CVE-2026-86566

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

publishedCWE-191

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.

Technical severity6.5 mediumCVSS 3.1 · CNA: redhat

Published2026-10-14Source updated 2026-11-06

Collected2026-11-063 attributed sources

Fixes and workarounds

Workaround

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

Source: CNA: redhat

Affected products and versions

Affected products, source version ranges and reporting authorities
Product	Versions	Authority
Red Hat Enterprise Linux 10 Red Hat `dpdk` https://access.redhat.com/downloads/content/package-browser/	≥ 2:25.11-2.el10_2; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 9 Red Hat `dpdk` https://access.redhat.com/downloads/content/package-browser/	≥ 2:25.11-2.el9_8; < * (unaffected, rpm) Other versions: affected	CNA: redhat
Fast Datapath for RHEL 10 Red Hat `grout` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: affected	CNA: redhat
Fast Datapath for RHEL 10 Red Hat `openvswitch3.5` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: affected	CNA: redhat
Fast Datapath for RHEL 10 Red Hat `openvswitch3.6` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: affected	CNA: redhat
Fast Datapath for RHEL 8 Red Hat `openvswitch2.11` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: affected	CNA: redhat
Fast Datapath for RHEL 8 Red Hat `openvswitch2.12` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: affected	CNA: redhat
Fast Datapath for RHEL 8 Red Hat `openvswitch2.13` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: affected	CNA: redhat
Fast Datapath for RHEL 8 Red Hat `openvswitch2.15` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: affected	CNA: redhat
Fast Datapath for RHEL 8 Red Hat `openvswitch2.16` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: affected	CNA: redhat
Fast Datapath for RHEL 8 Red Hat `openvswitch2.17` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: affected	CNA: redhat
Fast Datapath for RHEL 8 Red Hat `openvswitch3.1` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: affected	CNA: redhat
Fast Datapath for RHEL 9 Red Hat `grout` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: affected	CNA: redhat
Fast Datapath for RHEL 9 Red Hat `openvswitch2.17` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: affected	CNA: redhat
Fast Datapath for RHEL 9 Red Hat `openvswitch3.0` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: affected	CNA: redhat
Fast Datapath for RHEL 9 Red Hat `openvswitch3.1` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: affected	CNA: redhat
Fast Datapath for RHEL 9 Red Hat `openvswitch3.2` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: affected	CNA: redhat
Fast Datapath for RHEL 9 Red Hat `openvswitch3.3` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: affected	CNA: redhat
Fast Datapath for RHEL 9 Red Hat `openvswitch3.4` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: affected	CNA: redhat
Fast Datapath for RHEL 9 Red Hat `openvswitch3.5` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: affected	CNA: redhat
Fast Datapath for RHEL 9 Red Hat `openvswitch3.6` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: affected	CNA: redhat
Red Hat Enterprise Linux 8 Red Hat `dpdk` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: affected	CNA: redhat
Red Hat OpenShift Container Platform 4 Red Hat `openvswitch2.17` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: affected	CNA: redhat
Red Hat OpenShift Container Platform 4 Red Hat `openvswitch3.0` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: affected	CNA: redhat
Red Hat OpenShift Container Platform 4 Red Hat `openvswitch3.1` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: affected	CNA: redhat
Red Hat OpenStack Platform 13 (Queens) Red Hat `openvswitch` https://access.redhat.com/downloads/content/package-browser/	Range not reported Other versions: affected	CNA: redhat

Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.

CVSS assessments

CVSS scores, vectors and reporting authorities
Version / score	Vector	Authority
3.1 / 6.5 medium	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H`	CNA: redhat
3.1 / 6.5 medium	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H`	NVD: [email protected]

Exploit evidence

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

References

https://access.redhat.com/errata/RHSA-2026:94629CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:94630CNA: redhat · vendor-advisory, x_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-86566CNA: redhat · vdb-entry, x_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2529684CNA: redhat · issue-tracking, x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:94629[email protected]
https://access.redhat.com/errata/RHSA-2026:94630[email protected]
https://access.redhat.com/security/cve/CVE-2026-86566[email protected]
https://bugzilla.redhat.com/show_bug.cgi?id=2529684[email protected]

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