CVE-2026-86856

Dpdk: dpdk: stack and heap buffer overflow in nfp vdpa driver

publishedCWE-787

A flaw was found in the DPDK nfp vDPA driver. Stack and heap buffers sized for a single queue pair can be overflowed when more virtqueues are configured, leading to a host crash or memory corruption.

Technical severity6.5 mediumCVSS 3.1 · CNA: redhat

Published2026-10-14Source updated 2026-11-03

Collected2026-11-032 attributed sources

Fixes and workarounds

Workaround

Avoid using the nfp vDPA driver in production until patched. Do not attach untrusted guests to an NFP VF running with class=vdpa.

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

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-2026-86856CNA: redhat · vdb-entry, x_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2529897CNA: redhat · issue-tracking, x_refsource_REDHAT

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