---
id: CVE-2026-89688
title: >-
  kernel: nfsd: drop the stateid, not the stateowner, on seqid_op replay retry
  (CVE-2026-89688)
summary: >-
  A flaw was found in the Linux kernel's nfsd component. During a `seqid_op`
  replay retry, the system incorrectly handles reference counts for stateowners,
  leading to a reference count underflow and a use-after-free vulnerability.
  This issue…
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-825
vendor: Red Hat
product: Red Hat Enterprise Linux 9
affected:
  - enterprise_linux 10
  - enterprise_linux 6
  - enterprise_linux 9
  - openshift_container_platform 4
published: '2026-09-11'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T04:38:12+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89688.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89688.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89688'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532337'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89688'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89688'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89688.mbox
  - url: 'https://git.kernel.org/stable/c/00843074d9b84824552c9679d423d29500ca5de0'
  - url: 'https://git.kernel.org/stable/c/5e4627d3513e60accfce9d5f4c7fa95251ef93d6'
  - url: 'https://git.kernel.org/stable/c/69ed78b6b947c9257213164678b4edf17533093b'
  - url: 'https://git.kernel.org/stable/c/f7cb90ddc021747fc9abfd4cf5252d425fd34eec'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
  - score-dispute
epss: 0.00608
epssPercentile: 0.47808
scores:
  vendor: 5.3
  cna: 9.8
ingestedAt: '2026-09-14T15:23:07.473Z'
---

## Overview

A flaw was found in the Linux kernel's nfsd component. During a `seqid_op` replay retry, the system incorrectly handles reference counts for stateowners, leading to a reference count underflow and a use-after-free vulnerability. This issue could allow an attacker to potentially cause a denial of service or execute arbitrary code.

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, 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 9, Red Hat OpenShift Container Platform 4 · updated 2026-09-16 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89688.json)

**kernel: nfsd: drop the stateid, not the stateowner, on seqid_op replay retry** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-16.

Affected:

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

Not affected:

- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat OpenShift Container Platform 4

## Remediation

Out of support scope