CVE-2025-22000 mm/huge_memory: drop beyond-EOF folios with the right number of refs
A memory leak in the Linux kernel huge memory subsystem can cause resource exhaustion and denial of service when truncating files on filesystems with block sizes larger than page size.
- 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-2025-22000?
CVE-2025-22000 is a medium-severity denial of service vulnerability in Linux kernel, published on 3 Apr 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:
mm/huge_memory: drop beyond-EOF folios with the right number of refs
When an after-split folio is large and needs to be dropped due to EOF, folio_put_refs(folio, folio_nr_pages(folio)) should be used to drop all page cache refs. Otherwise, the folio will not be freed, causing memory leak.
This leak would happen on a filesystem with blocksize > page_size and a truncate is performed, where the blocksize makes folios split to >0 order ones, causing truncated folios not being freed.
Weakness: CWE-401
Which versions are affected by CVE-2025-22000?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2025-22000?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2025-22000 being exploited?
There is no known exploitation of CVE-2025-22000 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2025-22000, DEBIAN-CVE-2025-22000, GHSA-84gc-cf68-frm5, UBUNTU-CVE-2025-22000.