CVE-2026-89329 Red Hat CVE debrief

Who should care

System administrators and security teams responsible for managing multipathd installations should assess their exposure and prioritize patching or verifying their systems. Defenders should care about CVE-2026-89329 because it can lead to a Denial of Service (DoS) in multipathd installations, potentially impacting system availability and requiring verification and patching prioritization.

Why it matters

Defenders should care about CVE-2026-89329 because it can lead to a Denial of Service (DoS) in multipathd installations, potentially impacting system availability and requiring verification and patching prioritization.

• Potential Denial of Service (DoS) impacting legitimate Inter-Process Communication (IPC) operations
• Verification of multipathd installations and patching prioritization required

Technical summary

The multipathd UNIX control socket is vulnerable to a Denial of Service (DoS) attack, where a local attacker can send valid commands and then cease to read replies, causing the multipathd listener thread to block. This vulnerability affects multipathd installations and has a CVSS score of 6.2 with a medium severity level. Defenders should prioritize verifying and patching multipathd installations to prevent potential DoS attacks. The vulnerability does not result in privilege escalation, arbitrary code execution, or impact data confidentiality or integrity.

Defensive priority

Defenders should prioritize verifying and patching multipathd installations to prevent potential DoS attacks.

Recommended defensive actions

• Verify multipathd installations and apply patches or updates as available
• Monitor multipathd logs for unusual activity
• Implement additional security controls to prevent local attackers from accessing the multipathd UNIX control socket
• 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 and NVD entry provide details on the vulnerability, but additional information on affected versions and remediation steps is limited. Defenders should verify multipathd installations and apply patches or updates as available. The vulnerability has a CVSS score of 6.2 and a medium severity level. Additional information can be found in the official CVE Program record and NIST NVD detail page.

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.