Unity Linux 20.1070e Security Update: glibc (UTSA-2026-151009)

medium Nessus Plugin ID 377759

Synopsis

The Unity Linux host is missing one or more security updates.

Description

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-151009 advisory.

The nscd service in the GNU C Library 2.3.4 onwards may crash due to a stack overflow when a malicious DNS server returns too large a response for a DNS query, resulting in degraded DNS resolution for the system.

Exploitation of this bug needs a system that has nscd enabled and using an untrusted DNS server for name resolution, with the compromised DNS server being capable of processing records large enough to result in a stack overflow in an nscd thread stack. During experimentation, bind 9 was unable to handle large records, but that could change in future or with a different name server. In typical installations, nscd is executed in an isolated context as its own user without a shell, due to which any compromise of that service is isolated.

There is a remote possibility of nscd cache corruption if an attacker manages to get the stack pointer into a desired point in the heap, potentially resulting in other caches in nscd being overwritten with corrupt data through the stack overflow, until the buggy code path eventually results in a crash.

Finally, a crash in nscd may result in performance degradation when resolving names, but it does not result in a denial of service.

Tenable has extracted the preceding description block directly from the Unity Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Update the affected glibc package.

Plugin Details

Severity: Medium

ID: 377759

File Name: unity_linux_UTSA-2026-151009.nasl

Version: 1.1

Type: Local

Family: Unity Linux Local Security Checks

Published: 11/9/2026

Updated: 11/9/2026

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Low

Score: 2.1

Percentile: 8.16

CVSS v2

Risk Factor: Low

Base Score: 3.2

Temporal Score: 2.4

Vector: CVSS2#AV:A/AC:H/Au:N/C:N/I:P/A:P

CVSS Score Source: CVE-2026-89092

CVSS v3

Risk Factor: Medium

Base Score: 4.2

Temporal Score: 3.7

Vector: CVSS:3.0/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Required KB Items: Host/local_checks_enabled, Host/cpu, Host/UOS-Server/release, Host/UOS-Server/rpm-list

Exploit Ease: No known exploits are available

Patch Publication Date: 11/9/2026

Vulnerability Publication Date: 9/11/2026

Reference Information

CVE: CVE-2026-89092

Detections

Analytics