CVE-2026-86566CWE-191

CVE-2026-86566

Medium · published October 14, 2026

CVSS v3.1
6.5
EPSS
0%
Percentile
2.4
In the wild
Unconfirmed
What it is

A flaw was found in DPDK lib/vhost. A guest with runt RX descriptors can underflow the copy length in vhost enqueue, causing a denial of service in a shared vhost backend such as OVS-DPDK.

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00130 · 2.4th percentile
Weakness
CWE-191 · Integer Underflow (Wrap or Wraparound)
Published
2026-10-14T22:19Z
References (2)
https://access.redhat.com/security/cve/CVE-2026-86566 · [email protected]https://bugzilla.redhat.com/show_bug.cgi?id=2529684 · [email protected]
EPSS history
Timeline
  • 16 OCT 03:33Z
    EPSS moved — → 0%
    epss
  • 14 OCT 17:52Z
    Dpdk: dpdk: guest with runt rx descriptors underflows copy length in vhost enqueue (split and packed rings)
    cvelistv5
  • 14 OCT 17:52Z
    Dpdk: dpdk: guest with runt rx descriptors underflows copy length in vhost enqueue (split and packed rings)
    cvelistv5