CVE-2026-45936
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Use-After-Free in Linux Kernel Goldfish Power Supply

Publication date: 2026-05-27

Last updated on: 2026-05-27

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: power: supply: goldfish: 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.
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Meta Information
Published
2026-05-27
Last Modified
2026-05-27
Generated
2026-06-16
AI Q&A
2026-05-27
EPSS Evaluated
2026-06-15
NVD
CVE-2026-45936
EUVD
EUVD-2026-32220
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
linux_kernel power_supply *
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Exploitability
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KEV
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CWE ID Description
CWE-UNKNOWN
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Executive Summary

This vulnerability exists in the Linux kernel's power supply subsystem, specifically in the goldfish power supply driver. It is a use-after-free bug caused by the order in which resources are allocated and deallocated. The IRQ (interrupt request) handler is requested before the power_supply handle is allocated, which leads to a race condition during removal. An interrupt can occur after the power_supply handle has been freed but before the IRQ handler is unregistered, causing the IRQ handler to call power_supply_changed() with a freed handle. This can crash the system or corrupt memory.

Additionally, a similar issue can occur during the probe phase, where an interrupt might fire before the power_supply handle is registered, leading to the use of an uninitialized handle in power_supply_changed(). The fix involves requesting the IRQ only after the power_supply handle has been registered to prevent this race condition.

Impact Analysis

This vulnerability can cause system crashes or silent memory corruption due to the use of a freed or uninitialized power_supply handle in the interrupt handler. Such instability can lead to unexpected system behavior, potential data loss, or denial of service if the system becomes unresponsive or crashes frequently.

Mitigation Strategies

The vulnerability is caused by a race condition in the Linux kernel's power supply handling for the goldfish platform, where an interrupt handler may access a freed or uninitialized power_supply handle, leading to crashes or memory corruption.

To mitigate this vulnerability, ensure that the IRQ is requested only after the power_supply handle has been registered. This prevents the race condition by maintaining the correct allocation and deallocation order.

Practically, this means updating or patching your Linux kernel to include the fix where the IRQ request uses the devm_ variant after the power_supply handle registration, as described in the fix.

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