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Fencer Vulns
high 7.5

CVE-2021-3839 json

A flaw was found in the vhost library in DPDK.

published 2022-08-23 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-27085

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.7%
EPSS 1.7% chance of exploitation in 30 days, percentile 77%
public exploits
0
none known

Summary

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.

Patch / fix

  • dpdk data_plane_development_kit 22.03
  • dpdk Debian 14, Debian 13, Debian 12 20.11.5-1

debian advisories DEBIAN-CVE-2021-3839

  • dpdk Ubuntu 20.04 LTS 19.11.12-0ubuntu0.20.04.1
  • dpdk Ubuntu 22.04 LTS 21.11.1-0ubuntu0.3

ubuntu advisories UBUNTU-CVE-2021-3839

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • dpdk RHEL 9 2:21.11.2-1.el9_1
  • dpdk-tools RHEL 9 2:21.11.2-1.el9_1
  • openvswitch2.13 RHEL 8 2.13.0-180.el8fdp
  • openvswitch2.16 RHEL 8 2.16.0-74.el8fdp
  • openvswitch2.15 RHEL 8 2.15.0-99.el8fdp

red hat advisories RHSA-2022:8263RHSA-2022:4786RHSA-2022:4788RHSA-2022:4787

  • dpdk SLES for SAP 15 SP2, SLES 15 SP2-LTSS, SLES 15 SP2-BCL +6 more 19.11.4-150200.3.17.1
  • dpdk-thunderx SLES 15 SP2-LTSS, SLE High Performance Computing 15 SP2-LTSS, SLE High Performance Computing 15 SP2-ESPOS +1 more 19.11.4-150200.3.17.1
  • dpdk SLE Module for Server Applications 15 SP3, openSUSE Leap 15.4, openSUSE Leap 15.3 19.11.4-150300.11.1
  • dpdk-thunderx SLE Module for Server Applications 15 SP3, openSUSE Leap 15.4, openSUSE Leap 15.3 19.11.4-150300.11.1

suse advisories SUSE-SU-2022:2273-1SUSE-SU-2022:1892-1

  • dpdk AlmaLinux 9 2:21.11.2-1.el9_1
  • dpdk-tools AlmaLinux 9 2:21.11.2-1.el9_1

almalinux advisories ALSA-2022:8263

  • dpdk Rocky Linux 9 2:21.11.2-1.el9_1

rocky linux advisories RLSA-2022:8263

  • dpdk Arch Linux 22.03-1

arch linux advisories AVG-2697

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-3839 updated cvss 7.5

DPDK: out-of-bounds read/write in vhost_user_set_inflight_fd() may lead to crash

  • Red Hat Fast Datapath for RHEL 7 openvswitch, openvswitch2.13, openvswitch2.15, openvswitch-test, python-openvswitch, openvswitch-ovn-host, +7 more Red Hat Enterprise Linux 7 dpdk
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 8 dpdk, dpdk-tools Red Hat Virtualization 4 openvswitch2.11, openvswitch2.11-test, python-openvswitch2.11
    affected: workaround, no fix planned “Will not fix”
  • Red Hat Fast Datapath for Red Hat Enterprise Linux 8 openvswitch2.15 2.15.0-99.el8fdp, openvswitch2.16 2.16.0-74.el8fdp, openvswitch2.13 2.13.0-180.el8fdp
    fixed: vendor fix RHSA-2022:4786
  • Red Hat Enterprise Linux AppStream (v. 9) dpdk 21.11.2-1.el9_1, dpdk-tools 21.11.2-1.el9_1
    fixed: vendor fix RHSA-2022:8263
  • Red Hat Fast Datapath for Red Hat Enterprise Linux 8 openvswitch2.15-test 2.15.0-99.el8fdp, openvswitch2.16-test 2.16.0-74.el8fdp, openvswitch2.13-test 2.13.0-180.el8fdp, openvswitch2.15-ipsec 2.15.0-99.el8fdp, openvswitch2.16-ipsec 2.16.0-74.el8fdp, openvswitch2.13-ipsec 2.13.0-180.el8fdp, +6 more Red Hat Fast Datapath for RHEL 7 openvswitch2.11, openvswitch2.11-test, python-openvswitch2.11 Red Hat Fast Datapath for RHEL 8 openvswitch2.11, openvswitch2.17, openvswitch2.11-test, openvswitch2.17-test, openvswitch2.17-ipsec, python3-openvswitch2.11, +3 more Red Hat Ceph Storage 3 ceph, librbd1, librgw2, ceph-mds, ceph-mgr, ceph-mon, +15 more Red Hat Ceph Storage 4 ceph, librbd1, librgw2, rbd-nbd, ceph-mds, ceph-mgr, +27 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.70% chance of exploitation in the next 30 days, higher than 77% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • n/a dpdk

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.