CVE-2026-63839
Received Received - Intake

Memory Leak in Lenovo WMI Helpers Linux Kernel

Publication date: 2026-07-19

Last updated on: 2026-07-19

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: platform/x86: lenovo-wmi-helpers: Fix memory leak in lwmi_dev_evaluate_int() lwmi_dev_evaluate_int() leaks output.pointer when retval == NULL (found by sashiko.dev [1]). Fix it by moving `ret_obj = output.pointer' outside of the `if (retval)' block so that it is always freed by the __free cleanup callback. No functional change intended.

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Meta Information

Published
2026-07-19
Last Modified
2026-07-19
Generated
2026-07-20
AI Q&A
2026-07-19
EPSS Evaluated
N/A
NVD
CVE-2026-63839
EUVD
EUVD-2026-45523

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
lenovo lenovo-wmi-helpers *

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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 is a memory leak vulnerability in the Linux kernel's Lenovo WMI helpers module. The function lwmi_dev_evaluate_int() fails to properly free allocated memory when an error occurs (retval == NULL). The memory leak happens because output.pointer is not freed in this error case, though it would normally be freed by a cleanup callback.

Detection Guidance

This vulnerability is specific to the Linux kernel's Lenovo WMI helpers module. Detection requires checking for unpatched versions of the lenovo-wmi-helpers package. Use commands like 'modinfo lenovo-wmi-helpers' to verify the module version and 'dmesg | grep lwmi_dev_evaluate_int' to check for related errors.

Impact Analysis

The impact is limited to systems using Lenovo WMI helpers. A memory leak can cause gradual performance degradation over time as available memory decreases. In severe cases, it might lead to system instability or crashes if memory exhaustion occurs.

Compliance Impact

This vulnerability involves a memory leak in the Linux kernel's Lenovo WMI helpers, specifically in the lwmi_dev_evaluate_int() function. Memory leaks can lead to resource exhaustion, which may indirectly impact system stability and availability. However, there is no direct evidence in the provided context that this vulnerability affects compliance with standards like GDPR or HIPAA.

Mitigation Strategies

Update the Linux kernel to a version containing the fix. For Lenovo systems, apply the latest kernel updates or patches from your distribution. Reboot the system after updating to ensure the patched module is loaded.

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