CVE-2026-86562 Red Hat CVE debrief

Who should care

Defenders responsible for Red Hat Fast Datapath for RHEL and OpenShift Container Platform deployments should assess exposure and apply patches from Red Hat for affected versions. They should also monitor for potential exploitation attempts and verify the integrity of affected systems. Additionally, security teams and vulnerability management teams should review the vulnerability and prioritize patching efforts.

Why it matters

CVE-2026-86562 is a TOCTOU double-fetch vulnerability in DPDK lib/vhost that can lead to a heap buffer overflow. Defenders should verify and apply patches, assess exposure, and monitor for exploitation attempts.

• Verify and apply patches to prevent potential exploitation
• Assess exposure of affected systems to prioritize patching
• Monitor for potential exploitation attempts to detect possible attacks

Technical summary

The vulnerability exists in DPDK lib/vhost due to a TOCTOU double-fetch of control-queue descriptors, which can lead to a heap buffer overflow with attacker-controlled content in the VDUSE control-queue handler. This issue affects Red Hat Fast Datapath for RHEL and OpenShift Container Platform deployments. Defenders should prioritize verifying and applying patches from Red Hat for affected versions.

Defensive priority

Defenders should prioritize verifying and applying patches from Red Hat for affected versions of Fast Datapath for RHEL and OpenShift Container Platform.

Recommended defensive actions

• Verify and apply patches from Red Hat for affected versions of Fast Datapath for RHEL and OpenShift Container Platform
• Inventory and assess exposure of affected systems
• Monitor for potential exploitation attempts

Evidence notes

The CVE record and NVD entry provide details on the vulnerability. Red Hat has provided advisories and patches for affected products. Defenders should verify and apply patches, assess exposure, and monitor for exploitation attempts. The vulnerability was publicly disclosed on 2026-10-14 and has not been modified since then. There are no known reports of exploitation in the wild.

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.