CVE-2026-88252 Red Hat CVE debrief

Who should care

System administrators and security teams responsible for managing sssd installations should assess exposure and implement mitigations to prevent potential impact on identity and authentication requests. This includes reviewing and applying vendor advisories, monitoring system handles, and implementing compensating controls to mitigate the vulnerability.

Why it matters

A local user can cause a Denial of Service (DoS) in sssd by exhausting the responder service's available file descriptors, leading to high CPU utilization and stalling the service. System administrators and security teams responsible for managing sssd installations should assess exposure and implement mitigations.

• Denial of Service (DoS) leading to high CPU utilization and stalling of the service
• Potential impact on identity and authentication requests

Technical summary

A flaw was found in sssd. A local user can cause a Denial of Service (DoS) by exhausting the responder service's available file descriptors, which can lead to high CPU utilization and stall the service. This vulnerability can be exploited by opening and maintaining many concurrent connections to a responder socket while continuing to queue new connection attempts, triggering an unthrottled retry loop. The vulnerability affects sssd installations and requires review of vendor advisories for mitigation guidance. System administrators should assess exposure and implement necessary controls.

Defensive priority

Medium-priority defensive actions are recommended to address the Denial of Service (DoS) vulnerability in sssd.

Recommended defensive actions

• Review and apply vendor advisory for CVE-2026-88252
• Monitor system handles used for open connections to prevent Denial of Service (DoS)
• Implement compensating controls to mitigate the vulnerability
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed
• Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE record and NVD vulnerability detail page provide information on the Denial of Service (DoS) vulnerability in sssd. Evidence is limited to public sources and may not reflect the full scope or current accuracy of the vulnerability. Defenders should verify affected systems, review vendor advisories, and monitor for potential exploitation attempts.

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.