Bug 2552434

Summary:	CVE-2026-86846 dpdk: dpdk: Guest can trigger out-of-bounds write by controlling avail ring index in vhost-crypto [fedora-all]
Product:	[Fedora] Fedora	Reporter:	Ganesh <gnaik>
Component:	dpdk	Assignee:	Timothy Redaelli <tredaelli>
Status:	NEW ---	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	rawhide	CC:	aconole, tredaelli
Target Milestone:	---	Keywords:	Security, SecurityTracking
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:	{"flaws": ["f0bef341-a463-4c9b-8c11-f186990b916f"]}
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Doc Text:		Story Points:	---
Clone Of:		Environment:
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Regression:	---	Mount Type:	---
Documentation:	---	CRM:
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	2529846

Description Ganesh 2026-10-14 15:59:15 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 vhost-crypto. rte_vhost_crypto_fetch_requests() uses a guest avail-ring descriptor index as a vring descriptor-table index without checking it against vq->size. vhost_crypto_finalize_one_request() then indexes the used ring by that guest descriptor index instead of the used-ring position, allowing an out-of-bounds write.