CVE-2025-38614

Service interruption via unchecked eventpoll graph depth

Published Aug 19, 2025 · Updated Sep 8, 2026

Uncontrolled recursion in Linux kernel eventpoll allows local users to interrupt service by constructing deeply nested epoll graphs. The ep_loop_check_proc() checks ignore upward paths and reuse only one already visited downward path, allowing graphs to reach roughly 500 levels. Exploitation requires local code execution or access to a Siemens device's additional GNU/Linux environment, and the documented impact is limited to availability.

CVSS severity5.5
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncontrolled recursion in Linux kernel eventpoll allows local users to interrupt service by constructing deeply nested epoll graphs. The ep_loop_check_proc() checks ignore upward paths and reuse only one already visited downward path, allowing graphs to reach roughly 500 levels. Exploitation requires local code execution or access to a Siemens device's additional GNU/Linux environment, and the documented impact is limited to availability.

The record

CVE
CVE-2025-38614
Published
Aug 19, 2025
Updated
Sep 8, 2026
Vendor
Siemens
Product
SIPLUS S7-1500 CPU 1518-4 PN/DP MFP
Classifications
CWE-674, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 19, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 8, 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=V3.1.5 <*
  2. Affected versionversion=V3.1.6 <*

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Siemens · SIPLUS S7-1500 CPU 1518-4 PN/DP MFPversion=V3.1.5 <*; version=V3.1.6 <*
The Linux Kernel Organization · Linuxversion=0eccd188cfeaf857a26f2d72941d27d298cf6a54; version=22bacca48a1755f79b7e0f192ddb9fbb7fc6e64e <1b13b033062824495554e836a1ff5f85ccf6b039; version=22bacca48a1755f79b7e0f192ddb9fbb7fc6e64e <2a0c0c974bea9619c6f41794775ae4b97530e0e6; version=22bacca48a1755f79b7e0f192ddb9fbb7fc6e64e <3542c90797bc3ab83ebab54b737d751cf3682036; version=22bacca48a1755f79b7e0f192ddb9fbb7fc6e64e <71379495ab70eaba19224bd71b5b9b399eb85e04; version=22bacca48a1755f79b7e0f192ddb9fbb7fc6e64e <7a2125962c42d5336ca0495a9ce4cb38a63e9161; version=22bacca48a1755f79b7e0f192ddb9fbb7fc6e64e <ea5f97dbdcb1651581a22bd10afd2f0dd9dc11d6; version=22bacca48a1755f79b7e0f192ddb9fbb7fc6e64e <f2e467a48287c868818085aa35389a224d226732; version=2.6.32.30 <2.6.33; version=2.6.33.8 <2.6.34; version=2.6.34.10 <2.6.35; version=2.6.35.12 <2.6.36; version=2.6.37.3 <2.6.38; version=2.6.38; version=28a92748aa4bc57d35e7b079498b0ac2e7610a37; version=7eebcd4792c5a341559aed327b6afecbb1c46402; version=8216e1a0d47cae06a75c42346f19dffe14e42d57; version=a72affdbb09f3f24f64ffcbbdf62c2e57c58f379
Siemens · SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPversion=V3.1.5 <*; version=V3.1.6 <*
Siemens · SIMATIC CN 4100version=0 <V5.0
Siemens · SIMATIC S7-1500 CPU 1518-4 PN/DP MFPversion=V3.1.5 <*; version=V3.1.6 <*

Published CVSS scores

6.2Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.5Siemens ProductCERTCVSS: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-674Uncontrolled Recursion
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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