CVE-2023-53389

In the Linux kernel, the following vulnerability has been resolved: drm/mediatek: dp: Only trigger DRM HPD events if bridge is attached The MediaTek DisplayPort interface bridge driver starts its interrupts as soon as its probed. However when the interrupts trigger the bridge might not have been attached to a DRM device. As drm_helper_hpd_irq_event() does not check whether the passed in drm_device is valid or not, a NULL pointer passed in results in a kernel NULL pointer dereference in it. Check whether the bridge is attached and only trigger an HPD event if it is.

• CWE-476
• CWE-476

• https://git.kernel.org/stable/c/3551789d0635dfb2df8ab8e7fdbf0647e9c1724cPatch
• https://git.kernel.org/stable/c/36b617f7e4ae663fcadd202ea061ca695ca75539Patch
• https://git.kernel.org/stable/c/6524d3d58797975cc40b85be1e9b89721b4e8d0bPatch
• https://git.kernel.org/stable/c/d1c04e338016ae2517c641806a831b1f3eee2bedPatch

Published

Sep 18, 2025

Last Modified

Jun 17, 2026

Status

Modified

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