gkostka lwext4 1.0.0 Fileystem Image src/ext4_blockdev.c ext4_block_set_lb_size denial of service

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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3.3$0-$5k2.87-

Summaryinfo

A vulnerability was found in gkostka lwext4 1.0.0. It has been classified as problematic. The affected element is the function ext4_block_set_lb_size of the file src/ext4_blockdev.c of the component Fileystem Image Handler. Performing a manipulation results in denial of service. This vulnerability is identified as CVE-2025-70100. Additionally, an exploit exists.

Detailsinfo

A vulnerability, which was classified as problematic, was found in gkostka lwext4 1.0.0. This affects the function ext4_block_set_lb_size of the file src/ext4_blockdev.c of the component Fileystem Image Handler. The manipulation with an unknown input leads to a denial of service vulnerability. CWE is classifying the issue as CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. This is going to have an impact on availability. The summary by CVE is:

A divide-by-zero vulnerability in the ext4_block_set_lb_size function in src/ext4_blockdev.c of the lwext4 1.0.0 library allows attackers to cause a denial of service by providing a malformed ext4 filesystem image that results in a zero logical block size. The vulnerability is triggered during mount or image processing and leads to a Floating-Point Exception (FPE) under sanitizers or a runtime crash in standard builds due to missing validation of lb_size.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2025-70100 since 01/09/2026. Technical details and a public exploit are known.

The exploit is shared for download at github.com. It is declared as proof-of-concept.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

Name

Version

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 3.5
VulDB Meta Temp Score: 3.3

VulDB Base Score: 3.5
VulDB Temp Score: 3.3
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Denial of service
CWE: CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Partially

Availability: 🔒
Access: Public
Status: Proof-of-Concept
Download: 🔒
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

01/09/2026 CVE reserved
06/03/2026 +144 days Advisory disclosed
06/03/2026 +0 days VulDB entry created
06/03/2026 +0 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: 90
Status: Confirmed

CVE: CVE-2025-70100 (🔒)
GCVE (CVE): GCVE-0-2025-70100
GCVE (VulDB): GCVE-100-368121
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 06/03/2026 16:29
Changes: 06/03/2026 16:29 (59)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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