CVE-2025-37968

System hang via inconsistent IRQ flag reads

Published May 20, 2025 · Updated May 12, 2026

Improper locking in the OPT3001 driver in Linux and SIMATIC CN 4100 before V5.0 allows local users to hang affected systems. The opt3001_irq function reads the result-ready flag separately before locking and unlocking its mutex, so a concurrent flag change can leave the mutex permanently locked. Exploitation requires local low-privilege access, the affected driver and relevant device activity; the documented consequence is a deadlock with no confidentiality or integrity impact.

CVSS severity5.5
Medium
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Improper locking in the OPT3001 driver in Linux and SIMATIC CN 4100 before V5.0 allows local users to hang affected systems. The opt3001_irq function reads the result-ready flag separately before locking and unlocking its mutex, so a concurrent flag change can leave the mutex permanently locked. Exploitation requires local low-privilege access, the affected driver and relevant device activity; the documented consequence is a deadlock with no confidentiality or integrity impact.

The record

CVE
CVE-2025-37968
Published
May 20, 2025
Updated
May 12, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-667, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 20, 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

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=4.3
  2. Affected versionversion=94a9b7b1809f56cfaa080e70ec49b6979563a237 <1d7def97e7eb65865ccc01bbdf4eb9e6bbe8a5b5
  3. Affected versionversion=94a9b7b1809f56cfaa080e70ec49b6979563a237 <2c95c8f0959d0a72575eabf2ff888f47ed6d8b77
  4. Affected versionversion=94a9b7b1809f56cfaa080e70ec49b6979563a237 <748ebd8e61d0bc182c331b8df3887af7285c8a8f
  5. Affected versionversion=94a9b7b1809f56cfaa080e70ec49b6979563a237 <7ca84f6a22d50bf8b31efe9eb05f9859947266d7
  6. Affected versionversion=94a9b7b1809f56cfaa080e70ec49b6979563a237 <957e8be112636d9bc692917286e81e54bd87decc
  7. Affected versionversion=94a9b7b1809f56cfaa080e70ec49b6979563a237 <a9c56ccb7cddfca754291fb24b108a5350a5fbe9
  8. Affected versionversion=94a9b7b1809f56cfaa080e70ec49b6979563a237 <e791bf216c9e236b34dabf514ec0ede140cca719
  9. Affected versionversion=94a9b7b1809f56cfaa080e70ec49b6979563a237 <f063a28002e3350088b4577c5640882bf4ea17ea

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.3; version=94a9b7b1809f56cfaa080e70ec49b6979563a237 <1d7def97e7eb65865ccc01bbdf4eb9e6bbe8a5b5; version=94a9b7b1809f56cfaa080e70ec49b6979563a237 <2c95c8f0959d0a72575eabf2ff888f47ed6d8b77; version=94a9b7b1809f56cfaa080e70ec49b6979563a237 <748ebd8e61d0bc182c331b8df3887af7285c8a8f; version=94a9b7b1809f56cfaa080e70ec49b6979563a237 <7ca84f6a22d50bf8b31efe9eb05f9859947266d7; version=94a9b7b1809f56cfaa080e70ec49b6979563a237 <957e8be112636d9bc692917286e81e54bd87decc; version=94a9b7b1809f56cfaa080e70ec49b6979563a237 <a9c56ccb7cddfca754291fb24b108a5350a5fbe9; version=94a9b7b1809f56cfaa080e70ec49b6979563a237 <e791bf216c9e236b34dabf514ec0ede140cca719; version=94a9b7b1809f56cfaa080e70ec49b6979563a237 <f063a28002e3350088b4577c5640882bf4ea17ea
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
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

CWE-667Improper Locking
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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo