Bug 2420872 (CVE-2025-67499)

Summary: CVE-2025-67499 CNI portmap plugin: github.com/containernetworking/plugins/plugins/meta/portmap: CNI portmap plugin: HostPort forwarding vulnerability allows traffic interception
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: dfreiber, drow, fdeutsch, jburrell, oramraz, smullick, stirabos, thason, vkumar
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the CNI (Container Network Interface) portmap plugin. This vulnerability allows containers to intercept all traffic destined for a host port via inadvertent forwarding of traffic with the same destination port when the plugin is configured with the nftables backend, ignoring the destination IP.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2423122, 2423123    
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Description OSIDB Bzimport 2025-12-10 00:01:49 UTC 
The CNI portmap plugin allows containers to emulate opening a host port, forwarding that traffic to the container. Versions 1.6.0 through 1.8.0  inadvertently forward all traffic with the same destination port as the host port when the portmap plugin is configured with the nftables backend, thus ignoring the destination IP. This includes traffic not intended for the node itself, i.e. traffic to containers hosted on the node. Containers that request HostPort forwarding can intercept all traffic destined for that port. This requires that the portmap plugin be explicitly configured to use the nftables backend. This issue is fixed in version 1.9.0. To workaround, configure the portmap plugin to use the iptables backend. It does not have this vulnerability.