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Amazon Linux 2 : pcp, --advisory ALAS2-2026-3857 (ALAS-2026-3857)

high Nessus Plugin ID 337232

Synopsis

The remote Amazon Linux 2 host is missing a security update.

Description

The version of pcp installed on the remote host is prior to 4.3.2-12. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2026-3857 advisory.

 A flaw in the PCP linux_sockets module exposes an unsecured internal connection.An attacker with initial code execution can exploit this to escalate privileges and execute arbitrary commands as root.
 (CVE-2026-16526)

 A signed integer overflow in the PCP __pmGetPDU() function can be exploited via crafted network packets during PDU processing or SASL negotiation. This permanently blinds the affected daemon, resulting in a total denial of service (DoS) for subsequent packet reads. (CVE-2026-16529)

Tenable has extracted the preceding description block directly from the tested product security advisory.

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

Solution

Run 'yum update pcp' or or 'yum update --advisory ALAS2-2026-3857' to update your system.

See Also

https://alas.aws.amazon.com//AL2/ALAS2-2026-3857.html

https://alas.aws.amazon.com/faqs.html

https://explore.alas.aws.amazon.com/CVE-2026-16526.html

https://explore.alas.aws.amazon.com/CVE-2026-16529.html

Plugin Details

Severity: High

ID: 337232

File Name: al2_ALAS-2026-3857.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 8/18/2026

Updated: 8/18/2026

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

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.15

CVSS v2

Risk Factor: High

Base Score: 9

Temporal Score: 6.7

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

CVSS Score Source: CVE-2026-16526

CVSS v3

Risk Factor: High

Base Score: 8.8

Temporal Score: 7.7

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

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

Vulnerability Information

CPE: cpe:/o:amazon:linux:2, p-cpe:/a:amazon:linux:pcp-conf, p-cpe:/a:amazon:linux:pcp-debuginfo, p-cpe:/a:amazon:linux:pcp-devel, p-cpe:/a:amazon:linux:pcp-doc, p-cpe:/a:amazon:linux:pcp-export-pcp2elasticsearch, p-cpe:/a:amazon:linux:pcp-export-pcp2graphite, p-cpe:/a:amazon:linux:pcp-export-pcp2influxdb, p-cpe:/a:amazon:linux:pcp-export-pcp2json, p-cpe:/a:amazon:linux:pcp-export-pcp2spark, p-cpe:/a:amazon:linux:pcp-export-pcp2xml, p-cpe:/a:amazon:linux:pcp-export-pcp2zabbix, p-cpe:/a:amazon:linux:pcp-export-zabbix-agent, p-cpe:/a:amazon:linux:pcp-gui, p-cpe:/a:amazon:linux:pcp-import-collectl2pcp, p-cpe:/a:amazon:linux:pcp-import-ganglia2pcp, p-cpe:/a:amazon:linux:pcp-import-iostat2pcp, p-cpe:/a:amazon:linux:pcp-import-mrtg2pcp, p-cpe:/a:amazon:linux:pcp-import-sar2pcp, p-cpe:/a:amazon:linux:pcp-libs-devel, p-cpe:/a:amazon:linux:pcp-libs, p-cpe:/a:amazon:linux:pcp-manager, p-cpe:/a:amazon:linux:pcp-pmda-activemq, p-cpe:/a:amazon:linux:pcp-pmda-apache, p-cpe:/a:amazon:linux:pcp-pmda-bash, p-cpe:/a:amazon:linux:pcp-pmda-bind2, p-cpe:/a:amazon:linux:pcp-pmda-bonding, p-cpe:/a:amazon:linux:pcp-pmda-cifs, p-cpe:/a:amazon:linux:pcp-pmda-cisco, p-cpe:/a:amazon:linux:pcp-pmda-dbping, p-cpe:/a:amazon:linux:pcp-pmda-dm, p-cpe:/a:amazon:linux:pcp-pmda-docker, p-cpe:/a:amazon:linux:pcp-pmda-ds389, p-cpe:/a:amazon:linux:pcp-pmda-ds389log, p-cpe:/a:amazon:linux:pcp-pmda-elasticsearch, p-cpe:/a:amazon:linux:pcp-pmda-gfs2, p-cpe:/a:amazon:linux:pcp-pmda-gluster, p-cpe:/a:amazon:linux:pcp-pmda-gpfs, p-cpe:/a:amazon:linux:pcp-pmda-gpsd, p-cpe:/a:amazon:linux:pcp-pmda-haproxy, p-cpe:/a:amazon:linux:pcp-pmda-infiniband, p-cpe:/a:amazon:linux:pcp-pmda-json, p-cpe:/a:amazon:linux:pcp-pmda-libvirt, p-cpe:/a:amazon:linux:pcp-pmda-lio, p-cpe:/a:amazon:linux:pcp-pmda-lmsensors, p-cpe:/a:amazon:linux:pcp-pmda-logger, p-cpe:/a:amazon:linux:pcp-pmda-lustre, p-cpe:/a:amazon:linux:pcp-pmda-lustrecomm, p-cpe:/a:amazon:linux:pcp-pmda-mailq, p-cpe:/a:amazon:linux:pcp-pmda-memcache, p-cpe:/a:amazon:linux:pcp-pmda-mic, p-cpe:/a:amazon:linux:pcp-pmda-mounts, p-cpe:/a:amazon:linux:pcp-pmda-mysql, p-cpe:/a:amazon:linux:pcp-pmda-named, p-cpe:/a:amazon:linux:pcp-pmda-netfilter, p-cpe:/a:amazon:linux:pcp-pmda-news, p-cpe:/a:amazon:linux:pcp-pmda-nfsclient, p-cpe:/a:amazon:linux:pcp-pmda-nginx, p-cpe:/a:amazon:linux:pcp-pmda-nvidia-gpu, p-cpe:/a:amazon:linux:pcp-pmda-oracle, p-cpe:/a:amazon:linux:pcp-pmda-pdns, p-cpe:/a:amazon:linux:pcp-pmda-perfevent, p-cpe:/a:amazon:linux:pcp-pmda-postfix, p-cpe:/a:amazon:linux:pcp-pmda-postgresql, p-cpe:/a:amazon:linux:pcp-pmda-prometheus, p-cpe:/a:amazon:linux:pcp-pmda-redis, p-cpe:/a:amazon:linux:pcp-pmda-roomtemp, p-cpe:/a:amazon:linux:pcp-pmda-rpm, p-cpe:/a:amazon:linux:pcp-pmda-rsyslog, p-cpe:/a:amazon:linux:pcp-pmda-samba, p-cpe:/a:amazon:linux:pcp-pmda-sendmail, p-cpe:/a:amazon:linux:pcp-pmda-shping, p-cpe:/a:amazon:linux:pcp-pmda-slurm, p-cpe:/a:amazon:linux:pcp-pmda-smart, p-cpe:/a:amazon:linux:pcp-pmda-snmp, p-cpe:/a:amazon:linux:pcp-pmda-summary, p-cpe:/a:amazon:linux:pcp-pmda-systemd, p-cpe:/a:amazon:linux:pcp-pmda-trace, p-cpe:/a:amazon:linux:pcp-pmda-unbound, p-cpe:/a:amazon:linux:pcp-pmda-vmware, p-cpe:/a:amazon:linux:pcp-pmda-weblog, p-cpe:/a:amazon:linux:pcp-pmda-zimbra, p-cpe:/a:amazon:linux:pcp-pmda-zswap, p-cpe:/a:amazon:linux:pcp-selinux, p-cpe:/a:amazon:linux:pcp-system-tools, p-cpe:/a:amazon:linux:pcp-testsuite, p-cpe:/a:amazon:linux:pcp-webapi, p-cpe:/a:amazon:linux:pcp-webapp-blinkenlights, p-cpe:/a:amazon:linux:pcp-webapp-grafana, p-cpe:/a:amazon:linux:pcp-webapp-graphite, p-cpe:/a:amazon:linux:pcp-webapp-vector, p-cpe:/a:amazon:linux:pcp-webjs, p-cpe:/a:amazon:linux:pcp-zeroconf, p-cpe:/a:amazon:linux:pcp, p-cpe:/a:amazon:linux:perl-pcp-logimport, p-cpe:/a:amazon:linux:perl-pcp-logsummary, p-cpe:/a:amazon:linux:perl-pcp-mmv, p-cpe:/a:amazon:linux:perl-pcp-pmda, p-cpe:/a:amazon:linux:python-pcp

Required KB Items: Host/local_checks_enabled, Host/AmazonLinux/release, Host/AmazonLinux/rpm-list

Exploit Ease: No known exploits are available

Patch Publication Date: 8/17/2026

Vulnerability Publication Date: 7/30/2026

Reference Information

CVE: CVE-2026-16526, CVE-2026-16529