---
id: CVE-2026-89673
title: >-
  kernel: nfsd: fix XDR padding calculation in ff_encode_getdeviceinfo
  (CVE-2026-89673)
summary: >-
  A flaw was found in the Linux kernel's NFS daemon (nfsd). A remote attacker
  could exploit an error in the XDR (External Data Representation) padding
  calculation within the `ff_encode_getdeviceinfo` function. This mismatch
  between reserved …
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-125
vendor: Red Hat
product: Red Hat OpenShift Container Platform 4
affected:
  - openshift_container_platform 4
published: '2026-09-11'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T12:14:07+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89673.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89673.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89673'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532322'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89673'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89673'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89673.mbox
  - url: 'https://git.kernel.org/stable/c/41ebca28e17f84293650598f86bd69532ec1a8e0'
  - url: 'https://git.kernel.org/stable/c/62e5949f0dd5ec837af144860ff908369df4c7c9'
  - url: 'https://git.kernel.org/stable/c/74015b7be806ad9e21d46f7bd2831df280c6c783'
  - url: 'https://git.kernel.org/stable/c/8b989aaec85e1293a871d602590c951fe44b8647'
  - url: 'https://git.kernel.org/stable/c/88bce7e326c368d7df15126ccac537e54bebd467'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.002
epssPercentile: 0.10104
ingestedAt: '2026-09-14T15:23:07.450Z'
---

## Overview

A flaw was found in the Linux kernel's NFS daemon (nfsd). A remote attacker could exploit an error in the XDR (External Data Representation) padding calculation within the `ff_encode_getdeviceinfo` function. This mismatch between reserved and actual data size leads to the leakage of stale reply-page content to the client, potentially disclosing sensitive information. It also causes misalignment in subsequent data decoding.

## Vendor advisories

- **Red Hat VEX** · Moderate · updated 2026-09-16 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89673.json)

**kernel: nfsd: fix XDR padding calculation in ff_encode_getdeviceinfo** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-16.

Not affected:

- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4

## Remediation

Refer to the advisory for fix availability.