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Advisory severityHigh7.5Red Hat Linux

High [CVE-2026-16529] Denial of Service due to signed integer overflow

This high-severity Red Hat Linux advisory covers CVE-2026-16529 affecting Red Hat Enterprise Linux 10.0 Extended Update Support, Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support, Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-16529 Source published Source updated

VulniPulse record published Record updated

CVE-2026-16529
Affected products & platforms
Red Hat LinuxRed Hat Enterprise Linux
Open source advisory

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Summary

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.

This is an Important denial of service vulnerability in PCP due to a signed integer overflow. An unauthenticated remote attacker could exhaust resources by sending a specially crafted request to the pmlogger or pmcd services, leading to a permanent denial of service for the affected daemon.

While both services are typically bound to the loopback interface by default, remote exploitation is possible if the default binding configuration is altered or if PMLOGGER_LOCAL is unset for pmlogger. Red Hat severity: Important — CVSS 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

Weakness: CWE-190.

Affected products named by the advisory: Red Hat Enterprise Linux 10.0 Extended Update Support; Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support; Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On; Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support; and 9 more.

Affected versions

No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.

Official advisory · high-confidence parse· fetched 1 month ago·verify at source

Fixed versions
  • pcp-0:7.0.3-5.el10_2
  • pcp-0:6.3.7-1.el10_0.1
  • pcp-0:5.3.7-22.el8_10.5
  • pcp-0:5.2.5-8.el8_4.1
  • pcp-0:5.3.5-10.el8_6.1
  • pcp-0:5.3.7-19.el8_8.1
  • pcp-0:6.3.7-8.el9_8.4
  • pcp-0:6.0.1-8.el9_2.2
  • pcp-0:6.2.0-5.el9_4.2
  • pcp-0:6.3.7-1.el9_6.1
  • RHSA-2026:55617
  • RHSA-2026:72273
  • RHSA-2026:55560
  • RHSA-2026:74613
  • RHSA-2026:74612
  • RHSA-2026:73767
  • RHSA-2026:55740
  • RHSA-2026:72594
  • RHSA-2026:72593
  • RHSA-2026:72272

Official advisory · high-confidence parse· fetched 1 month ago·verify at source

Mitigation checklist

Recommended fix / mitigation
  • To mitigate this issue, ensure that Performance Co-Pilot (PCP) services, specifically `pmlogger` and `pmcd`, are not exposed to untrusted networks. By default, these services are configured to listen only on the loopback interface, which prevents remote exploitation. If these default network bindings have been altered, revert them to restrict access to localhost. For `pmlogger`, ensure the `PMLOGGER_LOCAL` environment variable is set. If remote access to PCP services is not required, consider implementing firewall rules to block external connections to TCP ports 4330 (pmlogger) and 44321 (pmcd). Changes to network configurations or environment variables may require restarting the affected PCP services for the mitigation to take effect.

Official advisory · high-confidence parse· fetched 1 month ago·verify at source

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