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Performance Co-Pilot CVE-2026-16529

| EUVDEUVD-2026-50977 HIGH
Integer Overflow or Wraparound (CWE-190)
2026-07-30 redhat GHSA-hm96-wjh8-qqgm
Denial Of Service Integer Overflow Red Hat Enterprise Linux 10 Red Hat Enterprise Linux 6 Red Hat Enterprise Linux 7 Red Hat Enterprise Linux 8 Red Hat Enterprise Linux 9 Red Hat Openshift Container Platform 4 Red Hat
7.5
CVSS 3.1 · Vendor: redhat
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Severity by source

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

Single crafted packet reaches the flaw pre-authentication during SASL negotiation (AV:N/AC:L/PR:N/UI:N); impact is a persistent daemon outage only, so C:N/I:N/A:H.

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

Primary rating from Vendor (redhat).

CVSS VectorVendor: redhat

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

Lifecycle Timeline

2
Analysis Generated
Jul 30, 2026 - 08:31 vuln.today
CVE Published
Jul 30, 2026 - 05:30 nvd
HIGH 7.5

DescriptionCVE.org

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.

AnalysisAI

Remote unauthenticated denial of service in Performance Co-Pilot (PCP), the system performance monitoring toolkit shipped with Red Hat Enterprise Linux 6 through 10 and OpenShift Container Platform 4, allows an attacker to permanently disable a PCP daemon by triggering a signed integer overflow (CWE-190) in the __pmGetPDU() PDU-length handling routine. A crafted network packet sent during normal PDU processing or SASL authentication negotiation corrupts the read logic so that the daemon can no longer read any subsequent packets, requiring a manual restart. There is no public exploit identified at time of analysis and the flaw yields no code execution or data exposure - impact is availability-only (CVSS 7.5, A:H).

Technical ContextAI

Performance Co-Pilot is an open-source distributed monitoring framework whose collector daemon (pmcd) and agents exchange fixed-format Protocol Data Units (PDUs) over the network, typically on TCP port 44321. The __pmGetPDU() function is the core routine that reads the PDU header, extracts the declared length field, and validates/allocates the buffer for the remaining payload. CWE-190 (Integer Overflow or Wraparound) applies here because the length arithmetic is performed on a signed integer: a crafted value causes the computed size or offset to wrap around a signed boundary, leaving the daemon's read state machine in a corrupted condition. Because the same PDU-reading path is reached both during ordinary metric requests and during the initial SASL authentication handshake, the overflow can be triggered before any authentication completes, and the corruption is persistent rather than a one-time crash - the daemon is left permanently unable to read further packets.

RemediationAI

Apply the updated Performance Co-Pilot (pcp) packages for your RHEL major version once Red Hat publishes them; a released patched version is not independently confirmed from the provided data, so track the vendor advisory at https://access.redhat.com/security/cve/CVE-2026-16529 and Bugzilla 2506032 for the exact fixed package NVR for your stream. Until patched packages are installed, reduce exposure by restricting network reachability of the pmcd daemon: firewall or bind PCP listener ports (default TCP 44321, plus pmproxy 44322 and pmwebd) so only trusted management hosts can connect, which prevents untrusted senders from delivering the crafted PDU at the cost of losing remote metric collection from those blocked hosts. Where remote PCP collection is not required, disable and stop the pmcd/pmproxy services entirely to remove the attack surface, accepting the loss of that host's performance telemetry. Monitor for unexpected pmcd unresponsiveness and configure service auto-restart (e.g., systemd Restart=on-failure) as a stopgap to recover availability after a triggered outage.

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Same weakness CWE-190 – Integer Overflow or Wraparound

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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-2026-16529 vulnerability details – vuln.today
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