Critical [CVE-2026-84638] instance group attachment to schedules and workflow job template nodes checks only read permission, allowing use of restricted (controlplane / other-tenant) instance groups and privilege escalation…
This critical-severity Red Hat Linux advisory covers CVE-2026-84638; related products: Red Hat Ansible Automation Platform 2.4 for RHEL 8, Red Hat Ansible Automation Platform 2.4 for RHEL 9, Red Hat Ansible Automation Platform 2.5 for RHEL 8.
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Summary
instance group attachment to schedules and workflow job template nodes checks only read permission, allowing use of restricted (controlplane / other-tenant) instance groups and privilege escalation to control-plane code execution. Red Hat rates this critical (CVSS 9.9).
Weakness: CWE-863. Red Hat lists fixing advisory RHSA-2026:71177 with package automation-controller-0:4.5.36-1.el8ap, automation-controller-0:4.5.36-1.el9ap, ansible-automation-platform-27/controller-rhel9:1789580684, automation-controller-0:4.7.17-1.el9ap.
Affected products named by the advisory: Red Hat Ansible Automation Platform 2.4 for RHEL 8; Red Hat Ansible Automation Platform 2.4 for RHEL 9; Red Hat Ansible Automation Platform 2.5 for RHEL 8; Red Hat Ansible Automation Platform 2.5 for RHEL 9; and 2 more.
Affected products named by the advisory: Red Hat Ansible Automation Platform 2.6 for RHEL 9; Red Hat Ansible Automation Platform 2.7.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 7 days ago·verify at source
- automation-controller-0:4.5.36-1.el8ap
- automation-controller-0:4.5.36-1.el9ap
- ansible-automation-platform-27/controller-rhel9:1789580684
- automation-controller-0:4.7.17-1.el9ap
- automation-controller-0:4.6.33-1.el9ap
- automation-controller-0:4.6.33-1.el8ap
- ansible-automation-platform-26/controller-rhel9:1789673739
- RHSA-2026:71177
Official advisory · high-confidence parse· fetched 7 days ago·verify at source
Mitigation
Upgrade to a fixed release: automation-controller-0:4.5.36-1.el8ap, automation-controller-0:4.5.36-1.el9ap, ansible-automation-platform-27/controller-rhel9:1789580684, automation-controller-0:4.7.17-1.el9ap, automation-controller-0:4.6.33-1.el9ap, automation-controller-0:4.6.33-1.el8ap. That is the remediation for this advisory.
The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.
Official advisory · high-confidence parse· fetched 7 days ago·verify at source
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