6.5 Medium

CVE-2026-86566 Dpdk: dpdk: guest with runt rx descriptors underflows copy length in vhost enqueue (split and packed rings)

Description

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.

CVSS 3.1 detail

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

Exploitable with local access to the machine, with an ordinary account and without any user action; an attacker can seriously compromise confidentiality, integrity or availability.

Attack vector: Local
Attack complexity: Low
Privileges required: Low
Interaction: None
Scope: Changed
Confidentiality: None
Integrity: None
Availability: High

Affected products and versions

Product	Affected versions	Fixed in
Fast Datapath for RHEL 10	Versions not published
Fast Datapath for RHEL 8	Versions not published
Fast Datapath for RHEL 9	Versions not published
Red Hat Enterprise Linux 10	Versions not published
Red Hat Enterprise Linux 8	Versions not published
Red Hat Enterprise Linux 9	Versions not published
Red Hat OpenShift Container Platform 4	Versions not published
Red Hat OpenStack Platform 13 (Queens)	Versions not published

References

RHSA-2026:94629 access.redhat.com
RHSA-2026:94630 access.redhat.com
access.redhat.com access.redhat.com
RHBZ#2529684 bugzilla.redhat.com

Timeline

Published October 14, 2026
Last modified November 6, 2026

The 18 CVEs of Fast Datapath for RHEL 10 →

CVE-2026-86849 Dpdk: dpdk: integer overflow combined with missing validation leads to host buffer overflow in vhost-crypto 6.5 Medium CVE-2026-86856 Dpdk: dpdk: stack and heap buffer overflow in nfp vdpa driver 6.5 Medium CVE-2026-86847 Dpdk: dpdk: guest can trigger infinite loop in vhost-crypto writeback chain cleanup 6.5 Medium CVE-2026-86846 Dpdk: dpdk: guest can trigger out-of-bounds write by controlling avail ring index in vhost-crypto 6.5 Medium

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