CVE-2026-45938
published 2026-05-27CVE-2026-45938: In the Linux kernel, the following vulnerability has been resolved: power: supply: pm8916_lbc: Fix use-after-free in power_supply_changed() Using the `devm_`…
In the Linux kernel, the following vulnerability has been resolved:
power: supply: pm8916_lbc: 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
6 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| linux | linux | — | — |
| linux | linux | >= f8d7a3d21160a0cab4d15b81231f2a76b0fcee13 < dbe579e620ef0f53db490ec79a8566e4ea8918ac | dbe579e620ef0f53db490ec79a8566e4ea8918ac |
| linux | linux | >= f8d7a3d21160a0cab4d15b81231f2a76b0fcee13 < 08e674e9862a2db46fb234eb7c5442455ece0131 | 08e674e9862a2db46fb234eb7c5442455ece0131 |
| linux | linux | >= f8d7a3d21160a0cab4d15b81231f2a76b0fcee13 < d7d31fc99d248d5f47588f50dce5c7599c991c6a | d7d31fc99d248d5f47588f50dce5c7599c991c6a |
| linux | linux | >= f8d7a3d21160a0cab4d15b81231f2a76b0fcee13 < b7508129978ae1e2ed9b0410396abc05def9c4eb | b7508129978ae1e2ed9b0410396abc05def9c4eb |
| linux | linux_kernel | — | — |