Bug 2552424

Summary: CVE-2026-86566 dpdk: dpdk: Guest with runt RX descriptors underflows copy length in vhost enqueue (split and packed rings) [fedora-all]
Product: [Fedora] Fedora Reporter: Ganesh <gnaik>
Component: dpdkAssignee: Timothy Redaelli <tredaelli>
Status: NEW --- QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: medium Docs Contact:
Priority: medium    
Version: rawhideCC: aconole, tredaelli
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["6e65fe85-ec74-431e-816a-6839e6f12e08"]}
Fixed In Version: Doc Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Bug Depends On:    
Bug Blocks: 2529684    

Description Ganesh 2026-10-14 15:53:19 UTC 
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

A flaw was found in DPDK lib/vhost. Runt RX descriptors underflow the copy length in vhost enqueue on both split and packed rings. Unsigned subtraction underflow allows a full packet copy past a tiny descriptor window, which can crash a host vswitch such as OVS-DPDK.