CVE-2025-68363 bpf: Check skb->transport_header is set in bpf_skb_check_mtu

In the Linux kernel, the following vulnerability has been resolved: bpf: Check skb-transportheader is set in bpfskbcheckmtu The bpfskbcheckmtu helper needs to use skb-transportheader when the BPFMTUCHKSEGS flag is used: bpfskbcheckmtuskb, ifindex, &mtulen, 0, BPFMTUCHKSEGS The transportheader is...

CVE-2025-68363

CVE-2025-68363 : Linux kernel BPF MTU check bug. The helper bpf_skb_check_mtu used skb->transport_header without guaranteeing that skb_transport_header was set, causing a WARN_ON_ONCE during BPF test_run. The fix adds a guard using skb_transport_header_was_set() and performs the check just bef...