CVE-2025-38192

Kernel crash via stale routing destination

Published Jul 4, 2025 · Updated Sep 8, 2026

Improper input validation in affected Linux kernels allows local users to crash the kernel through a protocol-changing NAT46 BPF program. Protocol-changing BPF helpers leave an IPv4 routing destination attached, so ip6_rcv_core dereferences incompatible routing state after IPv6 conversion. Reachability requires permission to attach an ingress BPF program and an IPv4 multicast packet that is looped back after conversion.

CVSS severity7.8
High
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

Improper input validation in affected Linux kernels allows local users to crash the kernel through a protocol-changing NAT46 BPF program. Protocol-changing BPF helpers leave an IPv4 routing destination attached, so ip6_rcv_core dereferences incompatible routing state after IPv6 conversion. Reachability requires permission to attach an ingress BPF program and an IPv4 multicast packet that is looped back after conversion.

The record

CVE
CVE-2025-38192
Published
Jul 4, 2025
Updated
Sep 8, 2026
Vendor
Siemens
Product
SIPLUS S7-1500 CPU 1518-4 PN/DP MFP
Classifications
CWE-20, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 4, 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=4.8; version=6578171a7ff0c31dc73258f93da7407510abf085 <2a3ad42a57b43145839f2f233fb562247658a6d9; version=6578171a7ff0c31dc73258f93da7407510abf085 <98b1d8dc9a3170b2614f1e8c93854e75cdd83980; version=6578171a7ff0c31dc73258f93da7407510abf085 <a046f183d21ab5ace5a96ece4cf9873a42f003a7; version=6578171a7ff0c31dc73258f93da7407510abf085 <ba9db6f907ac02215e30128770f85fbd7db2fcf9; version=6578171a7ff0c31dc73258f93da7407510abf085 <bfa4d86e130a09f67607482e988313430e38f6c4; version=6578171a7ff0c31dc73258f93da7407510abf085 <e9994e7b9f7bbb882d13c8191731649249150d21
Siemens · SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPversion=V3.1.5 <*; version=V3.1.6 <*
Siemens · SIMATIC S7-1500 CPU 1518-4 PN/DP MFPversion=V3.1.5 <*; version=V3.1.6 <*

Published CVSS scores

6.1Siemens ProductCERTCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H
7.8Linux Kernel CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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-20Improper Input Validation
T1499.004Endpoint 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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