---
id: CVE-2026-89690
title: >-
  kernel: nfsd: defer vfree of compound ops to fix rpc_status UAF
  (CVE-2026-89690)
summary: >-
  A flaw was found in the `nfsd` component of the Linux kernel. This
  vulnerability, a use-after-free, occurs when a specific memory buffer is
  prematurely released while another process is still trying to access it. This
  timing issue can lead…
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 9
  - openshift_container_platform 4
  - enterprise_linux 6
published: '2026-09-11'
updated: '2026-09-21'
sourceUpdated: '2026-09-21T11:41:24+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89690.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89690.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89690'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532103'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89690'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89690'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89690.mbox
  - url: 'https://git.kernel.org/stable/c/19413ccc45070a7270b9e25c2a258daf7f91de42'
  - url: 'https://git.kernel.org/stable/c/48f72aff24f7a7329209dc6cbc27c869f3e3595c'
  - url: 'https://git.kernel.org/stable/c/6703199f4d7e7f37d6a726a849eb358e8fae72fb'
  - url: 'https://git.kernel.org/stable/c/fca26a3fc19ed02278aa2a150af82d43db0302cb'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.0017
epssPercentile: 0.05577
scores:
  vendor: 8.1
  cna: 7.8
ingestedAt: '2026-09-14T15:23:07.473Z'
---

## Overview

A flaw was found in the `nfsd` component of the Linux kernel. This vulnerability, a use-after-free, occurs when a specific memory buffer is prematurely released while another process is still trying to access it. This timing issue can lead to memory corruption. This could result in a system crash (denial of service) or potentially allow an attacker to gain elevated privileges.

## Vendor advisories

- **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4, Red Hat Enterprise Linux 6 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-09-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89690.json)

**kernel: nfsd: defer vfree of compound ops to fix rpc_status UAF** — rated Important by Red Hat. Released 2026-09-11, updated 2026-09-21.

Affected:

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

No fix planned:

- 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

Affected