Alibaba Cloud Linux 3 : 0266: pcp (ALINUX3-SA-2026:0266)

high Nessus Plugin ID 342079

Synopsis

The remote Alibaba Cloud Linux host is missing one or more security updates.

Description

The remote Alibaba Cloud Linux 3 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALINUX3-SA-2026:0266 advisory.

Package updates are available for Alibaba Cloud Linux 3 that fix the following vulnerabilities:

CVE-2026-16524:
A command injection flaw in PCP's linux_sockets PMDA allows malicious shell metacharacters via the network.persocket.filter metric.
This failed validation lets attackers execute arbitrary commands as the PMDA user when metrics refresh.

CVE-2026-16526:
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-2026-16527:
An unauthenticated remote attacker can bypass access controls by sending crafted requests to the PCP pmproxy /store endpoint. This allows the attacker to overwrite any PMDA metric, leading to arbitrary code execution and system takeover.

CVE-2026-16529:
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.

Tenable has extracted the preceding description block directly from the Alibaba Cloud Linux 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

Update the affected packages.

Plugin Details

Severity: High

ID: 342079

File Name: alinux3_sa_2026-0266.nasl

Version: 1.1

Type: Local

Family: Alibaba Cloud Linux Local Security Checks

Published: 9/1/2026

Updated: 9/1/2026

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.15

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.4

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

CVSS Score Source: CVE-2026-16524

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

CVSS Score Source: CVE-2026-16526

Vulnerability Information

CPE: cpe:/o:alibabacloud:alibaba_cloud_linux_3, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-conf, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-devel, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-doc, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-export-pcp2elasticsearch, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-export-pcp2graphite, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-export-pcp2influxdb, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-export-pcp2json, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-export-pcp2spark, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-export-pcp2xml, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-export-pcp2zabbix, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-export-zabbix-agent, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-gui, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-import-collectl2pcp, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-import-ganglia2pcp, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-import-iostat2pcp, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-import-mrtg2pcp, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-import-sar2pcp, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-libs-devel, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-libs, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-pmda-activemq, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-pmda-apache, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-pmda-bash, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-pmda-bcc, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-pmda-bind2, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-pmda-bonding, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-pmda-bpftrace, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-pmda-cifs, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-pmda-cisco, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-pmda-dbping, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-pmda-denki, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-pmda-dm, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-pmda-docker, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-pmda-ds389, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-pmda-ds389log, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-pmda-elasticsearch, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-pmda-gfs2, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-pmda-gluster, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-pmda-gpfs, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-pmda-gpsd, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-pmda-hacluster, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-pmda-haproxy, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-pmda-infiniband, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-pmda-json, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-pmda-libvirt, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-pmda-lio, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-pmda-lmsensors, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-pmda-logger, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-pmda-lustre, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-pmda-lustrecomm, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-pmda-mailq, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-pmda-memcache, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-pmda-mic, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-pmda-mongodb, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-pmda-mounts, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-pmda-mssql, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-pmda-mysql, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-pmda-named, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-pmda-netcheck, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-pmda-netfilter, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-pmda-news, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-pmda-nfsclient, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-pmda-nginx, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-pmda-nvidia-gpu, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-pmda-openmetrics, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-pmda-openvswitch, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-pmda-oracle, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-pmda-pdns, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-pmda-perfevent, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-pmda-podman, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-pmda-postfix, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-pmda-postgresql, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-pmda-rabbitmq, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-pmda-redis, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-pmda-roomtemp, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-pmda-rsyslog, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-pmda-samba, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-pmda-sendmail, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-pmda-shping, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-pmda-slurm, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-pmda-smart, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-pmda-snmp, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-pmda-sockets, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-pmda-statsd, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-pmda-summary, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-pmda-systemd, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-pmda-trace, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-pmda-unbound, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-pmda-weblog, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-pmda-zimbra, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-pmda-zswap, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-selinux, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-system-tools, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-testsuite, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp-zeroconf, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:pcp, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:perl-pcp-logimport, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:perl-pcp-logsummary, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:perl-pcp-mmv, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:perl-pcp-pmda, p-cpe:/a:alibabacloud:alibaba_cloud_linux_3:python3-pcp

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

Exploit Ease: No known exploits are available

Patch Publication Date: 8/28/2026

Vulnerability Publication Date: 7/30/2026

Reference Information

CVE: CVE-2026-16524, CVE-2026-16526, CVE-2026-16527, CVE-2026-16529

Detections

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