---
id: CVE-2026-89714
title: >-
  kernel: NFS: fix delegation_hash_table leak when nfs4_server_common_setup()
  fails (CVE-2026-89714)
summary: >-
  A flaw was found in the Linux kernel's Network File System (NFS) component.
  When an NFSv4 mount attempt fails, the nfs4_server_common_setup() function
  does not properly free a memory allocation for the delegation hash table. A
  client that …
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-772
vendor: Red Hat
product: Red Hat OpenShift Container Platform 4
affected:
  - openshift_container_platform 4
published: '2026-09-11'
updated: '2026-09-21'
sourceUpdated: '2026-09-21T17:43:03+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89714.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89714.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89714'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532288'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89714'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89714'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89714.mbox
  - url: 'https://git.kernel.org/stable/c/0fd2b9687dae36be5b84eab39b4c627bb7ab33b3'
  - url: 'https://git.kernel.org/stable/c/2092f5b38f88be306140c77aeeeb43fc1adacacc'
  - url: 'https://git.kernel.org/stable/c/f3adf1643517357221422c05986d6de5df7b9913'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.00198
epssPercentile: 0.09834
ingestedAt: '2026-09-14T11:11:19.885Z'
---

## Overview

A flaw was found in the Linux kernel's Network File System (NFS) component. When an NFSv4 mount attempt fails, the nfs4_server_common_setup() function does not properly free a memory allocation for the delegation hash table. A client that persistently retries a failed mount can exploit this to cause an unbounded kernel memory leak. This can lead to system instability and a Denial of Service (DoS) due to memory exhaustion.

## Vendor advisories

- **Red Hat VEX** · Low · affected: Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat OpenShift Container Platform 4 · updated 2026-09-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89714.json)

**kernel: NFS: fix delegation_hash_table leak when nfs4_server_common_setup() fails** — rated Low by Red Hat. Released 2026-09-11, updated 2026-09-21.

Affected:

- Red Hat OpenShift Container Platform 4

No fix planned:

- Red Hat OpenShift Container Platform 4

## Remediation

Affected