---
title: "CVE-2026-89679: Linux Kernel - Denial of Service"
description: "Linux kernel contains a null pointer dereference in nfsd4_setattr caused by improper handling of special NFSv4 stateid in delegation timestamp attributes, letting remote NFSv4 clients cause kernel crash without authentication."
url: https://panop.io/threat-heartbeat/CVE-2026-89679/
---

# CVE-2026-89679 Linux Kernel - Denial of Service

Linux kernel contains a null pointer dereference in nfsd4\_setattr caused by improper handling of special NFSv4 stateid in delegation timestamp attributes, letting remote NFSv4 clients cause kernel crash without authentication.

CVSS base score 7.5 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.72% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-89679)

## Details

Type

Denial of Service

Impact

Denial Of Service

CVSS vector

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

Published

11 September 2026

Updated

15 October 2026

## Vendor fix

Update to the latest Linux kernel version with the fix for nfsd4\_setattr null pointer dereference.

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-2026-89679](https://nvd.nist.gov/vuln/detail/CVE-2026-89679)
- [https://git.kernel.org/stable/c/3c5119b799a7f57db332b2c31e806de16c869f0f](https://git.kernel.org/stable/c/3c5119b799a7f57db332b2c31e806de16c869f0f)
- [https://git.kernel.org/stable/c/3c896db123892256fd39af0ee8c2d02c63539983](https://git.kernel.org/stable/c/3c896db123892256fd39af0ee8c2d02c63539983)
- [https://git.kernel.org/stable/c/fe456c8c0931bb3e8a03d429920e87fd85747fba](https://git.kernel.org/stable/c/fe456c8c0931bb3e8a03d429920e87fd85747fba)

[← 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)