CVE-2026-80897 netfs: release readahead folios on iterator preparation failure
A memory leak in the Linux kernel netfs module can lead to resource exhaustion and denial of service when iterator preparation fails.
- 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-2026-80897?
CVE-2026-80897 is a memory corruption vulnerability in Linux, published on 4 Sep 2026. 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:
netfs: release readahead folios on iterator preparation failure
netfs_prepare_read_iterator() batches readahead folios in put_batch so that the folio references can be dropped after the I/O iterator has been prepared.
If rolling_buffer_load_from_ra() fails after earlier folios have been batched, the function returns immediately and leaves those references held. Release the batch before returning the error.
Which versions are affected by CVE-2026-80897?
How do I fix CVE-2026-80897?
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-2026-80897 being exploited?
There is no known exploitation of CVE-2026-80897 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-80897, DEBIAN-CVE-2026-80897, GHSA-2r8v-7c33-hcr2, UBUNTU-CVE-2026-80897.