CVE-2026-94640
Received Received - Intake

rpcbind Remote DoS via Unbounded RPC Statistics

Publication date: 2026-09-22

Last updated on: 2026-09-22

Assigner: redhat-SADP

Description
A flaw was found in rpcbind. This vulnerability allows a remote, unauthenticated attacker to cause a Denial of Service (DoS) by sending a large number of unique requests. The rpcbind service records previously unseen RPC (Remote Procedure Call) statistics in unbounded in-memory lists, leading to persistent memory growth and increased CPU usage. This can degrade or exhaust service availability.

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Meta Information

Published
2026-09-22
Last Modified
2026-09-22
Generated
2026-09-22
AI Q&A
2026-09-22
EPSS Evaluated
N/A
NVD
CVE-2026-94640
EUVD
EUVD-2026-84534

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
red_hat rpcbind 1.2.7-3.el10

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-400 The product does not properly control the allocation and maintenance of a limited resource.

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Executive Summary

This vulnerability is a Denial of Service (DoS) flaw in the rpcbind service. A remote attacker can send many unique RPC requests, causing rpcbind to store each request's statistics in unbounded in-memory lists. This leads to persistent memory growth and high CPU usage, degrading or exhausting service availability.

Detection Guidance

Monitor rpcbind service for high memory or CPU usage. Check for unusual network traffic on port 111. Use commands like 'ss -tulnp | grep 111' to verify rpcbind listening ports, 'top' or 'htop' to observe resource consumption, and 'journalctl -u rpcbind' to review service logs for errors or anomalies.

Impact Analysis

If exploited, this vulnerability can cause your rpcbind service to become slow or completely unavailable. This may disrupt services relying on RPC, such as NFS or other network services using port 111. Systems exposed to untrusted networks are at higher risk.

Mitigation Strategies

Restrict network access to rpcbind on port 111 using firewall rules (e.g., firewalld). If rpcbind is only needed locally, configure it to listen only on the loopback interface. Disable or stop the service if not required. Monitor for unusual activity and apply patches once available.

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