---
id: CVE-2026-89546
title: >-
  kernel: Linux Kernel: Resource management flaw in SUNRPC NFS callback service
  (CVE-2026-89546)
summary: >-
  A flaw was found in the Linux kernel's SUNRPC (Sun Remote Procedure Call)
  Network File System (NFS) callback service. A race condition during the
  service teardown can lead to system resources not being properly released,
  causing a resource…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H'
cvssSource: vendor
cwe: CWE-911
vendor: Red Hat
product: Red Hat OpenShift Container Platform 4
affected:
  - openshift_container_platform 4
published: '2026-09-11'
updated: '2026-09-13'
sourceUpdated: '2026-09-13T06:57:19+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89546.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89546.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89546'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532175'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89546'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89546'
  - url: 'https://git.kernel.org/stable/c/3674f780f47d2906b5a0f7199b66973067bdfeca'
  - url: 'https://git.kernel.org/stable/c/6debde9e3e6ae21dcca75837b4247b13ca4ea2b8'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
  - score-dispute
epss: 0.00553
epssPercentile: 0.4378
scores:
  vendor: 5.3
  cna: 9.8
ingestedAt: '2026-09-14T15:23:07.474Z'
---

## Overview

A flaw was found in the Linux kernel's SUNRPC (Sun Remote Procedure Call) Network File System (NFS) callback service. A race condition during the service teardown can lead to system resources not being properly released, causing a resource leak. This issue could also result in a use-after-free vulnerability, where the system attempts to access memory that has already been deallocated. An attacker could potentially exploit this vulnerability to cause a denial of service, making the affected system unstable or unresponsive.

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat OpenShift Container Platform 4 · updated 2026-09-13 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89546.json)

**kernel: Linux Kernel: Resource management flaw in SUNRPC NFS callback service** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-13.

Affected:

- Red Hat OpenShift Container Platform 4

No fix planned:

- Red Hat OpenShift Container Platform 4

## Remediation

Fix deferred