CVEvulnerability
CVE-2025-70101
6.5 MEDIUM
Official page ↗
- Status
- Modified
- Published
- 2026-06-03
- Last modified
- 2026-07-22
- Assigner
- [email protected]
- CVSS 3.1 (134c704f-9b21-4f2e-91b3-4a467353bcc0)
- 6.5 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
- Weaknesses
- CWE-125
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.
Affected configurations
• gkostka lwext4 1.0.0
Related
Weakness · CWE (1)
- CWE-125 Out-of-bounds Read weakness
References
- https://github.com/gkostka/lwext4/issues/91 Exploit, Issue Tracking, Patch
- https://github.com/sigdevel/pocs/blob/main/res/lwext4/3/sig11_lwext4_ext4_extent_815 Exploit
- https://infosec.exchange/@sigdevel/116668958927817708 Exploit, Patch, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2026/06/29/6 www.openwall.com
- https://github.com/gkostka/lwext4/issues/91 Exploit, Issue Tracking, Patch