CVE-2021-3839

Name: CVE-2021-3839
Creator: NVD / NIST
Published: 2022-08-23T16:15:10.087+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.26%

Last modified Jun 17, 2026

CVE-2021-3839 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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. EPSS estimates a 1.26% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

1.26%

65.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions	Update
Dpdk	Data Plane Development Kit	< 22.03	—
Dpdk	Data Plane Development Kit	22.03	Rc1
Fedoraproject	Fedora	35	—
Redhat	Enterprise Linux	7.0	—
Redhat	Enterprise Linux	8.0	—
Redhat	Enterprise Linux	9.0	—
Redhat	Enterprise Linux Fast Datapath	7.0	—
Redhat	Enterprise Linux Fast Datapath	8.0	—

References

https://access.redhat.com/security/cve/CVE-2021-3839Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2025882Issue Tracking, Patch, Third Party Advisory
https://github.com/DPDK/dpdk/commit/6442c329b9d2ded0f44b27d2016aaba8ba5844c5Patch, Third Party Advisory
https://access.redhat.com/security/cve/CVE-2021-3839Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2025882Issue Tracking, Patch, Third Party Advisory
https://github.com/DPDK/dpdk/commit/6442c329b9d2ded0f44b27d2016aaba8ba5844c5Patch, Third Party Advisory

Timeline

Published: Aug 23, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-3839?

How severe is CVE-2021-3839?

CVE-2021-3839 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.26% probability of exploitation in the next 30 days.

How do I fix CVE-2021-3839?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-3839?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST