Vulnerability 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).
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/gkostka/lwext4/issues/89
- https://github.com/sigdevel/pocs/blob/main/res/lwext4/1/sig11_2_1_lwext4_ext4_di
- https://infosec.exchange/@sigdevel/116668939725424227
- http://www.openwall.com/lists/oss-security/2026/06/29/4
- https://github.com/gkostka/lwext4/issues/89
FAQ
What is CVE-2025-70099?
CVE-2025-70099 is a vulnerability with a CVSS score of 7.5 (HIGH). 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...
How severe is CVE-2025-70099?
CVE-2025-70099 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-70099?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.