Linux kernel rt9455 PAU-FREE: power_supply_changed()
CVE-2026-46270 Published on June 3, 2026
power: supply: rt9455: Fix use-after-free in power_supply_changed()
In the Linux kernel, the following vulnerability has been resolved:
power: supply: rt9455: 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.
Products Associated with CVE-2026-46270
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Affected Versions
Linux:- Version e86d69dd786e94046b8f5be7df1b9a8226a40b2a and below d4e2e3c3caa26b93aa9f36d0a6824b584e2a8dfc is affected.
- Version e86d69dd786e94046b8f5be7df1b9a8226a40b2a and below 62d753b916bd500bb269b7078cdab73198ab4718 is affected.
- Version e86d69dd786e94046b8f5be7df1b9a8226a40b2a and below a39f8f06216f73ef40e71e2fe4ad071964c1fd36 is affected.
- Version e86d69dd786e94046b8f5be7df1b9a8226a40b2a and below af261f218a7606f93d2c786353d60bb4feb56ef0 is affected.
- Version e86d69dd786e94046b8f5be7df1b9a8226a40b2a and below 2178dc65d45e2f7bcaa8af8d80d100419bdab251 is affected.
- Version e86d69dd786e94046b8f5be7df1b9a8226a40b2a and below 64e15155095f39f4dec9b4659da1238ef8fc54d4 is affected.
- Version e86d69dd786e94046b8f5be7df1b9a8226a40b2a and below 721449a15170fc5f028a7576d7f65b9f60d53482 is affected.
- Version e86d69dd786e94046b8f5be7df1b9a8226a40b2a and below e2febe375e5ea5afed92f4cd9711bde8f24ee6d2 is affected.
- Version 4.2 is affected.
- Before 4.2 is unaffected.
- Version 5.10.252, <= 5.10.* is unaffected.
- Version 5.15.202, <= 5.15.* is unaffected.
- Version 6.1.165, <= 6.1.* is unaffected.
- Version 6.6.128, <= 6.6.* is unaffected.
- Version 6.12.75, <= 6.12.* is unaffected.
- Version 6.18.14, <= 6.18.* is unaffected.
- Version 6.19.4, <= 6.19.* is unaffected.
- Version 7.0, <= * is unaffected.