CVE-2026-86566: Integer Underflow (Wrap or Wraparound) in Red Hat Fast Datapath for RHEL 10
Description
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.
CVSS v3.1
Score 6.5medium
Affected software
Red Hat
Fast Datapath for RHEL 10
Red Hat
Fast Datapath for RHEL 8
Red Hat
Fast Datapath for RHEL 9
Red Hat
Red Hat Enterprise Linux 10
Red Hat
Red Hat Enterprise Linux 8
Red Hat
Red Hat Enterprise Linux 9
Red Hat
Red Hat OpenShift Container Platform 4
Red Hat
Red Hat OpenStack Platform 13 (Queens)
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability involves an integer underflow (wrap or wraparound) in the DPDK lib/vhost component used by Red Hat Fast Datapath for RHEL 10. When a guest sends runt RX descriptors, the copy length used in the vhost enqueue function can underflow, causing a denial of service condition in shared vhost backends like OVS-DPDK. The issue is classified as a medium severity denial of service vulnerability with no confidentiality or integrity impact. The vendor advisory URL is provided but does not include explicit patch or remediation details in the input data.
Potential Impact
The vulnerability allows a denial of service (DoS) in shared vhost backends such as OVS-DPDK by causing an integer underflow in the copy length during vhost enqueue operations. There is no impact on confidentiality or integrity. The DoS could disrupt network packet processing in affected environments.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory at https://access.redhat.com/security/cve/CVE-2026-86566 for current remediation guidance. No explicit patch or workaround information is provided in the available data.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- redhat
- Date Reserved
- 2026-09-08T02:56:43.567Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Vendor Advisory Urls
- [{"url":"https://access.redhat.com/security/cve/CVE-2026-86566","vendor":"Red Hat"}]
Threat ID: 6acfc4752cdf04f6569de057
Added to database: 10/14/2026, 18:05:41 UTC
Last enriched: 10/14/2026, 18:19:07 UTC
Last updated: 10/14/2026, 20:04:11 UTC
Views: 9
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