---
id: CVE-2026-89541
title: 'kernel: SUNRPC: harden gss_unwrap_resp_priv length checks (CVE-2026-89541)'
summary: >-
  A flaw was found in the Linux kernel. Specifically, an integer overflow
  vulnerability exists in the `gss_unwrap_resp_priv()` function within the
  SUNRPC component. This flaw occurs when validating the length of RPCSEC_GSS
  opaque data. A mal…
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-125
vendor: Red Hat
product: Red Hat Enterprise Linux 9
affected:
  - enterprise_linux 10
  - enterprise_linux 6
  - enterprise_linux 7
  - enterprise_linux 8
  - enterprise_linux 9
  - openshift_container_platform 4
published: '2026-09-11'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T21:56:11+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89541.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89541.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89541'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532224'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89541'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89541'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89541.mbox
  - url: 'https://git.kernel.org/stable/c/3691c4b3488d8ca046b9941e5be30c626dbbbb50'
  - url: 'https://git.kernel.org/stable/c/85fa6b12e8f439739ac36ef2aad925f37c8b976a'
  - url: 'https://git.kernel.org/stable/c/401f6a5b338d05bb1069ad814d9f77e3c367854f'
  - url: 'https://git.kernel.org/stable/c/81fd7654a8429718adfcb2a7e03496077f547ed0'
  - url: 'https://git.kernel.org/stable/c/89a15a50f84d32d4b99db86f957427fcbe20a99a'
  - url: 'https://git.kernel.org/stable/c/ebcbd2523a8524c3d24e111cdbed8e271d910269'
  - url: 'https://git.kernel.org/stable/c/d395c30d570ca6168f0297b191709927d1258273'
  - url: 'https://git.kernel.org/stable/c/87831b92112c81db251d46756d65daa4f91af6a2'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
  - score-dispute
epss: 0.00521
epssPercentile: 0.43234
scores:
  vendor: 7
  cna: 9.8
ingestedAt: '2026-09-14T15:23:07.452Z'
---

## Overview

A flaw was found in the Linux kernel. Specifically, an integer overflow vulnerability exists in the `gss_unwrap_resp_priv()` function within the SUNRPC component. This flaw occurs when validating the length of RPCSEC_GSS opaque data. A malicious krb5p Network File System (NFS) server can send a specially crafted RPCSEC_GSS reply, leading to an out-of-bounds read. This could potentially result in information disclosure or a denial of service (DoS) on the client system.

## Vendor advisories

- **Red Hat VEX** · Moderate · 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 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, … · updated 2026-09-18 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89541.json)

**kernel: SUNRPC: harden gss_unwrap_resp_priv length checks** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-18.

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

No fix planned:

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