Linux vulnerability

What happened

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.

Affected versions

Linux: c8b75bca92cbf064b9fa125fc74a85994452e935 through before 8f62aae059e06746a18a00af27179c3c0f17f4c7 (git); c8b75bca92cbf064b9fa125fc74a85994452e935 through before 708688ec31ac6b35103ba364dc300a09930079d4 (git); c8b75bca92cbf064b9fa125fc74a85994452e935 through before 261f0a3f0ac03248284f5116d3258f89c9642215 (git); c8b75bca92cbf064b9fa125fc74a85994452e935 through before 7dc3680b7ffe01add3e9299fde8471d2dd53a8ae (git); 4.4 Fixed: See vendor advisory.

Why it matters

Review the vendor advisory and exposure of the affected product to determine operational impact.

Detection & mitigation

• Apply vendor-provided updates or mitigations.
• Review affected product exposure and access logs.