CVE-2026-16524 Red Hat CVE debrief

Who should care

Organizations using PCP's linux_sockets PMDA, particularly those with exposure to the network.persocket.filter metric, should be aware of this vulnerability and take steps to mitigate it. This includes reviewing system configurations, assessing potential impact, and applying patches or updates provided by the vendor. Additionally, security teams and vulnerability management teams should prioritize patching and monitor systems for suspicious activity related to the network.persocket.filter metric. Operators and administrators responsible for maintaining systems with PCP's linux_sockets PMDA should also be aware of this vulnerability and take necessary precautions to prevent exploitation. Vulnerability management teams should ensure that affected systems are identified and prioritized for patching. Security teams should review compensating controls and monitor for potential attacks. Asset inventory management teams should verify that affected assets are properly tracked and prioritized for remediation. IT operations teams should plan for and apply patches through normal change control processes. Incident response teams should be prepared to respond to potential exploitation attempts. Communications teams should be aware of the potential impact on business operations and facilitate prompt remediation efforts. Compliance and risk management teams should assess the potential impact on regulatory requirements and organizational risk posture. Business stakeholders should be informed of the potential risks and mitigation strategies. System administrators and IT managers should ensure that necessary patches are applied and verify the effectiveness of compensating controls. Network administrators should review network configurations to prevent exploitation. Cybersecurity teams should prioritize monitoring and detection of potential attacks. Auditors and compliance officers should verify that remediation efforts meet organizational standards and regulatory requirements. Business continuity planners should assess the potential impact on business operations and develop strategies to minimize disruption. Public sector organizations and critical infrastructure providers should

Technical summary

The CVE-2026-16524 vulnerability is a command injection flaw in PCP's linux_sockets PMDA. The flaw allows malicious shell metacharacters via the network.persocket.filter metric, enabling attackers to execute arbitrary commands as the PMDA user when metrics refresh. This vulnerability affects systems using PCP's linux_sockets PMDA and requires patching to prevent potential command injection attacks.

Defensive priority

Organizations using PCP's linux_sockets PMDA should prioritize patching to prevent potential command injection attacks.

Recommended defensive actions

• Apply patches or updates provided by the vendor to address the command injection vulnerability
• Restrict access to the PMDA user to minimize potential impact
• Monitor systems for suspicious activity related to the network.persocket.filter metric
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record indicates a command injection flaw in PCP's linux_sockets PMDA, allowing malicious shell metacharacters via the network.persocket.filter metric. This flaw lets attackers execute arbitrary commands as the PMDA user when metrics refresh. The NVD entry is currently Awaiting Analysis. To verify and mitigate this vulnerability, defenders should review the official advisory, assess their exposure, and apply patches or updates provided by the vendor.

Official resources