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CentOS Linux 6 [TuxCare] Security Update: glibc / glibc-common / glibc-devel / glibc-headers / glibc-static / etc Multiple Vulnerabilities (CENTOS6:CLSA-2026:1776605836)

critical Nessus Plugin ID 352827

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Synopsis

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

Description

The CentOS Linux 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the TuxCare CENTOS6:CLSA-2026:1776605836 advisory.

 - In glibc 2.26 and earlier there is confusion in the usage of getcwd() by realpath() which can be used to write before the destination buffer leading to a buffer underflow and potential code execution.
 (CVE-2018-1000001)

 - In the GNU C Library (aka glibc or libc6) through 2.28, attempting to resolve a crafted hostname via getaddrinfo() leads to the allocation of a socket descriptor that is not closed. This is related to the if_nametoindex() function. (CVE-2018-19591)

 - An integer overflow in the implementation of the posix_memalign in memalign functions in the GNU C Library (aka glibc or libc6) 2.26 and earlier could cause these functions to return a pointer to a heap area that is too small, potentially leading to heap corruption. (CVE-2018-6485)

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

Solution

Update the affected packages based on the guidance in TuxCare advisory CENTOS6:CLSA-2026:1776605836.

See Also

https://cve.tuxcare.com/els/releases/CLSA-2026:1776605836

http://www.nessus.org/u?66c357b5

Plugin Details

Severity: Critical

ID: 352827

File Name: tuxcare_centos_6_CLSA-2026-1776605836.nasl

Version: 1.2

Type: Local

Agent: unix

Published: 9/30/2026

Updated: 10/1/2026

Supported Sensors: Continuous Assessment, Nessus Agent, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: High

Score: 7.9

Percentile: 99.35

Vendor

Vendor Severity: Critical

CVSS v2

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.2

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

CVSS Score Source: CVE-2018-6485

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 9.1

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

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

Vulnerability Information

Required KB Items: Host/OS/extended-third-party, Host/local_checks_enabled, Host/CentOS/release, Host/CentOS/rpm-list

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 4/19/2026

Vulnerability Publication Date: 1/11/2018

Exploitable With

Metasploit (glibc realpath() Privilege Escalation)

Reference Information

CVE: CVE-2018-1000001, CVE-2018-19591, CVE-2018-6485

CLSA: 2026:1776605836