CVE-2026-45916

Summary

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.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/ca7dd71773e4e050b0fb98768b7eae60f8d1f38b
• https://git.kernel.org/stable/c/f1f472b14ad56104ba228b8fbec60d5b21829913
• https://git.kernel.org/stable/c/8010b745b436c3e1ca5dd960aa29fa3e0f6d8841
• https://git.kernel.org/stable/c/2078830c32d1e49ac942c6f8c21f35c806ae5e94
• https://git.kernel.org/stable/c/82d3eb97a976c9d56bb92b241397610e57a9c629
• https://git.kernel.org/stable/c/861dda7a9074c0ff67788928165ae39d7f647491
• https://git.kernel.org/stable/c/14d4dee5d8fb361bfff275832087254beab66d72
• https://git.kernel.org/stable/c/8d59cf3887fbabacef53bfba473e33e8a8d9d07b

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