CVE-2026-16529
Received Received - Intake

Integer Overflow in PCP __pmGetPDU() Leading to DoS

Publication date: 2026-07-30

Last updated on: 2026-07-30

Assigner: Red Hat, Inc.

Description
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.

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Meta Information

Published
2026-07-30
Last Modified
2026-07-30
Generated
2026-07-30
AI Q&A
2026-07-30
EPSS Evaluated
N/A
NVD
CVE-2026-16529
EUVD
EUVD-2026-50977

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
performance_co_pilot pcp *

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-190 The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.

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Executive Summary

This is a signed integer overflow vulnerability in the PCP __pmGetPDU() function that can be triggered by specially crafted network packets during PDU processing or SASL negotiation. It corrupts a process-wide variable, causing the affected daemon to permanently lose the ability to read any further packets, resulting in a total denial of service.

Detection Guidance

To detect this vulnerability, monitor for unexpected crashes or unresponsiveness in PCP services (pmlogger on port 4330 or pmcd on port 44321). Check logs for connection failures or NULL PDU buffer errors. Use network scanners to verify if these ports are unexpectedly exposed to external access.

Impact Analysis

The vulnerability can cause a complete denial of service for the PCP daemon, preventing it from processing any subsequent network packets. This disrupts monitoring and logging services that rely on PCP, potentially affecting system operations and data collection.

Mitigation Strategies

Immediately update PCP to the latest patched version. If immediate patching is not possible, restrict network access to ports 4330 and 44321 using firewalls. Disable remote access to pmlogger by setting PMLOGGER_LOCAL. Review and revert any non-default binding configurations for pmcd.

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