# CVE-2026-86565: Dpdk: dpdk: guest can desynchronize virtqueue size from inflight descriptor table size, causing out-of-bounds write

Status: published. Published: 2026-10-14. Updated: 2026-11-02.

A flaw was found in DPDK lib/vhost. A guest can desynchronize virtqueue size from inflight descriptor table size, causing an out-of-bounds write in the host vhost process.

## Remediation

- workaround: No mitigation is currently available. (source: CNA: redhat)

## Affected products and versions

- Red Hat / Fast Datapath for RHEL 10 (grout): Version range not reported. Source: CNA: redhat
- Red Hat / Fast Datapath for RHEL 10 (openvswitch3.5): Version range not reported. Source: CNA: redhat
- Red Hat / Fast Datapath for RHEL 10 (openvswitch3.6): Version range not reported. Source: CNA: redhat
- Red Hat / Fast Datapath for RHEL 8 (openvswitch2.11): Version range not reported. Source: CNA: redhat
- Red Hat / Fast Datapath for RHEL 8 (openvswitch2.12): Version range not reported. Source: CNA: redhat
- Red Hat / Fast Datapath for RHEL 8 (openvswitch2.13): Version range not reported. Source: CNA: redhat
- Red Hat / Fast Datapath for RHEL 8 (openvswitch2.15): Version range not reported. Source: CNA: redhat
- Red Hat / Fast Datapath for RHEL 8 (openvswitch2.16): Version range not reported. Source: CNA: redhat
- Red Hat / Fast Datapath for RHEL 8 (openvswitch2.17): Version range not reported. Source: CNA: redhat
- Red Hat / Fast Datapath for RHEL 8 (openvswitch3.1): Version range not reported. Source: CNA: redhat
- Red Hat / Fast Datapath for RHEL 9 (grout): Version range not reported. Source: CNA: redhat
- Red Hat / Fast Datapath for RHEL 9 (openvswitch2.17): Version range not reported. Source: CNA: redhat
- Red Hat / Fast Datapath for RHEL 9 (openvswitch3.0): Version range not reported. Source: CNA: redhat
- Red Hat / Fast Datapath for RHEL 9 (openvswitch3.1): Version range not reported. Source: CNA: redhat
- Red Hat / Fast Datapath for RHEL 9 (openvswitch3.2): Version range not reported. Source: CNA: redhat
- Red Hat / Fast Datapath for RHEL 9 (openvswitch3.3): Version range not reported. Source: CNA: redhat
- Red Hat / Fast Datapath for RHEL 9 (openvswitch3.4): Version range not reported. Source: CNA: redhat
- Red Hat / Fast Datapath for RHEL 9 (openvswitch3.5): Version range not reported. Source: CNA: redhat
- Red Hat / Fast Datapath for RHEL 9 (openvswitch3.6): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 10 (dpdk): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8 (dpdk): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9 (dpdk): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift Container Platform 4 (openvswitch2.17): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift Container Platform 4 (openvswitch3.0): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift Container Platform 4 (openvswitch3.1): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenStack Platform 13 (Queens) (openvswitch): Version range not reported. Source: CNA: redhat

## Severity and prioritization

- CVSS 3.1: 8.2 (high); CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H; source: CNA: redhat

- CISA KEV: No listing in collected sources

- EPSS: 0.16% as of 2026-11-01; percentile 5.20%

- SSVC: exploitation none; automatable no; technical impact total; source ADP: CISA-ADP

- Weaknesses: CWE-787

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://access.redhat.com/security/cve/CVE-2026-86565 (CNA: redhat; vdb-entry, x_refsource_REDHAT)

- https://bugzilla.redhat.com/show_bug.cgi?id=2529683 (CNA: redhat; issue-tracking, x_refsource_REDHAT)

## Provenance

- CNA: redhat: https://www.cve.org/CVERecord?id=CVE-2026-86565; retrieved 2026-11-02; source updated 2026-11-02

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-86565; retrieved 2026-11-02; source updated Not reported

Revision: 98917b6aeb7f5c6263ef40d001c8726cf9f780edc6d62d98838b9eed0eeb7458

Canonical: https://y2.dev/cve/CVE-2026-86565