---
title: "CVE-2026-89841: Linux kernel f2fs - Denial of Service"
description: "Linux kernel f2fs contains a bug caused by improper handling of folio references in redirty_blocks, letting attackers cause a bad page state leading to potential denial of service, exploit requires readahead to populate page cache."
url: https://panop.io/threat-heartbeat/CVE-2026-89841/
---

# CVE-2026-89841 Linux kernel f2fs - Denial of Service

Linux kernel f2fs contains a bug caused by improper handling of folio references in redirty\_blocks, letting attackers cause a bad page state leading to potential denial of service, exploit requires readahead to populate page cache.

CVSS base score 7.8 /10

High

CISA KEV

Not listed

Public exploit

None known

EPSS

0.17% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-89841)

## Details

Type

Denial of Service

Impact

Denial Of Service

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Published

16 September 2026

Updated

15 October 2026

## Vendor fix

Update to the latest Linux kernel version containing the fix for redirty\_blocks folio handling.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-89841](https://nvd.nist.gov/vuln/detail/CVE-2026-89841)
- [https://git.kernel.org/stable/c/445e4a1e6025ecd5312e9a95c1b234192c976ca1](https://git.kernel.org/stable/c/445e4a1e6025ecd5312e9a95c1b234192c976ca1)
- [https://git.kernel.org/stable/c/85171332742e741ccd6f401c69b6e0d698119e72](https://git.kernel.org/stable/c/85171332742e741ccd6f401c69b6e0d698119e72)
- [https://git.kernel.org/stable/c/89c65ec3c18903de763cf567c96ab3ef60e5f3b0](https://git.kernel.org/stable/c/89c65ec3c18903de763cf567c96ab3ef60e5f3b0)

[← All CVEs](https://panop.io/threat-heartbeat/)

## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

[Book a demo](https://panop.io/demo)