What’s Vulnerable › Vulnerabilities

CVE-2021-3839

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-08-23 · updated 2026-06-17
• Weakness: CWE-125

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.

Affected products

• DPDK Data Plane Development Kit: before 22.03; 22.03-rc1, 22.03-rc2, 22.03-rc3 — fixed in 22.03
• Fedoraproject Fedora: 35
• Red Hat Enterprise Linux: 7.0, 8.0, 9.0
• RedHat Enterprise Linux Fast Datapath: 7.0, 8.0

How to fix

Upgrade to a fixed version: DPDK Data Plane Development Kit 22.03. Check the vendor advisory for mitigations.

References

• https://access.redhat.com/security/cve/CVE-2021-3839
• https://bugzilla.redhat.com/show_bug.cgi?id=2025882
• https://github.com/DPDK/dpdk/commit/6442c329b9d2ded0f44b27d2016aaba8ba5844c5
• https://access.redhat.com/security/cve/CVE-2021-3839
• https://bugzilla.redhat.com/show_bug.cgi?id=2025882
• https://github.com/DPDK/dpdk/commit/6442c329b9d2ded0f44b27d2016aaba8ba5844c5

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