CVE-2025-70101

Name: CVE-2025-70101
Creator: NVD / NIST
Published: 2026-06-03T14:16:31.34+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 0.26%

Last modified Jun 17, 2026

CVE-2025-70101 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. An out-of-bounds read in the ext4_ext_binsearch_idx function in src/ext4_extent.c of the lwext4 1.0.0 library allows attackers to cause a denial of service by supplying a specially crafted ext4 filesystem image. The vulnerability occurs due to insufficient validation of extent header fields before performing a binary search over extent index entries, which can result in invalid pointer calculations and an out-of-bounds memory read during extent tree traversal.. EPSS estimates a 0.26% chance of exploitation in the next 30 days.

Description

An out-of-bounds read in the ext4_ext_binsearch_idx function in src/ext4_extent.c of the lwext4 1.0.0 library allows attackers to cause a denial of service by supplying a specially crafted ext4 filesystem image. The vulnerability occurs due to insufficient validation of extent header fields before performing a binary search over extent index entries, which can result in invalid pointer calculations and an out-of-bounds memory read during extent tree traversal.

Metrics

CVSS 3.1

6.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

EPSS Probability

0.26%

17.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-125

Affected Software

Vendor	Product	Versions
Gkostka	Lwext4	1.0.0

References

https://github.com/gkostka/lwext4/issues/91Exploit, Issue Tracking, Patch
https://github.com/sigdevel/pocs/blob/main/res/lwext4/3/sig11_lwext4_ext4_extent_815Exploit
https://infosec.exchange/@sigdevel/116668958927817708Exploit, Patch, Third Party Advisory
https://github.com/gkostka/lwext4/issues/91Exploit, Issue Tracking, Patch

Timeline

Published: Jun 3, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2025-70101?

How severe is CVE-2025-70101?

CVE-2025-70101 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.26% probability of exploitation in the next 30 days.

How do I fix CVE-2025-70101?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-70101?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST