CVE-2026-45867
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Use-After-Free in Linux Kernel power_supply act8945a Driver

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: act8945a: 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
2026-05-28
EPSS Evaluated
2026-06-15
NVD
CVE-2026-45867
EUVD
EUVD-2026-32333
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *
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Exploitability
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CWE ID Description
CWE-UNKNOWN
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Compliance Impact

The provided information does not include any details about the impact of this vulnerability on compliance with common standards and regulations such as GDPR or HIPAA.

Executive Summary

This vulnerability is a use-after-free issue in the Linux kernel's power supply driver for the act8945a device. It occurs because the interrupt request (IRQ) is requested before the power_supply handle is allocated and registered. Since the devm_ functions deallocate resources in reverse order, the power_supply handle can be freed before the IRQ handler is unregistered during device removal.

This creates a race condition where an interrupt can trigger just after the power_supply handle has been freed but before the IRQ handler is unregistered. As a result, the IRQ handler calls power_supply_changed() with a freed (invalid) power_supply handle, which can crash the system or cause silent memory corruption.

A similar issue can happen during device probe, where an interrupt fires before the power_supply handle is registered, leading to use of an uninitialized handle.

The fix involves ensuring that the IRQ is requested only after the power_supply handle has been registered, preventing the race condition.

Impact Analysis

This vulnerability can cause system instability by crashing the Linux kernel or causing silent memory corruption. Such crashes can lead to unexpected system reboots or failures, potentially resulting in data loss or service interruptions.

In environments where uptime and reliability are critical, this vulnerability could disrupt operations or degrade system performance.

Mitigation Strategies

The vulnerability is caused by a race condition in the Linux kernel power supply driver act8945a, where an interrupt handler may access a freed or uninitialized power_supply handle, leading to system crashes or memory corruption.

To mitigate this vulnerability immediately, ensure that your Linux kernel is updated to a version where this issue is fixed. The fix involves requesting the IRQ only after the power_supply handle has been registered, preventing the use-after-free condition.

If updating is not immediately possible, consider disabling the affected power supply driver (act8945a) or the related IRQ handling temporarily to avoid triggering the race condition.

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