CVE-2026-94640 Red Hat CVE debrief

Who should care

Defenders responsible for networked systems, especially those using rpcbind services, should assess exposure and consider implementing rate limiting or access controls to mitigate potential DoS attacks.

Why it matters

CVE-2026-94640 is a high-severity vulnerability in rpcbind that allows remote, unauthenticated attackers to cause Denial of Service (DoS). Defenders should prioritize verifying exposure, especially in networked environments, and consider rate limiting or access controls to mitigate potential attacks. The vulnerability's impact on system performance and stability requires attention from defenders responsible for networked systems.

• Potential degradation or exhaustion of service availability due to memory growth and increased CPU usage
• Need for verification of rpcbind service exposure and potential remediation
• Possible impact on system performance and stability

Technical summary

The rpcbind service records previously unseen RPC statistics in unbounded in-memory lists, leading to persistent memory growth and increased CPU usage when a remote, unauthenticated attacker sends a large number of unique requests. This can cause Denial of Service (DoS) and impact system performance and stability. Defenders should prioritize verifying exposure of rpcbind services, especially in networked environments, and assess the need for rate limiting or access controls to mitigate potential attacks. The vulnerability's technical details require attention from defenders responsible for networked systems.

Defensive priority

Defenders should prioritize verifying exposure of rpcbind services, especially in networked environments, and assess the need for rate limiting or access controls.

Recommended defensive actions

• Verify rpcbind service exposure and assess the need for rate limiting or access controls
• Review network configurations to restrict access to rpcbind services
• Monitor rpcbind service performance and logs for signs of potential abuse
• Implement rate limiting on rpcbind services to prevent excessive requests
• Conduct regular security audits to identify and address potential vulnerabilities
• Review and update incident response plans to include procedures for handling potential DoS attacks
• Track and analyze rpcbind service logs for unusual activity

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, but additional information on affected versions and remediation is limited. Defenders should verify rpcbind service exposure, review network configurations, and monitor service performance and logs for signs of potential abuse. The vulnerability allows remote, unauthenticated attackers to cause Denial of Service (DoS) by sending a large number of unique requests, leading to persistent memory growth and increased CPU usage.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.