---
id: CVE-2026-89683
title: >-
  kernel: nfsd: fix dentry ref leak on V4ROOT export filehandle lookup
  (CVE-2026-89683)
summary: >-
  A flaw was found in the Linux kernel's nfsd (NFS daemon). A remote attacker
  could exploit this vulnerability by sending a specially crafted NFSv3
  filehandle targeting a V4ROOT export's file system identifier (fsid). This
  action triggers a …
severity: high
cvss: 7
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'
cvssSource: vendor
cwe: CWE-911
vendor: Red Hat
product: Red Hat Enterprise Linux 10
affected:
  - enterprise_linux 10
  - enterprise_linux 6
published: '2026-09-11'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T10:08:24+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89683.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89683.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89683'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532313'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89683'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89683'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89683.mbox
  - url: 'https://git.kernel.org/stable/c/11db8df188b34bdb8c6a3a0bf438e5fc8cd75aca'
  - url: 'https://git.kernel.org/stable/c/6247023fbbec1325029f2d5f2a7cdc0f9f9ea15a'
  - url: 'https://git.kernel.org/stable/c/c1ae0f973bcba5730871e35976a0ab6878fdac34'
  - url: 'https://git.kernel.org/stable/c/d493cf57f4c4dae5396cd6ad41e5c209d0615a81'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.00175
epssPercentile: 0.07301
ingestedAt: '2026-09-14T11:11:19.885Z'
---

## Overview

A flaw was found in the Linux kernel's nfsd (NFS daemon). A remote attacker could exploit this vulnerability by sending a specially crafted NFSv3 filehandle targeting a V4ROOT export's file system identifier (fsid). This action triggers a dentry reference leak, which can lead to resource exhaustion and ultimately result in a Denial of Service (DoS) on the affected system.

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10 · updated 2026-09-16 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89683.json)

**kernel: nfsd: fix dentry ref leak on V4ROOT export filehandle lookup** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-16.

Affected:

- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 6

No fix planned:

- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 10

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