CVE-2025-70101

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.

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Produits concernés

• Gkostka lwext4

Scores CVSS

Faiblesses (CWE)

• CWE-125

Références

• https://github.com/gkostka/lwext4/issues/91 ExploitIssue TrackingPatch
• https://github.com/sigdevel/pocs/blob/main/res/lwext4/3/sig11_lwext4_ext4_extent_815 Exploit
• https://infosec.exchange/@sigdevel/116668958927817708 ExploitPatchThird Party Advisory
• http://www.openwall.com/lists/oss-security/2026/06/29/6
• https://github.com/gkostka/lwext4/issues/91 ExploitIssue TrackingPatch

Ailleurs

• NVD
• CVE.org
• CIRCL Vulnerability-Lookup
• CERT-FR
• GitHub Advisories