# CVE-2026-86563: DPDK lib/vhost double-offset buffer size vulnerability

Source: https://junglewise.ai/threats/cve-2026-86563-a-flaw-was-found-in-dpdk-lib-vhost-a-double-offset-bug-in-vhost  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-14. Updated: 2026-11-02  
License: CC BY 4.0 with a link back

CVE-2026-86563 · Severity: high · CVSS 7.8 · Published 2026-10-14

DPDK's vhost library, used in virtualization platforms to enable virtual machine communication, contains a calculation error that can lead to incorrect memory access. A malicious guest virtual machine that controls vhost-user log mapping could exploit this flaw to read, modify, or corrupt host memory, potentially compromising the hypervisor and other guest systems.

Vendors: [DPDK](https://junglewise.ai/threats/vendors/dpdk).

## Quick answers

**Is CVE-2026-86563 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-86563 being exploited in the wild.

**How severe is CVE-2026-86563?** High severity, with a CVSS score of 7.8, published 14 October 2026.

**Which products and versions are affected?** DPDK Data Plane Development Kit <UNKNOWN>.

**Is there a fix for CVE-2026-86563?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-86563 attacked?** It is attacked with local access, in a software library.

**Am I affected by CVE-2026-86563?** Check whether you run DPDK Data Plane Development Kit at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A double-offset bug in the vhost log mapping calculation in DPDK's lib/vhost allows incorrect memory access. The vulnerability can be triggered by a malicious guest that controls vhost-user log mapping, requiring local attack vector with low privileges and no user interaction. An attacker gains high impact on confidentiality, integrity, and availability of the host system.

## Affected products

- DPDK Data Plane Development Kit <UNKNOWN>

## Timeline

- 2026-10-14: disclosed

## References

- [https://access.redhat.com/downloads/content/package-browser/](https://access.redhat.com/downloads/content/package-browser/)
- [https://access.redhat.com/security/cve/CVE-2026-86563](https://access.redhat.com/security/cve/CVE-2026-86563)