CVE-2026-109832 Red Hat CVE debrief

Who should care

Red Hat Enterprise Linux 8, 9, and 10 users and administrators who have VNC TLS listeners enabled should verify their exposure and assess the need for compensating controls or monitoring.

Why it matters

Defenders should care about this vulnerability because it allows a remote attacker to cause high CPU usage with no forward progress, potentially disrupting or degrading service. Red Hat Enterprise Linux 8, 9, and 10 users and administrators who have VNC TLS listeners enabled should verify their exposure and assess the need for compensating controls or monitoring. The impact of this vulnerability requires verification from the supplied official sources, and remediation priority should be determined based on the specific deployment context.

• Denial of service through high CPU usage
• Potential for service disruption or degradation

Technical summary

The gnome-remote-desktop component in Red Hat Enterprise Linux 8, 9, and 10 is vulnerable to a denial-of-service attack. The VNC TLS I/O handlers handle retryable GnuTLS results (GNUTLS_E_AGAIN and GNUTLS_E_INTERRUPTED) with an unbounded busy loop instead of yielding to the event loop. A remote attacker who can reach an enabled VNC TLS listener can cause the event-loop thread to spin at high CPU with no forward progress.

Defensive priority

Defenders should prioritize verifying exposure of VNC TLS listeners in Red Hat Enterprise Linux 8, 9, and 10 deployments, and assess the need for compensating controls or monitoring.

Recommended defensive actions

• Verify VNC TLS listener exposure in Red Hat Enterprise Linux 8, 9, and 10 deployments
• Assess the need for compensating controls or monitoring
• Review and apply vendor remediation when available
• 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
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed

Evidence notes

The CVE Program record and NVD vulnerability detail provide official information on the vulnerability. Red Hat has also provided a reference for the CVE. Defenders should verify the exposure of VNC TLS listeners in Red Hat Enterprise Linux 8, 9, and 10 deployments and assess the need for compensating controls or monitoring. The official sources indicate that this vulnerability allows a remote attacker to cause high CPU usage with no forward progress. However, the exact scope and severity require verification based on specific Red Hat

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.