CVE-2025-40077 f2fs: fix to avoid overflow while left shift operation
An integer overflow in the Linux kernel f2fs filesystem can lead to denial of service, requiring local access to exploit.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-40077?
CVE-2025-40077 is a vulnerability in Linux, published on 28 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:
f2fs: fix to avoid overflow while left shift operation
Should cast type of folio->index from pgoff_t to loff_t to avoid overflow while left shift operation.
Which versions are affected by CVE-2025-40077?
How do I fix CVE-2025-40077?
Apply the vendor's patch.
Is CVE-2025-40077 being exploited?
There is no known exploitation of CVE-2025-40077 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2025-40077, DEBIAN-CVE-2025-40077, GHSA-4hvf-57gh-hgxp, ROOT-OS-DEBIAN-11-CVE-2025-40077, ROOT-OS-DEBIAN-12-CVE-2025-40077, ROOT-OS-DEBIAN-13-CVE-2025-40077 and 3 more.