Quick answers
- Is CVE-2026-86566 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-86566 being exploited in the wild.
- How severe is CVE-2026-86566?
- 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-2026-86566?
- 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-2026-86566 attacked?
- It is attacked with local access.
- Am I affected by CVE-2026-86566?
- 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.
Technical details
An integer underflow (CWE-191) exists in lib/vhost's RX descriptor enqueue path when processing runt (undersized) descriptors. A local attacker with guest VM access can supply malformed RX descriptors in split or packed ring formats to trigger the underflow, leading to memory corruption and crash of the vhost backend process. The attack requires low-privilege guest access and no user interaction; it affects the integrity and availability of the shared vhost backend.
Affected products
- DPDK DPDK
Timeline
- 2026-10-14: disclosed