behavior of just printing a warning in case of any failures during the IRQ request and finishing the probe successfully.

References

• https://git.kernel.org/stable/c/14d4dee5d8fb361bfff275832087254beab66d72
• https://git.kernel.org/stable/c/2078830c32d1e49ac942c6f8c21f35c806ae5e94
• https://git.kernel.org/stable/c/8010b745b436c3e1ca5dd960aa29fa3e0f6d8841
• https://git.kernel.org/stable/c/82d3eb97a976c9d56bb92b241397610e57a9c629
• https://git.kernel.org/stable/c/861dda7a9074c0ff67788928165ae39d7f647491