# CVE-2026-86565: DPDK lib/vhost out-of-bounds write in virtqueue handling

Source: https://junglewise.ai/threats/cve-2026-86565-a-flaw-was-found-in-dpdk-lib-vhost-a-guest-can-desynchronize  
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-2026-86565 · Severity: high · CVSS 8.2 · Published 2026-10-14

DPDK is a data packet processing library used in virtualized environments to handle network I/O. A malicious guest VM with vhost-user block or SCSI devices can trigger an out-of-bounds write in the host system's vhost process, potentially allowing arbitrary code execution or denial of service on the host system.

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

## Quick answers

**Is CVE-2026-86565 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-86565 being exploited in the wild.

**How severe is CVE-2026-86565?** High severity, with a CVSS score of 8.2, published 14 October 2026.

**Which products and versions are affected?** DPDK <UNKNOWN>.

**Is there a fix for CVE-2026-86565?** 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-2026-86565 attacked?** It is attacked with local access, in a software library.

**Am I affected by CVE-2026-86565?** Check whether you run DPDK 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 flaw in DPDK's lib/vhost component allows a malicious guest to desynchronize virtqueue size from the inflight descriptor table size, triggering an out-of-bounds write in the host vhost process. This requires guest-level access with a vhost-user-blk or vhost-user-scsi device configured with the inflight feature. The vulnerability affects the host hypervisor process and can lead to information disclosure, code execution, or denial of service.

## Affected products

- DPDK DPDK <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-2026-86565](https://access.redhat.com/security/cve/CVE-2026-86565)

## Related threats

- [DPDK vhost-crypto integer overflow in lib/vhost](https://junglewise.ai/threats/cve-2026-86849-a-flaw-was-found-in-dpdk-lib-vhost-vhost-crypto-integer-overflow)
- [DPDK vhost-crypto indirect-descriptor double-fetch out-of-bounds](https://junglewise.ai/threats/cve-2026-86848-a-flaw-was-found-in-dpdk-lib-vhost-vhost-crypto-the-indirect)
- [DPDK vhost-crypto uninitialized pointer in write-back chain](https://junglewise.ai/threats/cve-2026-86847-a-flaw-was-found-in-dpdk-lib-vhost-vhost-crypto-write-back-chain)
- [DPDK vhost-crypto out-of-bounds write via unchecked descriptor index](https://junglewise.ai/threats/cve-2026-86846-a-flaw-was-found-in-dpdk-lib-vhost-vhost-crypto-a-guest-can)
- [DPDK lib/vhost use-after-free in VDUSE handler](https://junglewise.ai/threats/cve-2026-86567-a-flaw-was-found-in-dpdk-lib-vhost-the-vduse-handler-fails-to)