CVE-2023-53569 ext2: Check block size validity during mount
An integer overflow in the ext2 filesystem mount process can lead to undefined behavior and potential denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2023-53569?
CVE-2023-53569 is a high-severity vulnerability in Linux kernel, published on 4 Oct 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
ext2: Check block size validity during mount
Check that log of block size stored in the superblock has sensible value. Otherwise the shift computing the block size can overflow leading to undefined behavior.
Which versions are affected by CVE-2023-53569?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2023-53569?
Apply the vendor's patch.
Is CVE-2023-53569 being exploited?
There is no known exploitation of CVE-2023-53569 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2023-53569, DEBIAN-CVE-2023-53569, GHSA-5576-c4r8-hvqj, UBUNTU-CVE-2023-53569.