CVE-2026-86856

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Buffer Overflow in DPDK nfp vDPA Driver

Publication date: 2026-10-14

Last updated on: 2026-11-06

Assigner: redhat-SADP

Description

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.

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Meta Information

Published

2026-10-14

Last Modified

2026-11-06

Generated

2026-11-08

AI Q&A

2026-10-15

EPSS Evaluated

2026-11-07

NVD

CVE-2026-86856

EUVD

EUVD-2026-101512

Affected Vendors & Products

Vendor	Product	Version / Range
Red Hat	Fast Datapath for RHEL 10	*
Red Hat	Fast Datapath for RHEL 8	*
Red Hat	Fast Datapath for RHEL 9	*
Red Hat	Red Hat Enterprise Linux 10	*
Red Hat	Red Hat Enterprise Linux 8	*
Red Hat	Red Hat Enterprise Linux 9	*
Red Hat	Red Hat OpenShift Container Platform 4	*
Red Hat	Red Hat OpenStack Platform 13 (Queens)	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-787	The product writes data past the end, or before the beginning, of the intended buffer.

Attack-Flow Graph

Executive Summary

This vulnerability is an out-of-bounds write flaw in the DPDK nfp vDPA driver. Buffers are sized for a single queue pair but can be overflowed when more virtqueues are configured, potentially causing a host crash or memory corruption.

Detection Guidance

To detect this vulnerability, check if the nfp vDPA driver is loaded and if any guest VMs are attached to NFP vDPA devices with class=vdpa. Inspect DPDK logs for buffer overflow warnings or crashes. Commands like lsmod | grep nfp_vdpa and dmesg | grep -i overflow may help identify affected systems.

Impact Analysis

A guest with access to an NFP vDPA device can trigger buffer overflows, leading to host crashes or memory corruption. This may disrupt services and compromise system stability.

Compliance Impact

This vulnerability could lead to host crashes or memory corruption, which may cause data loss or unauthorized access. Such disruptions could violate GDPR's integrity and availability principles or HIPAA's security requirements for data protection and system availability.

Mitigation Strategies

Avoid using the nfp vDPA driver in production until a patch is available. Do not attach untrusted guests to NFP VF devices running with class=vdpa. Monitor vendor advisories for updates and consider disabling the nfp vDPA PMD module if possible.

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