CVE-2026-53058

Local kernel crash via uninitialized connector pointer

Published Jun 24, 2026 · Updated Jun 24, 2026

NULL pointer dereference in the Cadence MHDP8546 DRM bridge in Linux Kernel allows local users to crash the system. During atomic_enable(), link-up or register-read errors reach cdns_mhdp_modeset_retry_fn() before mhdp->connector_ptr is initialized, causing a NULL connector-mutex dereference. Exploitation requires local low-privileged access and the DRM_BRIDGE_ATTACH_NO_CONNECTOR attachment path; the bounded impact is a kernel crash.

CVSS severity5.5
Medium
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in the Cadence MHDP8546 DRM bridge in Linux Kernel allows local users to crash the system. During atomic_enable(), link-up or register-read errors reach cdns_mhdp_modeset_retry_fn() before mhdp->connector_ptr is initialized, causing a NULL connector-mutex dereference. Exploitation requires local low-privileged access and the DRM_BRIDGE_ATTACH_NO_CONNECTOR attachment path; the bounded impact is a kernel crash.

The record

CVE
CVE-2026-53058
Published
Jun 24, 2026
Updated
Jun 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-476, CWE-824, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.6
  2. Affected versionversion=c932ced6b58524eeb948ff252f6512cd6bcb9d9f <1af3b42e08a957e53bab8e1897393fe0a27d9fbf
  3. Affected versionversion=c932ced6b58524eeb948ff252f6512cd6bcb9d9f <43d6508ddbf9fb974fbc359a033154f78c9d4c8b
  4. Affected versionversion=c932ced6b58524eeb948ff252f6512cd6bcb9d9f <5302015daf26ef6b48e067f2b86c9482ac19e015
  5. Affected versionversion=c932ced6b58524eeb948ff252f6512cd6bcb9d9f <a3611554e599d1a24b45fd8415bacb72ce861e4b
  6. Affected versionversion=c932ced6b58524eeb948ff252f6512cd6bcb9d9f <cf2ac2cac8b319f89b3a3851ca0c5ffb6a549575

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.6; version=c932ced6b58524eeb948ff252f6512cd6bcb9d9f <1af3b42e08a957e53bab8e1897393fe0a27d9fbf; version=c932ced6b58524eeb948ff252f6512cd6bcb9d9f <43d6508ddbf9fb974fbc359a033154f78c9d4c8b; version=c932ced6b58524eeb948ff252f6512cd6bcb9d9f <5302015daf26ef6b48e067f2b86c9482ac19e015; version=c932ced6b58524eeb948ff252f6512cd6bcb9d9f <a3611554e599d1a24b45fd8415bacb72ce861e4b; version=c932ced6b58524eeb948ff252f6512cd6bcb9d9f <cf2ac2cac8b319f89b3a3851ca0c5ffb6a549575

Published CVSS scores

5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
CWE-824Access of Uninitialized Pointer
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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