Bug 2552376

Summary: CVE-2026-100236 grout: dpdk: heap out-of-bounds read/write in GSO header copy [fedora-all]
Product: [Fedora] Fedora Reporter: Ganesh <gnaik>
Component: groutAssignee: Robin Jarry <rjarry>
Status: ON_QA --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: rawhideCC: mruprich, rjarry
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["da255636-e2db-4f40-8707-5aa5d09a70e0"]}
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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: 2541488    

Description Ganesh 2026-10-14 15:14:41 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/gso. hdr_segment_init() copies pkt_hdr_offset bytes from the first mbuf segment into a newly allocated header mbuf using rte_memcpy without checking that the source first segment is long enough or that the destination mbuf has enough tailroom. pkt_hdr_offset is taken from mbuf l2/l3/l4 (and outer) length fields, which applications commonly populate from packet headers including IP IHL and TCP data offset. A related uint16_t subtraction (gso_size - hdr_offset) underflows when the header is larger than gso_size. An application that runs software GSO on packets from an untrusted source (for example a guest via vhost, or scatter RX) can therefore read or write past mbuf bounds.
Comment 1 Fedora Update System 2026-10-15 11:21:43 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 21:30:33 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.