CVEvulnerability
CVE-2025-70099
7.5 HIGH
Official page ↗
- Status
- Deferred
- Published
- 2026-06-01
- Last modified
- 2026-07-22
- Assigner
- [email protected]
- CVSS 3.1 (134c704f-9b21-4f2e-91b3-4a467353bcc0)
- 7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weaknesses
- CWE-476
Description
A NULL pointer dereference in the ext4_dir_en_get_name_len function in include/ext4_dir.h of lwext4 1.0.0 allows attackers to cause a denial of service by supplying a specially crafted EXT4 filesystem image with malformed directory entries. During directory iteration, the code may fail to validate the directory entry pointer before accessing the name_len field, resulting in a segmentation fault. This affects versions based on (or equivalent to) the 2016-era codebase (1.0.0).
Related
Weakness · CWE (1)
- CWE-476 NULL Pointer Dereference weakness
References
- https://github.com/gkostka/lwext4/issues/89 github.com
- https://github.com/sigdevel/pocs/blob/main/res/lwext4/1/sig11_2_1_lwext4_ext4_dir_h_126 github.com
- https://infosec.exchange/@sigdevel/116668939725424227 infosec.exchange
- http://www.openwall.com/lists/oss-security/2026/06/29/4 www.openwall.com
- https://github.com/gkostka/lwext4/issues/89 github.com