CVE-2026-46270
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…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.13%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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.
- CVSS 3.1
- 8.4 HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.13% probability · 3th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-416
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/2178dc65d45e2f7bcaa8af8d80d100419bdab251Patch
- https://git.kernel.org/stable/c/62d753b916bd500bb269b7078cdab73198ab4718Patch
- https://git.kernel.org/stable/c/64e15155095f39f4dec9b4659da1238ef8fc54d4Patch
- https://git.kernel.org/stable/c/721449a15170fc5f028a7576d7f65b9f60d53482Patch
- https://git.kernel.org/stable/c/a39f8f06216f73ef40e71e2fe4ad071964c1fd36Patch
- https://git.kernel.org/stable/c/af261f218a7606f93d2c786353d60bb4feb56ef0Patch
- https://git.kernel.org/stable/c/d4e2e3c3caa26b93aa9f36d0a6824b584e2a8dfcPatch
- https://git.kernel.org/stable/c/e2febe375e5ea5afed92f4cd9711bde8f24ee6d2Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.