CVE-2025-38694

Kernel crash via unchecked I2C message lengths

Published Sep 4, 2025 · Updated May 12, 2026

NULL pointer dereference in Linux and SIMATIC CN 4100 before V5.0 allows local users to crash the kernel through malformed I2C messages. dib7090p_rw_on_apb reads msg[0].buf[2] and bytes from msg[1].buf after zero lengths let earlier buffer checks pass. Exploitation requires low-privilege local access and the affected dib7090p DVB frontend path; the demonstrated consequence is service interruption by kernel crash.

CVSS severity5.5
Medium
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

NULL pointer dereference in Linux and SIMATIC CN 4100 before V5.0 allows local users to crash the kernel through malformed I2C messages. dib7090p_rw_on_apb reads msg[0].buf[2] and bytes from msg[1].buf after zero lengths let earlier buffer checks pass. Exploitation requires low-privilege local access and the affected dib7090p DVB frontend path; the demonstrated consequence is service interruption by kernel crash.

The record

CVE
CVE-2025-38694
Published
Sep 4, 2025
Updated
May 12, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 4, 2025CVE publishedPublication date reported by the CVE source.
  2. May 12, 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=2.6.39
  2. Affected versionversion=713d54a8bd812229410a1902cd9b332a2a27af9f <09906650484a09b3a4d4b3d3065395856810becd
  3. Affected versionversion=713d54a8bd812229410a1902cd9b332a2a27af9f <0bb32863426afe0badac25c28d59021f211d0f48
  4. Affected versionversion=713d54a8bd812229410a1902cd9b332a2a27af9f <19eb5d8e6aa1169d368a4d69aae5572950deb89d
  5. Affected versionversion=713d54a8bd812229410a1902cd9b332a2a27af9f <529fd5593b721e6f4370c591f5086649ed149ff6
  6. Affected versionversion=713d54a8bd812229410a1902cd9b332a2a27af9f <a0f744d6cdde81d7382e183f77a4080a39b206cd
  7. Affected versionversion=713d54a8bd812229410a1902cd9b332a2a27af9f <bc07cae4f36bb18d5b6a9ed835c1278ca44ec82e
  8. Affected versionversion=713d54a8bd812229410a1902cd9b332a2a27af9f <c33280d6bd668dbdc5a5f07887cc63a52ab4789c
  9. Affected versionversion=713d54a8bd812229410a1902cd9b332a2a27af9f <ce5cac69b2edac3e3246fee03e8f4c2a1075238b
  10. Affected versionversion=713d54a8bd812229410a1902cd9b332a2a27af9f <ce8b7c711b9c4f040b5419729d0972db8e374324

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.39; version=713d54a8bd812229410a1902cd9b332a2a27af9f <09906650484a09b3a4d4b3d3065395856810becd; version=713d54a8bd812229410a1902cd9b332a2a27af9f <0bb32863426afe0badac25c28d59021f211d0f48; version=713d54a8bd812229410a1902cd9b332a2a27af9f <19eb5d8e6aa1169d368a4d69aae5572950deb89d; version=713d54a8bd812229410a1902cd9b332a2a27af9f <529fd5593b721e6f4370c591f5086649ed149ff6; version=713d54a8bd812229410a1902cd9b332a2a27af9f <a0f744d6cdde81d7382e183f77a4080a39b206cd; version=713d54a8bd812229410a1902cd9b332a2a27af9f <bc07cae4f36bb18d5b6a9ed835c1278ca44ec82e; version=713d54a8bd812229410a1902cd9b332a2a27af9f <c33280d6bd668dbdc5a5f07887cc63a52ab4789c; version=713d54a8bd812229410a1902cd9b332a2a27af9f <ce5cac69b2edac3e3246fee03e8f4c2a1075238b; version=713d54a8bd812229410a1902cd9b332a2a27af9f <ce8b7c711b9c4f040b5419729d0972db8e374324
Siemens · SIMATIC CN 4100version=0 <V5.0

Published CVSS scores

5.5Siemens ProductCERTCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
6.8SUSECVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
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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