CVE-2026-31655

System hang via disabled NOC_HDCP clock

Published Apr 24, 2026 · Updated Apr 24, 2026

Denial of service in the Linux kernel allows local users to hang affected NXP IMX8MP systems during power-domain shutdown. The imx8mp-blk-ctrl driver disables NOC_HDCP while the NoC ADB400 port still needs that clock to finish the power-down handshake. Reachability requires an IMX8MP platform using this power-domain path; the failure stalls the system without reported data disclosure or modification.

CVSS severity5.5
Medium
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in the Linux kernel allows local users to hang affected NXP IMX8MP systems during power-domain shutdown. The imx8mp-blk-ctrl driver disables NOC_HDCP while the NoC ADB400 port still needs that clock to finish the power-down handshake. Reachability requires an IMX8MP platform using this power-domain path; the failure stalls the system without reported data disclosure or modification.

The record

CVE
CVE-2026-31655
Published
Apr 24, 2026
Updated
Apr 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 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=6.1
  2. Affected versionversion=77b0ddb42add47748c661f714e6f4b116a6e8759 <3086374e8bc7fd65f2cc62ef52351c6d662f1543
  3. Affected versionversion=77b0ddb42add47748c661f714e6f4b116a6e8759 <80fd0de89805a3f92dc320f5ab5a18007c260374
  4. Affected versionversion=77b0ddb42add47748c661f714e6f4b116a6e8759 <d1ef779d02b5df4e8bff4083b20bfea587b43c4b
  5. Affected versionversion=77b0ddb42add47748c661f714e6f4b116a6e8759 <e44919669f07b8f113ad49a248b44ca4f119bc94
  6. Affected versionversion=77b0ddb42add47748c661f714e6f4b116a6e8759 <e91d5f94acf68618ea3ad9c92ac28614e791ae7d

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.1; version=77b0ddb42add47748c661f714e6f4b116a6e8759 <3086374e8bc7fd65f2cc62ef52351c6d662f1543; version=77b0ddb42add47748c661f714e6f4b116a6e8759 <80fd0de89805a3f92dc320f5ab5a18007c260374; version=77b0ddb42add47748c661f714e6f4b116a6e8759 <d1ef779d02b5df4e8bff4083b20bfea587b43c4b; version=77b0ddb42add47748c661f714e6f4b116a6e8759 <e44919669f07b8f113ad49a248b44ca4f119bc94; version=77b0ddb42add47748c661f714e6f4b116a6e8759 <e91d5f94acf68618ea3ad9c92ac28614e791ae7d

Published CVSS scores

5.5NIST NVDCVSS: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

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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