Medium [CVE-2026-89092] nscd stack overflow leads to degraded DNS resolution
This medium-severity Red Hat Linux advisory covers CVE-2026-89092 affecting Red Hat Hardened Images, Red Hat OpenShift Container Platform 4.
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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, causing it to crash and leading to degraded DNS resolution for the system. There is also a remote possibility of nscd cache corruption.
Red Hat severity: Moderate — CVSS 4.2 (CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L). Weakness: CWE-120.
Affected Red Hat products: Red Hat Hardened Images; Red Hat OpenShift Container Platform 4. Red Hat does not currently list a fixing RHSA for this CVE.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · medium-confidence parse· fetched 23 minutes ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · medium-confidence parse· fetched 23 minutes ago·verify at source
Mitigation
The source record does not include mitigation steps. That is not a statement that no fix exists — read the vendor advisory below for the authoritative guidance.
Official advisory · medium-confidence parse· fetched 23 minutes ago·verify at source
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