CVE-2024-35807

File-system corruption via misclassified resize group

Published May 17, 2024 · Updated May 12, 2026

Ext4 metadata corruption in Linux allows local users to damage file-system data during an online resize across a meta block group boundary. ext4_flex_group_add updates backup block group descriptors using the non-meta_bg layout without first checking whether the added group belongs to the first meta block group. The path requires an ext4 online resize with resize_inode disabled, as occurs by default above 16 TiB with 4 KiB blocks or when the feature is explicitly disabled.

CVSS severity5.5
Medium
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Ext4 metadata corruption in Linux allows local users to damage file-system data during an online resize across a meta block group boundary. ext4_flex_group_add updates backup block group descriptors using the non-meta_bg layout without first checking whether the added group belongs to the first meta block group. The path requires an ext4 online resize with resize_inode disabled, as occurs by default above 16 TiB with 4 KiB blocks or when the feature is explicitly disabled.

The record

CVE
CVE-2024-35807
Published
May 17, 2024
Updated
May 12, 2026
Vendor
Siemens
Product
SIPLUS S7-1500 CPU 1518-4 PN/DP MFP
Classifications
CWE-400, T1485
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 17, 2024CVE 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=V3.1.0 <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=V3.1.0 <V3.1.5
Siemens · SIMATIC S7-1500 TM MFP - GNU/Linux subsystemversion=0 <*
The Linux Kernel Organization · Linuxversion=01f795f9e0d67adeccc61a8b20c28acb45fa5fd8 <239c669edb2bffa1aa2612519b1d438ab35d6be6; version=01f795f9e0d67adeccc61a8b20c28acb45fa5fd8 <37b6a3ba793bbbae057f5b991970ebcc52cb3db5; version=01f795f9e0d67adeccc61a8b20c28acb45fa5fd8 <722d2c01b8b108f8283d1b7222209d5b2a5aa7bd; version=01f795f9e0d67adeccc61a8b20c28acb45fa5fd8 <75cc31c2e7193b69f5d25650bda5bb42ed92f8a1; version=01f795f9e0d67adeccc61a8b20c28acb45fa5fd8 <a6b3bfe176e8a5b05ec4447404e412c2a3fc92cc; version=01f795f9e0d67adeccc61a8b20c28acb45fa5fd8 <b461910af8ba3bed80f48c2bf852686d05c6fc5c; version=01f795f9e0d67adeccc61a8b20c28acb45fa5fd8 <e8e8b197317228b5089ed9e7802dadf3ccaa027a; version=01f795f9e0d67adeccc61a8b20c28acb45fa5fd8 <ee4e9c1976147a850f6085a13fca95bcaa00d84c; version=01f795f9e0d67adeccc61a8b20c28acb45fa5fd8 <fb1088d51bbaa0faec5a55d4f5818a9ab79e24df; version=3.7
Siemens · SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPversion=V3.1.0 <V3.1.5
Siemens · SIMATIC S7-1500 CPU 1518-4 PN/DP MFPversion=V3.1.0 <V3.1.5

Published CVSS scores

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-400Uncontrolled Resource Consumption
T1485Data Destruction

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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