---
id: CVE-2026-89092
title: 'glibc: nscd stack overflow leads to degraded DNS resolution (CVE-2026-89092)'
summary: >-
  A flaw was found in glibc, specifically within the nscd service. A remote
  attacker, operating a malicious Domain Name System (DNS) server, could send an
  overly large DNS response. This could trigger a stack overflow in the nscd
  service, ca…
severity: medium
cvss: 4.2
cvssVector: 'CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L'
cvssSource: vendor
cwe:
  - CWE-120
  - CWE-789
vendor: Red Hat
product: Red Hat Enterprise Linux 9
affected:
  - enterprise_linux 6
  - enterprise_linux 7
  - enterprise_linux 8
  - enterprise_linux 9
  - hardened_images
  - openshift_container_platform 4
published: '2026-09-11'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T21:13:33+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89092.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89092.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89092'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2531725'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89092'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89092'
  - url: 'https://sourceware.org/bugzilla/show_bug.cgi?id=34624'
  - url: >-
      https://sourceware.org/git/?p=glibc.git;a=blob_plain;f=advisories/GLIBC-SA-2026-0016
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.00241
epssPercentile: 0.1552
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-11T16:57:22.665457Z'
ingestedAt: '2026-09-14T00:35:28.536Z'
---

## Overview

A flaw was found in glibc, specifically within the nscd service. A remote attacker, operating a malicious Domain Name System (DNS) server, could send an overly large DNS response. This could trigger a stack overflow in the nscd service, causing it to crash and leading to degraded DNS resolution for the system. There is also a remote possibility of nscd cache corruption.

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat Hardened Images, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat OpenShift Container Platform 4, … · updated 2026-09-18 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89092.json)

**glibc: nscd stack overflow leads to degraded DNS resolution** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-18.

Affected:

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

No fix planned:

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

Not affected:

- Red Hat Enterprise Linux 10

## Remediation

Fix deferred