CVE-2022-49427

Kernel warning via duplicate IOMMU clock disable

Published Feb 26, 2025 · Updated May 23, 2026

Improper clock handling in the MediaTek IOMMU driver in Linux 5.13 allows local users to trigger a kernel warning during device unbind. The mtk_iommu_remove function calls clk_disable even though runtime callbacks already control the IOMMU clock, causing a second disable operation. The path requires local access to write the driver's sysfs unbind interface; the documented consequence is a warning and call trace.

CVSS severity5.5
Medium
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper clock handling in the MediaTek IOMMU driver in Linux 5.13 allows local users to trigger a kernel warning during device unbind. The mtk_iommu_remove function calls clk_disable even though runtime callbacks already control the IOMMU clock, causing a second disable operation. The path requires local access to write the driver's sysfs unbind interface; the documented consequence is a warning and call trace.

The record

CVE
CVE-2022-49427
Published
Feb 26, 2025
Updated
May 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 26, 2025CVE publishedPublication date reported by the CVE source.
  2. May 23, 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=5.12.4 <5.13
  2. Affected versionversion=5.13
  3. Affected versionversion=5cad9e2caa9613fdcd246bd4ebf0ffbec1cba2ca
  4. Affected versionversion=b34ea31fe013569d42b7e8681ef3f717f77c5b72 <053465ab20dcd324a43a1811ee98e5721e6a3e65
  5. Affected versionversion=b34ea31fe013569d42b7e8681ef3f717f77c5b72 <6eaa046c696c83542c56765cdde564d9818ff1fb
  6. Affected versionversion=b34ea31fe013569d42b7e8681ef3f717f77c5b72 <98df772bdd1c4ce717a26289efea15cbbe4b64ed
  7. Affected versionversion=b34ea31fe013569d42b7e8681ef3f717f77c5b72 <9b3bd97acb4f8954b8a43a5d63ed9050d463b4e1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.12.4 <5.13; version=5.13; version=5cad9e2caa9613fdcd246bd4ebf0ffbec1cba2ca; version=b34ea31fe013569d42b7e8681ef3f717f77c5b72 <053465ab20dcd324a43a1811ee98e5721e6a3e65; version=b34ea31fe013569d42b7e8681ef3f717f77c5b72 <6eaa046c696c83542c56765cdde564d9818ff1fb; version=b34ea31fe013569d42b7e8681ef3f717f77c5b72 <98df772bdd1c4ce717a26289efea15cbbe4b64ed; version=b34ea31fe013569d42b7e8681ef3f717f77c5b72 <9b3bd97acb4f8954b8a43a5d63ed9050d463b4e1

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

No sourced classifications are available.

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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