CVE-2026-45885
In the Linux kernel, the following vulnerability has been resolved: power: supply: cpcap-battery: 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 (0.16%). 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: cpcap-battery: 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
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.16% probability · 6th 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/2841bbb5a35c4449c0a0458e8e476b2a62f95147Patch
- https://git.kernel.org/stable/c/2ce2334be155bd8bad6377e99984246ce4dbd08cPatch
- https://git.kernel.org/stable/c/3ff75cba1c98349a23a8f9333981deba1972cc11Patch
- https://git.kernel.org/stable/c/642f33e34b969eedec334738fd5df95d2dc42742Patch
- https://git.kernel.org/stable/c/c549dd3de4b3f6e726d1b8386d40ccf7d3abdbe4Patch
- https://git.kernel.org/stable/c/cbb9b07f88a9ef6518934c41eb3e8cf840d657d5Patch
- https://git.kernel.org/stable/c/e261be6f18929f2397cd54cd583a2df624c129c1Patch
- https://git.kernel.org/stable/c/f3fbe309c9bfe1aac1e2b26543e9dc4829f3275aPatch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.