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Fencer Vulns
high 8.8

CVE-2026-16526 json

Pcp: pcp: privilege escalation to root via linux_sockets pmda vulnerability

published 2026-07-30 3 mo ago modified 2026-11-04 4 d ago also EUVD-2026-50971

cvss
8.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 47%
public exploits
0
none known

Summary

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.

Patch / fix

  • Red Hat Red Hat Enterprise Linux 10 0:7.0.3-5.el10_2
  • Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support 0:6.3.7-1.el10_0.1
  • Red Hat Red Hat Enterprise Linux 8 0:5.3.7-22.el8_10.5
  • Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support 0:5.2.5-8.el8_4.1
  • Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On 0:5.2.5-8.el8_4.1
  • Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support 0:5.3.5-10.el8_6.1
  • Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On 0:5.3.5-10.el8_6.1
  • Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service 0:5.3.7-19.el8_8.1
  • Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions 0:5.3.7-19.el8_8.1
  • Red Hat Red Hat Enterprise Linux 9 0:6.3.7-8.el9_8.4
  • Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions 0:6.0.1-8.el9_2.2
  • Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions 0:6.2.0-5.el9_4.2
  • Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support 0:6.3.7-1.el9_6.1
  • pcp Debian 14 7.2.0-1

debian advisories DEBIAN-CVE-2026-16526

  • pcp RHEL 9 6.3.7-8.el9_8.4
  • pcp-gui RHEL 9 6.3.7-8.el9_8.4
  • pcp-conf RHEL 9 6.3.7-8.el9_8.4
  • pcp-libs RHEL 9 6.3.7-8.el9_8.4
  • pcp-pmda-dm RHEL 9 6.3.7-8.el9_8.4
  • pcp-selinux RHEL 9 6.3.7-8.el9_8.4
  • python3-pcp RHEL 9 6.3.7-8.el9_8.4
  • pcp-pmda-bcc RHEL 9 6.3.7-8.el9_8.4

red hat advisories RHSA-2026:74613RHSA-2026:74612RHSA-2026:73767RHSA-2026:72594RHSA-2026:72593RHSA-2026:72272

  • pcp SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 6.2.0-160000.4.1
  • pcp Linux Micro 6.1 6.2.0-slfo.1.1_6.1
  • pcp Linux Micro 6.0 6.2.0-2.1
  • pcp SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Development Tools 15 SP7 6.2.0-150600.3.12.1
  • pcp SLES for SAP 15 SP4, SLES 15 SP4-LTSS, SLE High Performance Computing 15 SP4-LTSS +1 more 6.2.0-150400.5.15.1
  • pcp SLES for SAP 15 SP5, SLES 15 SP5-LTSS, SLE High Performance Computing 15 SP5-LTSS +1 more 6.2.0-150500.8.9.1
  • pcp SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 6.2.0-6.32.1

suse advisories SUSE-SU-2026:23277-1SUSE-SU-2026:23316-1SUSE-SU-2026:23174-1SUSE-SU-2026:23064-1SUSE-SU-2026:3508-1SUSE-SU-2026:3507-1

  • pcp openSUSE Leap 16.0 6.2.0-160000.4.1
  • pcp openSUSE Tumbleweed 6.3.8-3.1

opensuse advisories openSUSE-SU-2026:21636-1openSUSE-SU-2026:11490-1

  • pcp-gui AlmaLinux 8 5.3.7-22.el8_10.5
  • pcp-conf AlmaLinux 8 5.3.7-22.el8_10.5
  • pcp-libs AlmaLinux 8 5.3.7-22.el8_10.5
  • pcp-pmda-dm AlmaLinux 8 5.3.7-22.el8_10.5
  • pcp-selinux AlmaLinux 8 5.3.7-22.el8_10.5
  • pcp-pmda-bcc AlmaLinux 8 5.3.7-22.el8_10.5
  • pcp-pmda-lio AlmaLinux 8 5.3.7-22.el8_10.5
  • pcp-pmda-mic AlmaLinux 8 5.3.7-22.el8_10.5

almalinux advisories ALSA-2026:55560ALSA-2026:55617ALSA-2026:55740

  • pcp Rocky Linux 10 7.0.3-5.el10_2
  • pcp Rocky Linux 9 6.3.7-8.el9_8.4
  • pcp Rocky Linux 8 5.3.7-22.el8_10.5

rocky linux advisories RLSA-2026:55617RLSA-2026:55740RLSA-2026:55560

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-16526 updated cvss 8.8

PCP: PCP: Privilege escalation to root via linux_sockets PMDA vulnerability

  • Red Hat Enterprise Linux 6 pcp, pcp-gui, pcp-conf, pcp-libs, pcp-webjs, pcp-webapi, +71 more
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 7 pcp, pcp-gui, pcp-conf, pcp-libs, pcp-webjs, pcp-webapi, +89 more
    affected: workaround, no fix available
  • Red Hat Enterprise Linux AppStream (v. 8) pcp 5.3.7-22.el8_10.5, pcp-gui 5.3.7-22.el8_10.5, pcp-conf 5.3.7-22.el8_10.5, pcp-libs 5.3.7-22.el8_10.5, pcp-pmda-dm 5.3.7-22.el8_10.5, pcp-selinux 5.3.7-22.el8_10.5, +91 more
    fixed: vendor fix RHSA-2026:55560
  • Red Hat Enterprise Linux AppStream (v. 9) pcp 6.3.7-8.el9_8.4, pcp-gui 6.3.7-8.el9_8.4, pcp-conf 6.3.7-8.el9_8.4, pcp-libs 6.3.7-8.el9_8.4, pcp-pmda-dm 6.3.7-8.el9_8.4, pcp-selinux 6.3.7-8.el9_8.4, +98 more
    fixed: vendor fix RHSA-2026:55740
  • Red Hat Enterprise Linux AppStream (v. 10) pcp 7.0.3-5.el10_2, pcp-gui 7.0.3-5.el10_2, pcp-conf 7.0.3-5.el10_2, pcp-libs 7.0.3-5.el10_2, pcp-pmda-dm 7.0.3-5.el10_2, pcp-selinux 7.0.3-5.el10_2, +101 more
    fixed: vendor fix RHSA-2026:55617
  • Red Hat Enterprise Linux AppStream AUS (v.8.4) pcp 5.2.5-8.el8_4.1, pcp-gui 5.2.5-8.el8_4.1, pcp-conf 5.2.5-8.el8_4.1, pcp-libs 5.2.5-8.el8_4.1, pcp-pmda-dm 5.2.5-8.el8_4.1, pcp-selinux 5.2.5-8.el8_4.1, +91 more
    fixed: vendor fix RHSA-2026:74613
  • Red Hat Enterprise Linux AppStream AUS (v.8.6) pcp 5.3.5-10.el8_6.1, pcp-gui 5.3.5-10.el8_6.1, pcp-conf 5.3.5-10.el8_6.1, pcp-libs 5.3.5-10.el8_6.1, pcp-pmda-dm 5.3.5-10.el8_6.1, pcp-selinux 5.3.5-10.el8_6.1, +91 more
    fixed: vendor fix RHSA-2026:74612
  • Red Hat Enterprise Linux AppStream E4S (v.8.8) pcp 5.3.7-19.el8_8.1, pcp-gui 5.3.7-19.el8_8.1, pcp-conf 5.3.7-19.el8_8.1, pcp-libs 5.3.7-19.el8_8.1, pcp-pmda-dm 5.3.7-19.el8_8.1, pcp-selinux 5.3.7-19.el8_8.1, +91 more
    fixed: vendor fix RHSA-2026:73767
show 10 more
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) pcp 6.0.1-8.el9_2.2, pcp-gui 6.0.1-8.el9_2.2, pcp-conf 6.0.1-8.el9_2.2, pcp-libs 6.0.1-8.el9_2.2, pcp-pmda-dm 6.0.1-8.el9_2.2, pcp-selinux 6.0.1-8.el9_2.2, +92 more
    fixed: vendor fix RHSA-2026:72594
  • Red Hat Enterprise Linux AppStream E4S (v.9.4) pcp 6.2.0-5.el9_4.2, pcp-gui 6.2.0-5.el9_4.2, pcp-conf 6.2.0-5.el9_4.2, pcp-libs 6.2.0-5.el9_4.2, pcp-pmda-dm 6.2.0-5.el9_4.2, pcp-selinux 6.2.0-5.el9_4.2, +95 more
    fixed: vendor fix RHSA-2026:72593
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) pcp 6.3.7-1.el10_0.1, pcp-gui 6.3.7-1.el10_0.1, pcp-conf 6.3.7-1.el10_0.1, pcp-libs 6.3.7-1.el10_0.1, pcp-pmda-dm 6.3.7-1.el10_0.1, pcp-selinux 6.3.7-1.el10_0.1, +96 more
    fixed: vendor fix RHSA-2026:72273
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) pcp 6.3.7-1.el9_6.1, pcp-gui 6.3.7-1.el9_6.1, pcp-conf 6.3.7-1.el9_6.1, pcp-libs 6.3.7-1.el9_6.1, pcp-pmda-dm 6.3.7-1.el9_6.1, pcp-selinux 6.3.7-1.el9_6.1, +97 more
    fixed: vendor fix RHSA-2026:72272
  • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) pcp 5.2.5-8.el8_4.1, pcp-gui 5.2.5-8.el8_4.1, pcp-conf 5.2.5-8.el8_4.1, pcp-libs 5.2.5-8.el8_4.1, pcp-pmda-dm 5.2.5-8.el8_4.1, pcp-selinux 5.2.5-8.el8_4.1, +91 more
    fixed: vendor fix RHSA-2026:74613
  • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) pcp 5.3.5-10.el8_6.1, pcp-gui 5.3.5-10.el8_6.1, pcp-conf 5.3.5-10.el8_6.1, pcp-libs 5.3.5-10.el8_6.1, pcp-pmda-dm 5.3.5-10.el8_6.1, pcp-selinux 5.3.5-10.el8_6.1, +91 more
    fixed: vendor fix RHSA-2026:74612
  • Red Hat Enterprise Linux AppStream TUS (v.8.8) pcp 5.3.7-19.el8_8.1, pcp-gui 5.3.7-19.el8_8.1, pcp-conf 5.3.7-19.el8_8.1, pcp-libs 5.3.7-19.el8_8.1, pcp-pmda-dm 5.3.7-19.el8_8.1, pcp-selinux 5.3.7-19.el8_8.1, +91 more
    fixed: vendor fix RHSA-2026:73767
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) pcp-testsuite 7.0.3-5.el10_2
    fixed: vendor fix RHSA-2026:55617
  • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) pcp-pmda-bpf 6.3.7-1.el10_0.1, pcp-testsuite 6.3.7-1.el10_0.1
    fixed: vendor fix RHSA-2026:72273
  • Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-9 Red Hat OpenShift Container Platform 5 openshift/ose-rhel-coreos-9
    not affected: vulnerable code not in execute path

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
3 mo ago

Exploit prediction

0.57% chance of exploitation in the next 30 days, higher than 47% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
  • Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On
  • Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
  • Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On
  • Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service
  • Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat OpenShift Container Platform 4
  • Red Hat Red Hat OpenShift Container Platform 5

Classification

Weakness
  • CWE-403 Exposure of File Descriptor to Unintended Control Sphere

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.