RHEL 7 SELinux Policy Module Outdated After Security Update

📖 ~1 min read

Table of contents

1. Symptom & Impact
2. Environment & Reproduction
3. Root Cause Analysis
4. Quick Triage
5. Step-by-Step Diagnosis
6. Solution – Primary Fix
7. Solution – Alternative Approaches
8. Verification & Acceptance Criteria
9. Rollback Plan
10. Prevention & Hardening
11. Related Errors & Cross-Refs
12. References & Further Reading

Symptom & Impact

After patching, previously working services begin failing with new AVC denials. systemctl status may show active then failed transitions under load.

Environment & Reproduction

Seen on RHEL 7 when selinux-policy packages update but custom modules are stale. yum maintenance windows and service restarts expose incompatibilities.

Root Cause Analysis

Custom policy assumptions no longer align with updated base policy interfaces. firewalld rules may still be correct, but SELinux blocks execution paths.

Quick Triage

Check yum history for policy package updates, inspect AVC logs, and review journalctl around restart times. Validate service and firewall status concurrently.

Step-by-Step Diagnosis

Compare loaded policy versions, rebuild or recompile custom modules, and test in permissive mode only for diagnosis. Correlate denied classes and types.

Solution – Primary Fix

Update or rebuild affected SELinux modules, relabel if required, and restart services with systemctl. Confirm clean journalctl output and stable runtime behavior.

Solution – Alternative Approaches

Temporarily disable custom modules, use vendor-supported defaults, or redesign service behavior to reduce policy exceptions.

Verification & Acceptance Criteria

No recurring AVC denials for target service, all health checks pass, and package state is consistent after yum update.

Rollback Plan

Revert to previous selinux-policy package set and module versions if breakage persists. Restore prior service and firewall configuration snapshots.

Prevention & Hardening

Version-control custom modules, test policy updates in staging, and include AVC regression checks in release gates.

Related Errors & Cross-Refs

Related issues include unlabeled file access and boolean expectation mismatch. See linked tutorial 9071 for policy lifecycle management.

Related tutorial: View the step-by-step tutorial for rhel-7.

View all rhel-7 tutorials on the Tutorials Hub →

Browse all common problems & solutions on the Tutorials Hub.

References & Further Reading

Refer to man selinux, man semodule, man systemctl, man service, man yum, man firewall-cmd, and man journalctl.