Vulnerability record · CVE-2021-3839 · published 23 August 2022

CVE-2021-3839: Dpdk data plane development kit out-of-bounds read vulnerability

Dpdk · Data Plane Development Kit

A flaw was found in the vhost library in DPDK. Function vhost_user_set_inflight_fd() does not validate `msg->payload.inflight.num_queues`, possibly causing out-of-bounds memory read/write. Any software using DPDK vhost library may crash as a result of this vulnerability.

7.5 CVSS 3.1 High EPSS 1.6% · top 25.3% CWE-125 · Out-of-bounds readCWE-787 · Out-of-bounds write

7.5CVSS 3.1 base score

1.6%EPSS exploitation probability, 30 days

NoNot in CISA KEV

4Affected product versions listed by NVD

6References

17 Jun 2026Last modified by NVD

Description

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

Affected products

4 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

Data Plane Development Kit Dpdk

Fedora Fedoraproject

Enterprise Linux Redhat

Enterprise Linux Fast Datapath Redhat

References

Link	Tags
https://access.redhat.com/security/cve/CVE-2021-3839	Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2025882	Issue TrackingPatchThird Party Advisory
https://github.com/DPDK/dpdk/commit/6442c329b9d2ded0f44b27d2016aaba8ba5844c5	PatchThird Party Advisory
https://access.redhat.com/security/cve/CVE-2021-3839	Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2025882	Issue TrackingPatchThird Party Advisory
https://github.com/DPDK/dpdk/commit/6442c329b9d2ded0f44b27d2016aaba8ba5844c5	PatchThird Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2021-3839), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.