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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
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

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Reach exposed PCP daemon port
Delivery
Send crafted PDU during read/SASL negotiation
Exploit
Trigger signed integer overflow in __pmGetPDU()
Execution
Corrupt packet-read state permanently
Impact
Monitoring daemon blinded, total DoS

Vulnerability AssessmentAI

Exploitation Exploitation requires network reachability to a listening PCP daemon (e.g., pmcd on TCP 44321) that processes the crafted PDU through __pmGetPDU(); the CVSS vector's PR:N is corroborated by the description stating the overflow can be reached during SASL negotiation, meaning the malicious packet is parsed before authentication completes, so no valid credentials are needed. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) is internally consistent with the description: the SASL-negotiation trigger confirms exploitation is possible before authentication (PR:N), the flaw is reached by a single crafted packet with no user interaction (AC:L/UI:N), and impact is confined to availability with no confidentiality or integrity loss, capping the base score at 7.5 (High). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker with network reach to a PCP collector sends a single crafted PDU - either as a normal metric-fetch packet or during the initial SASL authentication exchange - whose length field triggers the signed integer overflow in __pmGetPDU(). The daemon's packet-read logic is permanently corrupted and stops processing all subsequent packets, taking monitoring offline until an administrator manually restarts the service; no authentication is needed and no public exploit code is currently known.
Remediation 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. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours, inventory all systems running RHEL 6-10 and OpenShift Container Platform 4 to identify PCP deployments, and enable network monitoring to detect suspicious PDU traffic targeting PCP daemons (pmcd service, typically port 44321). …

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Threat intelligence, references, and detailed analysis are available after sign-in.

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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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