CVE-2025-70099Public exploitNetwork attack vector

Application crash via unchecked directory-entry pointer

Published Jun 1, 2026 · Updated Jun 1, 2026

NULL pointer dereference in lwext4 1.0.0 allows attackers to crash applications by supplying a malformed EXT4 filesystem image. During directory iteration, ext4_dir_entry_next passes a NULL directory-entry pointer to ext4_dir_en_get_name_len, which reads en->name_len without validation. Exploitation requires an application to process the crafted image and iterate its corrupted directory; the demonstrated consequence is a segmentation-fault crash.

CVSS severity7.5
High
EPSS probability0.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in lwext4 1.0.0 allows attackers to crash applications by supplying a malformed EXT4 filesystem image. During directory iteration, ext4_dir_entry_next passes a NULL directory-entry pointer to ext4_dir_en_get_name_len, which reads en->name_len without validation. Exploitation requires an application to process the crafted image and iterate its corrupted directory; the demonstrated consequence is a segmentation-fault crash.

The record

CVE
CVE-2025-70099
Published
Jun 1, 2026
Updated
Jun 1, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-476
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 1, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 1, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-476NULL Pointer Dereference

Public exploit references

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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