CVE-2026-45906
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Use-After-Free in Linux Kernel Power Supply Subsystem

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: pf1550: 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-2026-45906
EUVD
EUVD-2026-32372
Affected Vendors & Products
Showing 2 associated CPEs
Vendor Product Version / Range
linux kernel *
linux linux_kernel *
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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 pf1550 power supply driver. It is a use-after-free bug caused by the order in which resources are allocated and deallocated.

The issue arises because the interrupt request (IRQ) is requested before the power_supply handle is allocated and registered. Since resource deallocation happens in reverse order, the power_supply handle can be freed before the IRQ handler is unregistered.

This creates a race condition during device removal where an interrupt can trigger just after the power_supply handle has been freed but before the IRQ handler is unregistered. The IRQ handler then calls power_supply_changed() using a freed handle, which can crash the system or corrupt memory.

A similar problem can occur during device probing if 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 or crashes due to the use-after-free condition in the power supply driver.

It may also lead to silent memory corruption, which can cause unpredictable behavior or security issues in the affected system.

Because it affects the kernel's power supply management, it could impact device power management and reliability.

Mitigation Strategies

To mitigate this vulnerability, ensure that the Linux kernel is updated to a version where the fix has been applied. The fix involves requesting the IRQ only after the registration of the power_supply handle to avoid the use-after-free race condition.

Specifically, avoid using the devm_ variant for requesting IRQ before allocating/registering the power_supply handle. Instead, request the IRQ after the power_supply handle registration to prevent interrupts from firing on a freed or uninitialized handle.

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