Denial of Service Vulnerability in DPDK's vhost Integration with OVS
CVE-2026-86566

6.5MEDIUM

Key Information:

Vendor

Red Hat
Status
Fast Datapath For Rhel 10
Fast Datapath For Rhel 8
Fast Datapath For Rhel 9
Red Hat Enterprise Linux 10
Vendor
CVE Published:
14 October 2026

What is CVE-2026-86566?

A flaw has been identified in DPDK's vhost integration that can lead to a denial of service. When a guest machine utilizes runt RX descriptors, it can cause an underflow in the copy length during the vhost enqueue process. This vulnerability poses a risk in shared vhost backends, such as Open vSwitch (OVS) with DPDK, making it possible for an attacker to disrupt the normal operation of the system.

References

https://access.redhat.com/security/cve/CVE-2026-86566
vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2529684
issue-trackingx_refsource_REDHAT

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Red Hat would like to thank Anthropic Research and Arthur Chan (Ada Logics) for reporting this issue.
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