CVE-2026-23369

Boot-time kernel panic via stale ACPI region

Published Mar 25, 2026 · Updated Mar 25, 2026

NULL pointer dereference in the Linux kernel i801 I2C driver allows local users to trigger a kernel panic during system boot. Concurrent udev probes can deregister the ACPI I/O region between the i801_acpi_io_handler check and i2c_lock_bus, which dereferences missing lock_ops. Reachability requires multiple udev workers to race while collecting i801 device information; the resulting null dereference halts the booting system.

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 Linux kernel i801 I2C driver allows local users to trigger a kernel panic during system boot. Concurrent udev probes can deregister the ACPI I/O region between the i801_acpi_io_handler check and i2c_lock_bus, which dereferences missing lock_ops. Reachability requires multiple udev workers to race while collecting i801 device information; the resulting null dereference halts the booting system.

The record

CVE
CVE-2026-23369
Published
Mar 25, 2026
Updated
Mar 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-476, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 25, 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=6.7
  2. Affected versionversion=f707d6b9e7c18f669adfdb443906d46cfbaaa0c1 <1c72e7b0b442ce21a1348d9b8237cfddb67048eb
  3. Affected versionversion=f707d6b9e7c18f669adfdb443906d46cfbaaa0c1 <9507f9953a2a5647eb42668d0c243fdbd7e72954
  4. Affected versionversion=f707d6b9e7c18f669adfdb443906d46cfbaaa0c1 <c726273044a5a8308a889d19d6884135c0f3321d
  5. Affected versionversion=f707d6b9e7c18f669adfdb443906d46cfbaaa0c1 <cfc69c2e6c699c96949f7b0455195b0bfb7dc715

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.7; version=f707d6b9e7c18f669adfdb443906d46cfbaaa0c1 <1c72e7b0b442ce21a1348d9b8237cfddb67048eb; version=f707d6b9e7c18f669adfdb443906d46cfbaaa0c1 <9507f9953a2a5647eb42668d0c243fdbd7e72954; version=f707d6b9e7c18f669adfdb443906d46cfbaaa0c1 <c726273044a5a8308a889d19d6884135c0f3321d; version=f707d6b9e7c18f669adfdb443906d46cfbaaa0c1 <cfc69c2e6c699c96949f7b0455195b0bfb7dc715

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.

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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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
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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