CVE-2025-70099 Null dereference in n/a
Attackers can cause a denial of service in applications using lwext4 by providing a crafted EXT4 image that triggers a null pointer dereference.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-70099?
CVE-2025-70099 is a high-severity vulnerability in n/a, published on 1 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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).
Weakness: CWE-476
Which versions are affected by CVE-2025-70099?
How do I fix CVE-2025-70099?
No fix has been published for CVE-2025-70099 yet. Limit exposure of the affected software until one is available.
Is CVE-2025-70099 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-70099 exists.
Sources
Also known as GHSA-vgqp-ggfv-3xf6.