# CVE-2026-86561: DPDK lib/vhost memory validation flaw leading to crash

Source: https://junglewise.ai/threats/cve-2026-86561-a-flaw-was-found-in-dpdk-lib-vhost-memory-size-is-not-adequately  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-14. Updated: 2026-10-20  
License: CC BY 4.0 with a link back

CVE-2026-86561 · Severity: medium · CVSS 6.5 · Published 2026-10-14

DPDK is a library used in network applications and virtualization to handle packet processing. A flaw in the vhost component fails to validate memory sizes before allocating memory, allowing a malicious guest with control over vhost-user messages to crash the host system or corrupt memory. This can disrupt critical network services or virtualized infrastructure.

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

## Quick answers

**Is CVE-2026-86561 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-86561 being exploited in the wild.

**How severe is CVE-2026-86561?** Medium severity, with a CVSS score of 6.5, published 14 October 2026.

**Which products and versions are affected?** DPDK DPDK.

**Is there a fix for CVE-2026-86561?** No fixed version is recorded yet. No mitigation is currently available; users should monitor for a patch release from the DPDK project.</anigation>
<parameter name="timeline">[{"kind": "disclosed", "at": "2026-10-14"}] 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-2026-86561 attacked?** It is attacked with local access.

**Am I affected by CVE-2026-86561?** Check whether you run DPDK. 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.

## How to fix


No mitigation is currently available; users should monitor for a patch release from the DPDK project.</anigation>
<parameter name="timeline">[{"kind": "disclosed", "at": "2026-10-14"}]

## Technical details

A missing memory size validation in DPDK lib/vhost prior to mmap during vhost memory-region setup allows a malicious guest that controls vhost-user memory table messages to trigger resource allocation without limits (CWE-770). The attacker requires local privileges to send crafted vhost-user messages and can trigger host denial of service through resource exhaustion or memory corruption. No fix is currently available.

## Affected products

- DPDK DPDK

## References

- [https://access.redhat.com/downloads/content/package-browser/](https://access.redhat.com/downloads/content/package-browser/)
- [https://access.redhat.com/security/cve/CVE-2026-86561](https://access.redhat.com/security/cve/CVE-2026-86561)

## 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)