🟠 High   ⏱ 5–30 min  Last verified: 19 May 2026
Affected versions: Oracle Linux 10

📖 ~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

Application starts but cannot access files, sockets, or ports due to SELinux denials.

Environment & Reproduction

Common after deploying binaries to non-standard paths or custom service units.

getenforce && sudo ausearch -m avc -ts recent

Root Cause Analysis

File contexts and process domains do not match required policy expectations for the new workload.

Quick Triage

Gather AVC events and confirm whether denials are permissive-testable.

sudo journalctl -t setroubleshoot --since -2h

Step-by-Step Diagnosis

Map denied class/type pairs and identify needed context labels or booleans.

sudo sealert -a /var/log/audit/audit.log
Illustrative mockup for oracle-linux-10 — selinux_avc_audit_log
AVC denials in audit log — Illustrative mockup — Progressive Robot

Solution – Primary Fix

Restore proper contexts and create minimal local policy module for necessary access.

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sudo restorecon -Rv /opt/myapp && sudo ausearch -m avc -ts recent | audit2allow -M myapp_local && sudo semodule -i myapp_local.pp
Illustrative mockup for oracle-linux-10 — selinux_policy_module
Creating a local SELinux policy module — Illustrative mockup — Progressive Robot

Solution – Alternative Approaches

Use approved SELinux booleans or align service paths to existing policy domains.

Verification & Acceptance Criteria

No new AVC denials during normal workload and service remains in enforcing mode.

Rollback Plan

Remove custom module and revert context changes if functionality regresses.

Prevention & Hardening

Include SELinux policy validation in release process; avoid running permissive in production.

See also permission denied despite 755 mode, bind failures, and mislabeled content.

Related tutorial: View the step-by-step tutorial for oracle-linux-10.

View all oracle-linux-10 tutorials on the Tutorials Hub →

Browse all common problems & solutions on the Tutorials Hub.

References & Further Reading

RHEL SELinux policy authoring and troubleshooting references.

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