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CVE-2022-48936 was rejected or withdrawn by its CVE Numbering Authority in August 2024. The associated Linux kernel defect affected Generic Segmentation Offload handling of IP-in-IP traffic transmitted through net_failover. In a path where GRO-processed host traffic reaches a VM through virtio_net and net_failover, is processed by IPVS full NAT, encapsulated with IPIP, and transmitted again through net_failover, the packet network-header pointer could reference the inner IP header rather than the outer encapsulation header. For packets marked with TCPv4, DODGY, and IP-in-IP GSO attributes, net_failover does not segment the packet because it supports the relevant offloads, leaving the incorrect header reference and causing TCP packet drops.
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Linux kernel vulnerability addressed by this kernel-rt update; no issue description is provided in the content.
Linux kernel GSO handling flaw for IP-in-IP and net_failover traffic.
Linux kernel GSO outer IP-header processing flaw for IPIP and net_failover.
A Linux kernel GSO/net_failover handling flaw affecting IP-in-IP encapsulated traffic. Under the described host-to-VM path involving virtio_net, net_failover, IPVS full NAT, and IPIP encapsulation, the network header can incorrectly point to the inner rather than outer IP header, resulting in TCP packet drops. The CVE was subsequently rejected upstream.
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