CVE-2021-3839
HIGHCVSS 7.5/10EPSS 1.26%
Last modified
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/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-3839?
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.
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.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2021-3839?
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Scan your code nowSource: NVD / NIST