CVE-2026-68303
Received Received - Intake

Null Dereference in Linux Kernel VC4 DRM Drivers

Publication date: 2026-08-10

Last updated on: 2026-08-10

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: drm/vc4: hvs/v3d: Fix null dereference in unbind The hvs and v3d drivers use dev_get_drvdata(master) in their unbind functions. Since the vc4-drm gets removed before its dependent drivers (vc4_hvs/vc4_v3d) the vc4_hvs_unbind/vc4_v3d_unbind functions try to get drvdata of its master and fails with a null dereference error. Use the data pointer passed to the unbind functions directly instead of dev_get_drvdata(master). This avoids using potentially freed memory.

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Meta Information

Published
2026-08-10
Last Modified
2026-08-10
Generated
2026-08-10
AI Q&A
2026-08-10
EPSS Evaluated
N/A
NVD
CVE-2026-68303
EUVD
EUVD-2026-55404

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 is a null dereference vulnerability in the Linux kernel's vc4 DRM driver. It occurs when the vc4-drm component is removed before its dependent drivers (vc4_hvs/vc4_v3d). These dependent drivers attempt to access driver data from their master device using dev_get_drvdata(master), but since the master has been freed, this results in a null pointer dereference error.

Detection Guidance

This vulnerability is specific to the Linux kernel's drm/vc4 drivers and does not have network-based detection methods. To detect it, check kernel logs for null dereference errors related to vc4_hvs_unbind or vc4_v3d_unbind functions. Use commands like dmesg | grep -i 'vc4' or journalctl -k | grep -i 'null dereference'.

Impact Analysis

This vulnerability could cause system crashes or instability when using graphics drivers on affected Linux systems. It specifically affects systems using the vc4 DRM driver with HVS or V3D components, potentially leading to kernel panics or forced reboots.

Mitigation Strategies

Update your Linux kernel to the latest stable version where this vulnerability is patched. If you cannot update immediately, avoid removing the vc4-drm module while dependent drivers (vc4_hvs/vc4_v3d) are still in use. Monitor kernel logs for related errors.

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