---
id: CVE-2026-89699
title: 'kernel: nfsd: validate symlink target length in NFSv4 CREATE (CVE-2026-89699)'
summary: >-
  A flaw was found in the Linux kernel's Network File System Daemon (nfsd) when
  handling NFSv4 CREATE operations. A remote attacker can exploit this by
  sending a crafted request with an oversized symbolic link (symlink) target
  length. This u…
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cvssSource: vendor
cwe: CWE-770
vendor: Red Hat
product: Red Hat Enterprise Linux 9
affected:
  - enterprise_linux 10
  - enterprise_linux 6
  - enterprise_linux 7
  - enterprise_linux 8
  - enterprise_linux 9
  - openshift_container_platform 4
published: '2026-09-11'
updated: '2026-09-21'
sourceUpdated: '2026-09-21T12:26:02+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89699.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89699.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89699'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532157'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89699'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89699'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89699.mbox
  - url: 'https://git.kernel.org/stable/c/36011308b3f01ce7dc9954f3cefcbb5291af9f95'
  - url: 'https://git.kernel.org/stable/c/888dad4b557352cf85be31613407b5ba51ad07d1'
  - url: 'https://git.kernel.org/stable/c/8661d3cb38fd148947e57dbc0871fd4d3fa33bbf'
  - url: 'https://git.kernel.org/stable/c/3ef5e7a01a4d74995a65496bc9166d1e980a4355'
  - url: 'https://git.kernel.org/stable/c/b24843ea3de1676b29902457b38507c95a80649b'
  - url: 'https://git.kernel.org/stable/c/895a485cd3758031ef9993c0d53cf19ce8fb4ccc'
  - url: 'https://git.kernel.org/stable/c/45ec115cbfecb4b3cfab7fca6f73d1b60696a25a'
  - url: 'https://git.kernel.org/stable/c/041f57056e5fb9c80adc088269322d2c61074406'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
  - score-dispute
epss: 0.00508
epssPercentile: 0.42373
scores:
  vendor: 5.5
  cna: 7.5
ingestedAt: '2026-09-14T15:23:07.449Z'
---

## Overview

A flaw was found in the Linux kernel's Network File System Daemon (nfsd) when handling NFSv4 CREATE operations. A remote attacker can exploit this by sending a crafted request with an oversized symbolic link (symlink) target length. This unbounded length can force the kernel to allocate a large amount of memory, leading to a denial of service (DoS) condition on the system.

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, … · updated 2026-09-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89699.json)

**kernel: nfsd: validate symlink target length in NFSv4 CREATE** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-21.

Affected:

- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4

No fix planned:

- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4

## Remediation

Out of support scope