---
title: "CVE-2026-89836: Linux Kernel f2fs - Race Condition"
description: "Linux kernel f2fs contains a race condition caused by calling folio_nr_pages() after dropping folio reference in large folio invalidate, letting attackers cause livelock and stale xarray entries, exploit requires concurrent folio operations."
url: https://panop.io/threat-heartbeat/CVE-2026-89836/
---

# CVE-2026-89836 Linux Kernel f2fs - Race Condition

Linux kernel f2fs contains a race condition caused by calling folio\_nr\_pages() after dropping folio reference in large folio invalidate, letting attackers cause livelock and stale xarray entries, exploit requires concurrent folio operations.

CVSS base score 7.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.17% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-89836)

## Details

Type

Race Condition

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 Linux kernel version that includes the fix for folio\_nr\_pages() race in f2fs, such as v6.18 or later.

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-2026-89836](https://nvd.nist.gov/vuln/detail/CVE-2026-89836)
- [https://git.kernel.org/stable/c/0dab71381f1b4d12dc2056f8bd5aaa9d93ce9082](https://git.kernel.org/stable/c/0dab71381f1b4d12dc2056f8bd5aaa9d93ce9082)
- [https://git.kernel.org/stable/c/cc34df18da92f68f9b384c3ae95ad64be46cb5ee](https://git.kernel.org/stable/c/cc34df18da92f68f9b384c3ae95ad64be46cb5ee)

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## 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

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