CVE-2026-104032 Red Hat CVE debrief

Who should care

System administrators and security teams responsible for systems using SSSD, especially those with autofs configurations, should assess exposure and implement mitigations. This includes reviewing system configurations, monitoring resource consumption, and planning for potential updates or patches. The vulnerability's medium severity emphasizes the need for prompt attention to prevent potential Denial of Service and resource exhaustion.

Why it matters

CVE-2026-104032 is a medium-severity vulnerability in SSSD that can lead to Denial of Service (DoS) and elevated resource consumption. System administrators and security teams should assess exposure and implement mitigations, especially for systems with autofs configurations.

• Potential for Denial of Service (DoS) due to degraded automount availability.
• Elevated resource consumption due to repeated lookups to backend directory providers.
• Need for monitoring system resource consumption and automount availability.
• Potential for abuse by unprivileged users.

Technical summary

The flaw in SSSD allows an unprivileged local user to repeatedly request master automount map updates, triggering global cache invalidation and forcing repeated lookups to backend directory providers, leading to a Denial of Service (DoS). This issue arises from missing authorization checks in the autofs responder, allowing unprivileged users to impact system resource consumption and automount availability. Affected systems require prompt review and potential updates to SSSD configurations to mitigate the vulnerability.

Defensive priority

Medium priority for systems using SSSD, especially those with autofs configurations.

Recommended defensive actions

• Review and update SSSD configurations to limit autofs cache invalidation requests from unprivileged users.
• Monitor system resource consumption and automount availability.
• Consider implementing additional logging and monitoring to detect potential abuse.
• Perform vulnerability assessment to identify potentially affected systems.
• Develop and implement compensating controls for exposed systems.
• Inventory and track systems using SSSD with autofs configurations.
• Plan and execute vendor-supported updates or mitigations through normal change control.

Evidence notes

The CVE record and source item provide details on the flaw, its impact, and affected systems. However, specific version information and remediation steps are not provided. Defenders should verify system configurations, review autofs cache invalidation processes, and monitor system resource consumption and automount availability for potential anomalies. Additional review of system logs and security monitoring tools may be necessary to detect potential abuse by unprivileged users.

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.