Bug 2506026 (CVE-2026-16526) - CVE-2026-16526 PCP: PCP: Privilege escalation to root via linux_sockets PMDA vulnerability
Summary: CVE-2026-16526 PCP: PCP: Privilege escalation to root via linux_sockets PMDA ...
Keywords:
Status: NEW
Alias: CVE-2026-16526
Deadline: 2026-07-30
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2511464
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-07-22 07:26 UTC by OSIDB Bzimport
Modified: 2026-10-29 20:26 UTC (History)
4 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2026:55560 0 None None None 2026-08-17 10:32:47 UTC
Red Hat Product Errata RHSA-2026:55617 0 None None None 2026-08-17 19:46:30 UTC
Red Hat Product Errata RHSA-2026:55740 0 None None None 2026-08-17 19:41:04 UTC
Red Hat Product Errata RHSA-2026:72272 0 None None None 2026-09-28 04:58:14 UTC
Red Hat Product Errata RHSA-2026:72273 0 None None None 2026-09-28 04:02:31 UTC
Red Hat Product Errata RHSA-2026:72593 0 None None None 2026-09-28 15:14:40 UTC
Red Hat Product Errata RHSA-2026:72594 0 None None None 2026-09-28 15:13:21 UTC
Red Hat Product Errata RHSA-2026:73767 0 None None None 2026-09-30 07:56:27 UTC
Red Hat Product Errata RHSA-2026:74612 0 None None None 2026-10-01 22:52:31 UTC
Red Hat Product Errata RHSA-2026:74613 0 None None None 2026-10-01 22:45:50 UTC

Description OSIDB Bzimport 2026-07-22 07:26:46 UTC 
Summary: When the linux_sockets PMDA is loaded as a DSO inside PMCD, code execution
achieved via Vulnerability 3 (network.persocket.filter injection) can be escalated from user
pcp to root. The pmdarootfd Unix socket connection to pmdaroot is created without
O_CLOEXEC, causing all child processes spawned by popen() to inherit it. pmdaroot runs as
root and processes PDUROOT_STARTPMDA_REQ without per-request authentication,
executing attacker-controlled arguments via execvp() as root.
Prerequisites:
• Vulnerability 3 (linux_sockets command injection) required for initial code execution
- exploitable either locally via pmcd (TCP 44321, localhost only by default) or
remotely via the pmproxy REST API (TCP 44322, all interfaces by default, no
authentication required). linux_sockets
• PMDA loaded as DSO in PMCD (requires explicit configuration in pmcd.conf; default
is daemon mode).
Comment 1 errata-xmlrpc 2026-08-17 10:32:46 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:55560 https://access.redhat.com/errata/RHSA-2026:55560
Comment 2 errata-xmlrpc 2026-08-17 19:41:03 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:55740 https://access.redhat.com/errata/RHSA-2026:55740
Comment 3 errata-xmlrpc 2026-08-17 19:46:29 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:55617 https://access.redhat.com/errata/RHSA-2026:55617
Comment 4 Jon Orris 2026-09-28 04:02:30 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:72273 https://access.redhat.com/errata/RHSA-2026:72273
Comment 5 Jon Orris 2026-09-28 04:58:13 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:72272 https://access.redhat.com/errata/RHSA-2026:72272
Comment 6 Jon Orris 2026-09-28 15:13:21 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:72594 https://access.redhat.com/errata/RHSA-2026:72594
Comment 7 Jon Orris 2026-09-28 15:14:39 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions

Via RHSA-2026:72593 https://access.redhat.com/errata/RHSA-2026:72593
Comment 8 Jon Orris 2026-09-30 07:56:26 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
  Red Hat Enterprise Linux 8.8 Telecommunications Update Service

Via RHSA-2026:73767 https://access.redhat.com/errata/RHSA-2026:73767
Comment 10 Jon Orris 2026-10-01 22:45:49 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On

Via RHSA-2026:74613 https://access.redhat.com/errata/RHSA-2026:74613
Comment 11 Jon Orris 2026-10-01 22:52:30 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On

Via RHSA-2026:74612 https://access.redhat.com/errata/RHSA-2026:74612
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