CVE-2026-45902
published 2026-05-27CVE-2026-45902: In the Linux kernel, the following vulnerability has been resolved: power: supply: bq256xx: Fix use-after-free in power_supply_changed() Using the `devm_`…
In the Linux kernel, the following vulnerability has been resolved:
power: supply: bq256xx: 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
9 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| linux | linux | — | — |
| linux | linux | >= 32e4978bb920d047fe5de3ea42d176f267c01f63 < 81d3688c9a2158329391e08f2d0b8ba204216044 | 81d3688c9a2158329391e08f2d0b8ba204216044 |
| linux | linux | >= 32e4978bb920d047fe5de3ea42d176f267c01f63 < 74b5a88318db97d51bb40f774736553c2acd1514 | 74b5a88318db97d51bb40f774736553c2acd1514 |
| linux | linux | >= 32e4978bb920d047fe5de3ea42d176f267c01f63 < cb5c743936edcebc51880eeb6bf04979b5c9438b | cb5c743936edcebc51880eeb6bf04979b5c9438b |
| linux | linux | >= 32e4978bb920d047fe5de3ea42d176f267c01f63 < 83c27fdd696ac13d023ef7a0345301be93209c53 | 83c27fdd696ac13d023ef7a0345301be93209c53 |
| linux | linux | >= 32e4978bb920d047fe5de3ea42d176f267c01f63 < 4b6fb0b6124f558131e502e3ffd03e6583b3ace6 | 4b6fb0b6124f558131e502e3ffd03e6583b3ace6 |
| linux | linux | >= 32e4978bb920d047fe5de3ea42d176f267c01f63 < 8796910131a32ff29275052df768ef022929a394 | 8796910131a32ff29275052df768ef022929a394 |
| linux | linux | >= 32e4978bb920d047fe5de3ea42d176f267c01f63 < 8005843369723d9c8975b7c4202d1b85d6125302 | 8005843369723d9c8975b7c4202d1b85d6125302 |
| linux | linux_kernel | — | — |