CVE-2026-93816 f2fs: validate inline dentry name lengths before conversion
A corrupted f2fs image can cause out-of-bounds reads during inline dentry conversion, potentially leading to system crashes or code execution.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-93816?
CVE-2026-93816 is a high-severity memory corruption vulnerability in Linux, published on 24 Sep 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
In the Linux kernel, the following vulnerability has been resolved:
f2fs: validate inline dentry name lengths before conversion
Inline dentry conversion copies names out of the inline dentry area before checking that each recorded name length fits in the available filename slots.
A corrupted image can therefore make the conversion path read past the inline filename storage while building the regular dentry block.
Validate each inline dentry name length against the inline filename area before copying it.
Which versions are affected by CVE-2026-93816?
How do I fix CVE-2026-93816?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-93816 being exploited?
There is no known exploitation of CVE-2026-93816 in the wild and no public exploit code.
Sources
Also known as AZL-104006, BELL-CVE-2026-93816, DEBIAN-CVE-2026-93816, GHSA-g6g4-c2jh-p7hg, UBUNTU-CVE-2026-93816.