Bug 2552437

Summary: CVE-2026-86846 grout: 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: groutAssignee: Robin Jarry <rjarry>
Status: ON_QA --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: rawhideCC: mruprich, rjarry
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["f0bef341-a463-4c9b-8c11-f186990b916f"]}
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: 2529846    

Description Ganesh 2026-10-14 16:00:38 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.
Comment 1 Fedora Update System 2026-10-15 11:22:11 UTC 
FEDORA-2026-804a8c08e3 (grout-0.19.3-1.fc45) has been submitted as an update to Fedora 45.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-804a8c08e3
Comment 2 Fedora Update System 2026-10-16 21:30:55 UTC 
FEDORA-2026-804a8c08e3 has been pushed to the Fedora 45 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-804a8c08e3`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-804a8c08e3

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.