CVE-2026-45879
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Use-After-Free in Linux Kernel bq25980 Power Supply 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: bq25980: 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-2026-45879
EUVD
EUVD-2026-32345
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
ti power_supply bq25980
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Exploitability
CWE
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KEV
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CWE ID Description
CWE-UNKNOWN
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Executive Summary

This vulnerability is a use-after-free bug in the Linux kernel's power supply driver for the bq25980 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 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, causing the handler to use an uninitialized handle.

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

Impact Analysis

This vulnerability can lead to system instability or crashes because the interrupt handler may access freed memory, causing use-after-free errors.

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

Mitigation Strategies

This vulnerability is caused by a race condition in the Linux kernel power supply driver for bq25980, where the IRQ handler may access a freed or uninitialized power_supply handle, potentially crashing the system or corrupting memory.

To mitigate this vulnerability immediately, ensure that the Linux kernel version you are using includes the fix that requests the IRQ only after the power_supply handle has been registered. This prevents the use-after-free condition.

If updating the kernel is not immediately possible, consider disabling the affected power supply driver (bq25980) temporarily to avoid triggering the race condition.

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