CVE-2025-70101

6.5 MEDIUM

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...

Published: 2026-06-03 · Last updated: 2026-06-05

Severity and scoring

CVSS: 6.5 MEDIUM
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
CWE: CWE-125

Affected products

Vendor	Product
gkostka	lwext4

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.

Source: NVD

References

[NVD]https://nvd.nist.gov/vuln/detail/CVE-2025-70101
[Patch]https://github.com/gkostka/lwext4/issues/91
[Exploit reference]https://github.com/sigdevel/pocs/blob/main/res/lwext4/3/sig11_lwext4_ext4_extent_815
[Patch]https://infosec.exchange/@sigdevel/116668958927817708
[Patch]https://github.com/gkostka/lwext4/issues/91

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