CVE-2023-54244
Unknown Unknown - Not Provided
Use-After-Free in Linux ACPI EC Query Handler Causes Kernel Oops

Publication date: 2025-12-30

Last updated on: 2025-12-30

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: ACPI: EC: Fix oops when removing custom query handlers When removing custom query handlers, the handler might still be used inside the EC query workqueue, causing a kernel oops if the module holding the callback function was already unloaded. Fix this by flushing the EC query workqueue when removing custom query handlers. Tested on a Acer Travelmate 4002WLMi
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Meta Information
Published
2025-12-30
Last Modified
2025-12-30
Generated
2026-06-16
AI Q&A
2025-12-30
EPSS Evaluated
2026-06-14
NVD
CVE-2023-54244
EUVD
EUVD-2023-60397
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *
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Exploitability
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KEV
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CWE ID Description
CWE-UNKNOWN
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Impact Analysis

This vulnerability can cause a kernel oops, which is a crash of the Linux kernel. This can lead to system instability, unexpected reboots, or denial of service, especially if the affected module is unloaded while the EC query workqueue still references its handlers.

Mitigation Strategies

To mitigate this vulnerability, update the Linux kernel to a version where the ACPI EC query workqueue flushing fix has been applied. This prevents kernel oops caused by removing custom query handlers while they are still in use.

Executive Summary

This vulnerability occurs in the Linux kernel's ACPI EC (Embedded Controller) subsystem. When custom query handlers are removed, the handler might still be used inside the EC query workqueue. If the module containing the callback function has already been unloaded, this can cause a kernel oops (a type of kernel crash). The issue is fixed by flushing the EC query workqueue when removing custom query handlers to ensure no references remain.

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