---
id: CVE-2026-86565
title: A flaw was found in DPDK lib/vhost
summary: >-
  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.
severity: high
cvss: 8.2
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H'
cwe:
  - CWE-787
vendor: Red Hat
product: grout
affected:
  - grout (all versions)
  - openvswitch3.5 (all versions)
  - openvswitch3.6 (all versions)
  - openvswitch2.11 (all versions)
  - openvswitch2.12 (all versions)
  - openvswitch2.13 (all versions)
  - openvswitch2.15 (all versions)
  - openvswitch2.16 (all versions)
  - openvswitch2.17 (all versions)
  - openvswitch3.1 (all versions)
  - grout (all versions)
  - openvswitch2.17 (all versions)
  - openvswitch3.0 (all versions)
  - openvswitch3.1 (all versions)
  - openvswitch3.2 (all versions)
  - openvswitch3.3 (all versions)
  - openvswitch3.4 (all versions)
  - openvswitch3.5 (all versions)
  - openvswitch3.6 (all versions)
  - dpdk (all versions)
  - dpdk (all versions)
  - dpdk (all versions)
  - openvswitch2.17 (all versions)
  - openvswitch3.0 (all versions)
  - openvswitch3.1 (all versions)
  - openvswitch (all versions)
published: '2026-10-14'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T16:18:21.997'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-86565'
references:
  - url: 'https://access.redhat.com/security/cve/CVE-2026-86565'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2529683'
    label: secalert@redhat.com
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-86565.json
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-86565'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-86565'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-15T13:53:24.414124Z'
ingestedAt: '2026-10-14T17:44:53.679Z'
epss: 0.00167
epssPercentile: 0.05934
---

## Overview

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

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **Red Hat VEX** · Important · affected: Fast Datapath for RHEL 10, Fast Datapath for RHEL 8, Fast Datapath for RHEL 9, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, … · no fix planned: Fast Datapath for RHEL 10, Fast Datapath for RHEL 8, Fast Datapath for RHEL 9, Red Hat Enterprise Linux 10, … · updated 2026-10-16 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-86565.json)