CVE-2026-11837 Red Hat CVE debrief

Who should care

Operators and administrators of Red Hat Enterprise Linux 10 systems using the ansible.posix authorized_key module should assess exposure and verify the presence of mitigating controls.

Why it matters

CVE-2026-11837 is a local privilege escalation vulnerability in the ansible.posix authorized_key module. Operators and administrators of Red Hat Enterprise Linux 10 systems should assess exposure and verify the presence of mitigating controls. Verification of module configurations and implementation of additional security controls are required to prevent potential exploitation. Remediation priority is high for affected systems.

• Verification of ansible.posix authorized_key module configurations is required to prevent potential local privilege escalation.
• Operators and administrators must assess exposure and implement additional security controls to prevent exploitation.
• Remediation priority is high for Red Hat Enterprise Linux 10 systems using the vulnerable module.

Technical summary

The ansible.posix authorized_key module uses os.chown() instead of os.lchown() and opens files without O_NOFOLLOW, allowing an unprivileged local user to pre-stage symbolic links in their ~/.ssh directory to redirect file ownership changes to arbitrary system paths when an operator runs the authorized_key task as root. This vulnerability affects Red Hat Enterprise Linux 10 systems using the ansible.posix authorized_key module, and operators and administrators should assess exposure and verify the presence of mitigating controls. Verification of module configurations and implementation of additional security controls are required to prevent potential exploitation.

Defensive priority

Operators and administrators of Red Hat Enterprise Linux 10 systems using the ansible.posix authorized_key module should assess exposure and verify the presence of mitigating controls.

Recommended defensive actions

• Review and update ansible.posix authorized_key module configurations to use os.lchown() and O_NOFOLLOW when managing SSH authorized keys.
• Implement additional security controls to prevent unprivileged local users from pre-staging symbolic links in ~/.ssh directories.
• Monitor system logs for suspicious activity related to the authorized_key task.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, including its description, CVSS score, and affected products. Red Hat has provided references to their security advisory and bugzilla entry for further information.

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.