CVE-2026-45867
published 2026-05-27CVE-2026-45867: In the Linux kernel, the following vulnerability has been resolved: power: supply: act8945a: Fix use-after-free in power_supply_changed() Using the `devm_`…
In the Linux kernel, the following vulnerability has been resolved:
power: supply: act8945a: 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
10 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| linux | linux | — | — |
| linux | linux | >= a09209acd6a808794bdd7866af3678d1fd1d90e7 < f2a0777b1e5a3cee1712c4d3e9095c0df8fc8cb3 | f2a0777b1e5a3cee1712c4d3e9095c0df8fc8cb3 |
| linux | linux | >= a09209acd6a808794bdd7866af3678d1fd1d90e7 < 0768e8525a46df103647ca5059b32320d7fd17e4 | 0768e8525a46df103647ca5059b32320d7fd17e4 |
| linux | linux | >= a09209acd6a808794bdd7866af3678d1fd1d90e7 < d023ef9f748b2090f7a9dbdd5c622b6ad99088ea | d023ef9f748b2090f7a9dbdd5c622b6ad99088ea |
| linux | linux | >= a09209acd6a808794bdd7866af3678d1fd1d90e7 < 697bb5dc0cb4791e244f3970b067bc1ef33be9d9 | 697bb5dc0cb4791e244f3970b067bc1ef33be9d9 |
| linux | linux | >= a09209acd6a808794bdd7866af3678d1fd1d90e7 < 76a42ba547a9b2e2337894f67a4d9247445007d5 | 76a42ba547a9b2e2337894f67a4d9247445007d5 |
| linux | linux | >= a09209acd6a808794bdd7866af3678d1fd1d90e7 < f27eb76def5c07e4d7cc468b40741f19dafc83ce | f27eb76def5c07e4d7cc468b40741f19dafc83ce |
| linux | linux | >= a09209acd6a808794bdd7866af3678d1fd1d90e7 < 83c1bd466c514cb24ca6ef347c5aac76a13c4e1e | 83c1bd466c514cb24ca6ef347c5aac76a13c4e1e |
| linux | linux | >= a09209acd6a808794bdd7866af3678d1fd1d90e7 < 3291c51d4684d048dd2eb91b5b65fcfdaf72141f | 3291c51d4684d048dd2eb91b5b65fcfdaf72141f |
| linux | linux_kernel | — | — |