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Performance Co-Pilot CVE-2026-16526

| EUVDEUVD-2026-50971 HIGH
Exposure of File Descriptor to Unintended Control Sphere ('File Descriptor Leak') (CWE-403)
2026-07-30 redhat GHSA-534w-2xfq-h655
8.8
CVSS 3.1 · Vendor: redhat
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Severity by source

Vendor (redhat) PRIMARY
8.8 HIGH
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
vuln.today AI
7.8 HIGH

Description requires an existing on-host foothold, so AV:L and PR:L; escalation yields full root, giving C:H/I:H/A:H with unchanged scope.

3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
4.0 AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
SUSE
7.8 CRITICAL
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Red Hat
8.8 HIGH
qualitative

Primary rating from Vendor (redhat).

CVSS VectorVendor: redhat

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

2
Analysis Generated
Jul 30, 2026 - 05:50 vuln.today
CVE Published
Jul 30, 2026 - 05:20 cve.org
HIGH 8.8

DescriptionCVE.org

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.

AnalysisAI

Local privilege escalation in Performance Co-Pilot (PCP) on Red Hat Enterprise Linux 6 through 10 and OpenShift Container Platform 4 arises from the linux_sockets module exposing an unsecured internal connection. An attacker who already holds low-level code execution on the host can leverage this leaked/unprotected socket to run arbitrary commands as root. No public exploit has been identified at time of analysis and the flaw is not in CISA KEV, so exploitation would require an existing foothold rather than remote unauthenticated access.

Technical ContextAI

Performance Co-Pilot is Red Hat's system performance monitoring and metrics collection framework (pmcd and related agents/PMDAs) shipped across RHEL and OpenShift. The vulnerable component is the linux_sockets module, which enumerates and reports socket state; per the description it exposes an internal connection that is left unsecured. This maps to CWE-403 (Exposure of File Descriptor to Unintended Control Sphere / 'File Descriptor Leak'), where a privileged process passes or leaves accessible a file descriptor or socket endpoint that a lower-privileged control sphere can reach and abuse. Because PCP daemons typically run with elevated privileges to gather kernel and system metrics, an exposed control channel becomes a bridge from a constrained context to root-level command execution.

RemediationAI

No vendor-released patch version is identified in the provided data; monitor and apply the Red Hat erratum referenced at https://access.redhat.com/security/cve/CVE-2026-16526 (tracking bug https://bugzilla.redhat.com/show_bug.cgi?id=2506026) as soon as fixed PCP packages are published for your RHEL 6-10 or OpenShift 4 release, then update via dnf/yum. As a compensating control until patched, stop or disable the PCP collector on hosts that do not require metrics collection (systemctl disable --now pmcd pmlogger), which trades away performance monitoring on those systems; where PCP is needed, restrict who can obtain initial code execution by tightening local access, container/tenant isolation, and SELinux enforcement so an attacker cannot reach the exposed internal socket. Because the escalation depends on an existing foothold, hardening the surrounding privilege boundaries meaningfully reduces exposure even without the fix.

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Vendor StatusVendor

SUSE

Severity: Critical
Product Status
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS Affected
SUSE Linux Enterprise Module for Development Tools 15 SP7 Affected

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CVE-2026-16526 vulnerability details – vuln.today

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