CVE-2023-53389
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-09-18

Last updated on: 2025-12-11

Assigner: kernel.org

Description
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.
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Meta Information
Published
2025-09-18
Last Modified
2025-12-11
Generated
2026-06-16
AI Q&A
2025-09-18
EPSS Evaluated
2026-06-14
NVD
CVE-2023-53389
Affected Vendors & Products
Showing 3 associated CPEs
Vendor Product Version / Range
linux linux_kernel From 6.1 (inc) to 6.1.28 (exc)
linux linux_kernel From 6.2 (inc) to 6.2.15 (exc)
linux linux_kernel From 6.3 (inc) to 6.3.2 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-476 The product dereferences a pointer that it expects to be valid but is NULL.
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Executive Summary

This vulnerability occurs in the MediaTek DisplayPort interface bridge driver in the Linux kernel. The driver starts its interrupts as soon as it is probed, but sometimes these interrupts trigger before the bridge is attached to a DRM device. Because the function drm_helper_hpd_irq_event() does not verify if the drm_device passed to it is valid, a NULL pointer can be passed, causing a kernel NULL pointer dereference (a type of crash). The fix ensures that HPD (Hot Plug Detect) events are only triggered if the bridge is properly attached.

Impact Analysis

This vulnerability can cause a kernel NULL pointer dereference, which may lead to a system crash or instability in the Linux kernel when using the MediaTek DisplayPort interface bridge driver. This could result in denial of service or unexpected behavior on affected systems.

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