---
title: "CVE-2026-89696: Linux Kernel nfsd - Denial of Service"
description: "Linux kernel nfsd with CONFIG_NFSD_V4_2_INTER_SSC enabled contains a NULL pointer dereference caused by improper handling of FOREIGN PUTFH in nfsd4_putfh, letting remote clients cause a denial of service via crafted COMPOUND requests, exploit requires crafted inter-SSC COPY with inserted operations."
url: https://panop.io/threat-heartbeat/CVE-2026-89696/
---

# CVE-2026-89696 Linux Kernel nfsd - Denial of Service

Linux kernel nfsd with CONFIG\_NFSD\_V4\_2\_INTER\_SSC enabled contains a NULL pointer dereference caused by improper handling of FOREIGN PUTFH in nfsd4\_putfh, letting remote clients cause a denial of service via crafted COMPOUND requests, exploit requires crafted inter-SSC COPY with inserted operations.

CVSS base score 7.5 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.75% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-89696)

## 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 containing the fix for this issue.

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-2026-89696](https://nvd.nist.gov/vuln/detail/CVE-2026-89696)
- [https://git.kernel.org/stable/c/bf4d338dc8625d70c7f2cb0657d66851a7ac9154](https://git.kernel.org/stable/c/bf4d338dc8625d70c7f2cb0657d66851a7ac9154)
- [https://git.kernel.org/stable/c/c59738a00aa51b16adc1b5ceb7c80877168efb4d](https://git.kernel.org/stable/c/c59738a00aa51b16adc1b5ceb7c80877168efb4d)
- [https://git.kernel.org/stable/c/00c84f4eec715e501efc080a5670114189e42507](https://git.kernel.org/stable/c/00c84f4eec715e501efc080a5670114189e42507)
- [https://git.kernel.org/stable/c/2d9846fd1c767920fddd4bde30eb35cd2969df13](https://git.kernel.org/stable/c/2d9846fd1c767920fddd4bde30eb35cd2969df13)
- [https://git.kernel.org/stable/c/977e6f006a7a3ffc4216ae6034f768f8de6fd138](https://git.kernel.org/stable/c/977e6f006a7a3ffc4216ae6034f768f8de6fd138)
- [https://git.kernel.org/stable/c/ffdc844e673d2bcb2af8c8c3eef8cdea59d0bf32](https://git.kernel.org/stable/c/ffdc844e673d2bcb2af8c8c3eef8cdea59d0bf32)
- [https://git.kernel.org/stable/c/311f7d926630940650447cbd1c932b076b40a6c4](https://git.kernel.org/stable/c/311f7d926630940650447cbd1c932b076b40a6c4)
- [https://git.kernel.org/stable/c/35f248bd40b47b229d4999581df45b97daadd977](https://git.kernel.org/stable/c/35f248bd40b47b229d4999581df45b97daadd977)

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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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