CVE-2025-70101 Memory corruption in n/a
Attackers can cause denial of service in applications using lwext4 by providing a crafted ext4 image, triggering an out-of-bounds read.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2025-70101?
CVE-2025-70101 is a medium-severity memory corruption vulnerability in n/a, published on 3 Jun 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-125
Which versions are affected by CVE-2025-70101?
It affects 1 product.
Products include Gkostka Lwext4.
How do I fix CVE-2025-70101?
No fix has been published for CVE-2025-70101 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2025-70101 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-70101 exists.
Other vulnerabilities in n/a
Sources
Also known as GHSA-4v99-r46p-gx3v.