CVE-2025-40316
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-12-08

Last updated on: 2025-12-08

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: drm/mediatek: Fix device use-after-free on unbind A recent change fixed device reference leaks when looking up drm platform device driver data during bind() but failed to remove a partial fix which had been added by commit 80805b62ea5b ("drm/mediatek: Fix kobject put for component sub-drivers"). This results in a reference imbalance on component bind() failures and on unbind() which could lead to a user-after-free. Make sure to only drop the references after retrieving the driver data by effectively reverting the previous partial fix. Note that holding a reference to a device does not prevent its driver data from going away so there is no point in keeping the reference.
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Meta Information
Published
2025-12-08
Last Modified
2025-12-08
Generated
2026-06-16
AI Q&A
2025-12-08
EPSS Evaluated
2026-06-15
NVD
CVE-2025-40316
EUVD
EUVD-2025-201629
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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Executive Summary

This vulnerability is a use-after-free issue in the Linux kernel's drm/mediatek driver. It occurs due to a reference imbalance caused by a partial fix that was not fully removed. Specifically, when binding or unbinding the device, the driver data references are not managed correctly, leading to a situation where the device's driver data can be accessed after it has been freed, which is unsafe.

Impact Analysis

The use-after-free vulnerability can lead to undefined behavior such as crashes, data corruption, or potential escalation of privileges if exploited. It may allow an attacker to execute arbitrary code or cause denial of service by manipulating the device driver data improperly.

Mitigation Strategies

To mitigate this vulnerability, update the Linux kernel to a version that includes the fix for the drm/mediatek device use-after-free issue on unbind. This fix ensures proper reference handling during component bind() and unbind() operations, preventing user-after-free conditions.

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