---
id: CVE-2026-89692
title: >-
  kernel: nfsd: clear CALLBACK_RUNNING on failed delegation recall queue
  (CVE-2026-89692)
summary: >-
  A flaw was found in the Linux kernel's Network File System (NFS) daemon,
  `nfsd`. This vulnerability occurs when a delegation recall operation fails,
  leaving a critical internal flag uncleared. This prevents subsequent attempts
  to break the…
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-911
vendor: Red Hat
product: Red Hat Enterprise Linux 10
affected:
  - enterprise_linux 10
  - enterprise_linux 6
  - openshift_container_platform 4
published: '2026-09-11'
updated: '2026-09-15'
sourceUpdated: '2026-09-15T14:05:57+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89692.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89692.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89692'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532481'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89692'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89692'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89692.mbox
  - url: 'https://git.kernel.org/stable/c/b036727d334b1b7cd4c1f1fba3b59ba93a6bbe96'
  - url: 'https://git.kernel.org/stable/c/b137930ee52e3ef38915a3511d4c070463b63a32'
  - url: 'https://git.kernel.org/stable/c/cb2d0c4d1b3d301d042ed61365eaa8cb0141a254'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
  - score-dispute
epss: 0.00609
epssPercentile: 0.46858
scores:
  vendor: 5.3
  cna: 7.5
ingestedAt: '2026-09-14T15:23:07.473Z'
---

## Overview

A flaw was found in the Linux kernel's Network File System (NFS) daemon, `nfsd`. This vulnerability occurs when a delegation recall operation fails, leaving a critical internal flag uncleared. This prevents subsequent attempts to break the same delegation, leading to a denial of service where file operations or locks can stall indefinitely. This can disrupt access to shared network resources.

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10, Red Hat OpenShift Container Platform 4 · updated 2026-09-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89692.json)

**kernel: nfsd: clear CALLBACK_RUNNING on failed delegation recall queue** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-15.

Affected:

- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 6
- Red Hat OpenShift Container Platform 4

No fix planned:

- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 10
- Red Hat OpenShift Container Platform 4

Not affected:

- 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