---
title: "CVE-2026-89695: Linux Kernel - Denial of Service"
description: "Linux kernel contains a denial of service vulnerability in nfsd4_decode_posixacl() caused by uncapped POSIX ACL entry count leading to unbounded CPU usage in sort_pacl_range(), letting remote attackers cause high CPU load, exploit requires crafted NFS requests."
url: https://panop.io/threat-heartbeat/CVE-2026-89695/
---

# CVE-2026-89695 Linux Kernel - Denial of Service

Linux kernel contains a denial of service vulnerability in nfsd4\_decode\_posixacl() caused by uncapped POSIX ACL entry count leading to unbounded CPU usage in sort\_pacl\_range(), letting remote attackers cause high CPU load, exploit requires crafted NFS requests.

CVSS base score 7.5 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.49% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-89695)

## 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 NFS ACL entry count validation.

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-2026-89695](https://nvd.nist.gov/vuln/detail/CVE-2026-89695)
- [https://git.kernel.org/stable/c/4bc1108e876153a2dd6d874052b99182c3603135](https://git.kernel.org/stable/c/4bc1108e876153a2dd6d874052b99182c3603135)
- [https://git.kernel.org/stable/c/ea14d71d6ecb925673761bcf79f781f7dc9042cc](https://git.kernel.org/stable/c/ea14d71d6ecb925673761bcf79f781f7dc9042cc)

[← 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)