CVE-2025-70099
NULL Pointer Dereference in lwext4 Filesystem Library
Publication date: 2026-06-01
Last updated on: 2026-06-01
Assigner: MITRE
Description
Description
CVSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| lwext4 | lwext4 | From 1.0.0 (inc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-UNKNOWN |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability is a NULL pointer dereference in the ext4_dir_en_get_name_len function within the lwext4 1.0.0 codebase. It occurs because the function does not properly validate directory entry pointers before accessing the name_len field during directory iteration. An attacker can exploit this by providing a specially crafted EXT4 filesystem image with malformed directory entries, which causes the program to attempt to access invalid memory, leading to a segmentation fault.
How can this vulnerability impact me? :
The primary impact of this vulnerability is a denial of service (DoS). By exploiting the NULL pointer dereference, an attacker can cause the affected software to crash or become unresponsive when processing a malicious EXT4 filesystem image. This can disrupt normal operations and availability of systems relying on the vulnerable lwext4 library.