CVE-2026-53058

Analyzed Analyzed - Analysis Complete

NULL Pointer Dereference in Linux Kernel DRM Bridge

Publication date: 2026-06-24

Last updated on: 2026-07-21

Assigner: kernel.org

Description

In the Linux kernel, the following vulnerability has been resolved: drm/bridge: cadence: cdns-mhdp8546-core: Set the mhdp connector earlier in atomic_enable() In case if we get errors in cdns_mhdp_link_up() or cdns_mhdp_reg_read() in atomic_enable, we will go to cdns_mhdp_modeset_retry_fn() and will hit NULL pointer while trying to access the mutex. We need the connector to be set before that. Unlike in legacy cases with flag !DRM_BRIDGE_ATTACH_NO_CONNECTOR, we do not have connector initialised in bridge_attach(), so add the mhdp->connector_ptr in device structure to handle both cases with DRM_BRIDGE_ATTACH_NO_CONNECTOR and !DRM_BRIDGE_ATTACH_NO_CONNECTOR, set it in atomic_enable() earlier to avoid possible NULL pointer dereference in recovery paths like modeset_retry_fn() with the DRM_BRIDGE_ATTACH_NO_CONNECTOR flag set.

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Meta Information

Published

2026-06-24

Last Modified

2026-07-21

Generated

2026-08-04

AI Q&A

2026-06-24

EPSS Evaluated

2026-08-03

NVD

CVE-2026-53058

EUVD

EUVD-2026-38926

Affected Vendors & Products

Vendor	Product	Version / Range
linux	linux_kernel	From 6.7 (inc) to 6.12.91 (exc)
linux	linux_kernel	From 6.13 (inc) to 6.18.33 (exc)
linux	linux_kernel	From 6.19 (inc) to 7.0.10 (exc)
linux	linux_kernel	From 6.6 (inc) to 6.6.141 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-476	The product dereferences a pointer that it expects to be valid but is NULL.

Attack-Flow Graph

Executive Summary

This vulnerability exists in the Linux kernel's drm/bridge component, specifically in the cadence cdns-mhdp8546-core driver. The issue arises because the mhdp connector is not set early enough in the atomic_enable() function. If errors occur in the functions cdns_mhdp_link_up() or cdns_mhdp_reg_read() during atomic_enable, the code attempts to recover by calling cdns_mhdp_modeset_retry_fn(). However, at this point, it tries to access a mutex through a NULL pointer because the connector was not initialized beforehand. This leads to a NULL pointer dereference.

The fix involves setting the mhdp connector earlier in atomic_enable() to ensure it is initialized before any recovery paths that might access it, preventing the NULL pointer dereference.

Impact Analysis

This vulnerability can cause the Linux kernel to dereference a NULL pointer during certain error recovery paths in the cadence cdns-mhdp8546-core driver. This can lead to kernel crashes or system instability, potentially causing denial of service or unexpected behavior in systems using this driver.

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