Remediate CVE-2026-31431 on ZStack Cloud Hosts

Scenario

• Product: ZCF
• Components: ZCE-X, ZStack Cloud
• ZCE-X version: 5.2.x
• ZStack Cloud version: 4.8.x
• Trigger: A scan detects the local high-risk privilege-escalation vulnerability CVE-2026-31431, requiring the official Kylin temporary mitigation.

Symptoms

• The target host is affected by CVE-2026-31431.
• The remediation applies to the host operating-system kernel layer.
• The procedure can require host restart.

Assessment

1. Confirm the maintenance window and host-migration arrangement before remediation.
2. Verify that the algif_aead