CVE-2026-23055

Suspend disruption via misordered RIIC power callbacks

Published Feb 4, 2026 · Updated Feb 4, 2026

A suspend-ordering flaw in the Linux kernel 6.12 RIIC driver allows I2C transfers after the controller has already been suspended. The driver's system-sleep callbacks disable runtime power management before dependent devices finish I2C work, leaving an autosuspended controller unable to wake until resume_early. The issue requires a suspend or resume cycle on hardware using the Renesas RIIC controller and can trigger a kernel warning or leave some I2C devices unavailable during that transition.

CVSS severityUnavailable
Unscored
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A suspend-ordering flaw in the Linux kernel 6.12 RIIC driver allows I2C transfers after the controller has already been suspended. The driver's system-sleep callbacks disable runtime power management before dependent devices finish I2C work, leaving an autosuspended controller unable to wake until resume_early. The issue requires a suspend or resume cycle on hardware using the Renesas RIIC controller and can trigger a kernel warning or leave some I2C devices unavailable during that transition.

The record

CVE
CVE-2026-23055
Published
Feb 4, 2026
Updated
Feb 4, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
Unavailable
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Feb 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 4, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=53326135d0e041ebe7d08bf22f82529ae69a096e <0b4c0fbbe00b7de76bdaea7fa771017d7a979b0d
  2. Affected versionversion=53326135d0e041ebe7d08bf22f82529ae69a096e <469f8fe4c87e43520f279e45b927c35d6fe99194
  3. Affected versionversion=53326135d0e041ebe7d08bf22f82529ae69a096e <e383f0961422f983451ac4dd6aed1a3d3311f2be
  4. Affected versionversion=6.12

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linux Kernelversion=53326135d0e041ebe7d08bf22f82529ae69a096e <0b4c0fbbe00b7de76bdaea7fa771017d7a979b0d; version=53326135d0e041ebe7d08bf22f82529ae69a096e <469f8fe4c87e43520f279e45b927c35d6fe99194; version=53326135d0e041ebe7d08bf22f82529ae69a096e <e383f0961422f983451ac4dd6aed1a3d3311f2be; version=6.12

Published CVSS scores

No CVSS assessment is available in this record.

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.

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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
PrivilegesUnavailable
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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