CVE-2026-113496 Red Hat CVE debrief

Who should care

System administrators and security teams responsible for Red Hat Enterprise Linux 9 and 10 systems using cockpit-machines should assess exposure and prioritize mitigation to prevent potential unauthorized access to guest virtual machine graphical consoles. They should verify patch application and system configuration, and review compensating controls for exposed systems.

Why it matters

Defenders should care about CVE-2026-113496 because it allows a local unprivileged attacker to read the exposed VNC console password from the process list in cockpit-machines, potentially leading to unauthorized access to guest virtual machine graphical consoles. System administrators and security teams responsible for Red Hat Enterprise Linux 9 and 10 systems using cockpit-machines should assess exposure and prioritize mitigation.

• Potential unauthorized access to guest virtual machine graphical consoles
• Exposure of sensitive VNC console passwords
• Increased risk of lateral movement within the network
• Need for verification of patch application and system configuration

Technical summary

The vulnerability in cockpit-machines allows a local unprivileged attacker to read the exposed VNC console password from the process list while another user modifies settings. This can lead to unauthorized access to the guest virtual machine's graphical console. The vulnerability exists due to insecure handling of VNC console settings, allowing an attacker to exploit this weakness. The affected product is cockpit-machines, and the vulnerability has been confirmed through the CVE Program record and supplemental source references.

Defensive priority

Defenders should prioritize verifying and mitigating this vulnerability in Red Hat Enterprise Linux 9 and 10 systems using cockpit-machines.

Recommended defensive actions

• Verify and apply patches or updates for cockpit-machines on Red Hat Enterprise Linux 9 and 10 systems
• Restrict access to the VNC console and ensure proper authentication and authorization
• Monitor system logs and process lists for potential exploitation attempts
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and source item provide details on the vulnerability in cockpit-machines, including its impact and affected systems. Evidence is based on the CVE Program record and supplemental source references. The vulnerability allows a local unprivileged attacker to read the exposed VNC console password from the process list while another user modifies settings. The source item and CVE record confirm the vulnerability's existence and provide details on its impact. Defenders should verify patch application and system configuration.

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.