---
id: CVE-2026-89702
title: >-
  kernel: nfsd: size fh_verify server sockaddr slot by xpt_locallen
  (CVE-2026-89702)
summary: >-
  A flaw was found in the Linux kernel's Network File System Daemon (nfsd). When
  processing NFSv2/v3-over-UDP requests, the `nfsd_fh_verify` and
  `nfsd_fh_verify_err` tracepoints incorrectly size a memory buffer. This can
  lead to an out-of-bo…
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-787
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: '2026-09-15'
sourceUpdated: '2026-09-15T15:02:31+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89702.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89702.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89702'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532472'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89702'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89702'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89702.mbox
  - url: 'https://git.kernel.org/stable/c/719a10e3f5f868c3c4ac3cf3648c5775d12034bd'
  - url: 'https://git.kernel.org/stable/c/71d068490098b1d23c63b2345e40675d3a1ca763'
  - url: 'https://git.kernel.org/stable/c/7ff8d6363cffff45654ea85e319f7c0c54226012'
  - url: 'https://git.kernel.org/stable/c/95d064f9828a20ccca5ae90a17be3e2076f25272'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
  - score-dispute
epss: 0.00671
epssPercentile: 0.49861
scores:
  vendor: 7
  cna: 9.8
ingestedAt: '2026-09-14T15:23:07.472Z'
---

## Overview

A flaw was found in the Linux kernel's Network File System Daemon (nfsd). When processing NFSv2/v3-over-UDP requests, the `nfsd_fh_verify` and `nfsd_fh_verify_err` tracepoints incorrectly size a memory buffer. This can lead to an out-of-bounds write, potentially allowing a remote attacker to cause a denial of service or disclose sensitive information from the kernel's ring buffer.

## 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 2026-09-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89702.json)

**kernel: nfsd: size fh_verify server sockaddr slot by xpt_locallen** — 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 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

## Remediation

Out of support scope