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PatchSiren cyber security CVE debrief

CVE-2026-86566 Red Hat CVE debrief

A flaw in DPDK lib/vhost allows a guest with runt RX descriptors to underflow the copy length in vhost enqueue, potentially causing a denial of service in shared vhost backends like OVS-DPDK. This vulnerability affects systems using DPDK and vhost-based services. The issue is related to the handling of vhost enqueue operations. Defenders managing these systems should assess exposure and prioritize updates and configuration reviews. The CVE record and source item provide details on the vulnerability, but specific version information and detailed impact assessments are limited. To address this, defenders should verify and update affected systems, review configurations, and monitor v

Vendor
Red Hat
Product
Fast Datapath for RHEL 10
CVSS
MEDIUM 6.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-14
Original CVE updated
2026-10-14
Advisory published
2026-10-14
Advisory updated
2026-10-14

Who should care

Defenders managing systems using DPDK, vhost-based services, and shared vhost backends like OVS-DPDK should assess exposure and prioritize updates and configuration reviews.

Why it matters

CVE-2026-86566 is a vulnerability in DPDK lib/vhost that can cause denial of service in shared vhost backends. Defenders should verify and update affected systems, review configurations, and monitor for potential attacks.

  • Potential denial of service in shared vhost backends
  • Need for verification of affected systems and versions
  • Possible impact on OVS-DPDK configurations
  • Requires review of vhost enqueue operations and configurations

Technical summary

The vulnerability in DPDK lib/vhost allows a guest with runt RX descriptors to underflow the copy length in vhost enqueue. This can cause a denial of service in shared vhost backends such as OVS-DPDK. The issue is related to the handling of vhost enqueue operations.

Defensive priority

Defenders should prioritize verifying and updating affected systems, particularly those using DPDK and vhost-based services.

Recommended defensive actions

  • Verify and update affected systems using DPDK and vhost-based services
  • Review and adjust configurations for shared vhost backends like OVS-DPDK
  • Monitor for potential denial of service attempts

Evidence notes

The CVE record and source item provide details on the vulnerability in DPDK lib/vhost. However, specific version information and detailed impact assessments are limited.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-86566 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-86566

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-86566 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-86566

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental 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.