CVE-2025-38701

Local kernel crash via malformed ext4 inline data

Published Sep 4, 2025 · Updated Jul 14, 2026

Reachable assertion in affected Linux kernels and Siemens GNU/Linux subsystems allows local users to crash the kernel with crafted ext4 data. ext4_update_inline_data() calls BUG_ON when INLINE_DATA_FL is set but the inode lacks the system.data extended attribute; two related inline-data paths use the same fatal assertion pattern. Exploitation requires local low-privileged access and malicious filesystem metadata, and the documented consequence is a system crash without confidentiality or integrity loss.

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

Reachable assertion in affected Linux kernels and Siemens GNU/Linux subsystems allows local users to crash the kernel with crafted ext4 data. ext4_update_inline_data() calls BUG_ON when INLINE_DATA_FL is set but the inode lacks the system.data extended attribute; two related inline-data paths use the same fatal assertion pattern. Exploitation requires local low-privileged access and malicious filesystem metadata, and the documented consequence is a system crash without confidentiality or integrity loss.

The record

CVE
CVE-2025-38701
Published
Sep 4, 2025
Updated
Jul 14, 2026
Vendor
Siemens
Product
SIPLUS S7-1500 CPU 1518-4 PN/DP MFP
Classifications
CWE-617, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 4, 2025CVE publishedPublication date reported by the CVE source.
  2. Jul 14, 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 <*

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 <*
The Linux Kernel Organization · Linuxversion=3.8; version=67cf5b09a46f72e048501b84996f2f77bc42e947 <099b847ccc6c1ad2f805d13cfbcc83f5b6d4bc42; version=67cf5b09a46f72e048501b84996f2f77bc42e947 <1199a6399895f4767f0b9a68a6ff47c3f799b7c7; version=67cf5b09a46f72e048501b84996f2f77bc42e947 <279c87ef7b9da34f65c2e4db586e730b667a6fb9; version=67cf5b09a46f72e048501b84996f2f77bc42e947 <2817ac83cb4732597bf36853fe13ca616f4ee4e2; version=67cf5b09a46f72e048501b84996f2f77bc42e947 <7f322c12df7aeed1755acd3c6fab48c7807795fb; version=67cf5b09a46f72e048501b84996f2f77bc42e947 <8085a7324d8ec448c4a764af7853e19bbd64e17a; version=67cf5b09a46f72e048501b84996f2f77bc42e947 <81e7e2e7ba07e7c8cdce43ccad2f91adbc5a919c; version=67cf5b09a46f72e048501b84996f2f77bc42e947 <8a6f89d42e61788605722dd9faf98797c958a7e5; version=67cf5b09a46f72e048501b84996f2f77bc42e947 <d960f4b793912f35e9d72bd9d1e90553063fcbf1
Siemens · SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPversion=V3.1.5 <*
Siemens · SIMATIC CN 4100version=0 <V5.0
Siemens · SIMATIC S7-1500 CPU 1518-4 PN/DP MFPversion=V3.1.5 <*

Published CVSS scores

5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/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-617Reachable Assertion
T1499.004Application or System Exploitation

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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