CVE-2026-45879

Summary

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

power: supply: bq25980: 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/86f93dfb23f5bf4f285c4256a7e909d222f7de56
• https://git.kernel.org/stable/c/16875e3b7bc9e59bfa0acaf1e43f275a6f42a30f
• https://git.kernel.org/stable/c/0560a4b09c92e2ecaa883965cf6f9ca51c158ff9
• https://git.kernel.org/stable/c/0de95d29d847c6217b7d5845e24a71a4aee7b359
• https://git.kernel.org/stable/c/4aeaf03c17260415c2fdd55992f9ad4188d5455a
• https://git.kernel.org/stable/c/03d1e4ee4e6aa6d2966e883e4ca0e5be73bf1b7c
• https://git.kernel.org/stable/c/abea607ff2f62f4c0a5fb29f7fbdaaab163276a4
• https://git.kernel.org/stable/c/5f0b1cb41906e86b64bf69f5ededb83b0d757c27

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