---
title: "CVE-2026-89678: Linux Kernel - Data Tampering"
description: "Linux kernel contains a data tampering vulnerability in nfsd_direct_write caused by incorrect partial-write detection, letting attackers cause file offset corruption and data over-reporting, exploit requires NFS client interaction."
url: https://panop.io/threat-heartbeat/CVE-2026-89678/
---

# CVE-2026-89678 Linux Kernel - Data Tampering

Linux kernel contains a data tampering vulnerability in nfsd\_direct\_write caused by incorrect partial-write detection, letting attackers cause file offset corruption and data over-reporting, exploit requires NFS client interaction.

CVSS base score 7.5 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.38% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-89678)

## Details

Type

Data Tampering

Impact

Data Tampering

CVSS vector

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

Published

11 September 2026

Updated

15 October 2026

## Vendor fix

Update to the latest Linux kernel version containing the fix for nfsd\_direct\_write partial-write detection.

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-2026-89678](https://nvd.nist.gov/vuln/detail/CVE-2026-89678)
- [https://git.kernel.org/stable/c/250ec14932d5cfe102f68a57892bb566eee7f83e](https://git.kernel.org/stable/c/250ec14932d5cfe102f68a57892bb566eee7f83e)
- [https://git.kernel.org/stable/c/fa6590dfd16ab55f03b658b079072ace3504825e](https://git.kernel.org/stable/c/fa6590dfd16ab55f03b658b079072ace3504825e)

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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

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

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