---
id: CVE-2026-86566
title: A flaw was found in DPDK lib/vhost
summary: >-
  A flaw was found in DPDK lib/vhost. A guest with runt RX descriptors can
  underflow the copy length in vhost enqueue, causing a denial of service in a
  shared vhost backend such as OVS-DPDK.
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H'
cwe:
  - CWE-191
published: '2026-10-14'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T20:17:59.953'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-86566'
references:
  - url: 'https://access.redhat.com/security/cve/CVE-2026-86566'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2529684'
    label: secalert@redhat.com
tags:
  - nvd
ingestedAt: '2026-10-14T18:47:39.317Z'
---

## Overview

A flaw was found in DPDK lib/vhost. A guest with runt RX descriptors can underflow the copy length in vhost enqueue, causing a denial of service in a shared vhost backend such as OVS-DPDK.

## Remediation

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