---
title: "CVE-2026-89685: Linux Kernel - Denial of Service"
description: "Linux kernel contains a denial of service caused by a clock domain mismatch in clients_still_reclaiming(), letting any client hold the NFS server in grace indefinitely by sending CLAIM_PREVIOUS OPEN requests, exploit requires network access to send crafted requests."
url: https://panop.io/threat-heartbeat/CVE-2026-89685/
---

# CVE-2026-89685 Linux Kernel - Denial of Service

Linux kernel contains a denial of service caused by a clock domain mismatch in clients\_still\_reclaiming(), letting any client hold the NFS server in grace indefinitely by sending CLAIM\_PREVIOUS OPEN requests, exploit requires network access to send crafted requests.

CVSS base score 7.5 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.44% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-89685)

## 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 clients\_still\_reclaiming() clock domain mismatch.

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-2026-89685](https://nvd.nist.gov/vuln/detail/CVE-2026-89685)
- [https://git.kernel.org/stable/c/9843649196221152b6e5d138a3ce859bdaae1d96](https://git.kernel.org/stable/c/9843649196221152b6e5d138a3ce859bdaae1d96)
- [https://git.kernel.org/stable/c/f9cec313efb2fd18d962aad738a4892bce806016](https://git.kernel.org/stable/c/f9cec313efb2fd18d962aad738a4892bce806016)
- [https://git.kernel.org/stable/c/e92e80c5b043108029bc729b30d12c37158fb9cb](https://git.kernel.org/stable/c/e92e80c5b043108029bc729b30d12c37158fb9cb)
- [https://git.kernel.org/stable/c/09ea3eb9a518565f5bca386e81b993ed8825f5e8](https://git.kernel.org/stable/c/09ea3eb9a518565f5bca386e81b993ed8825f5e8)

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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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