{"schema":"threatline.record/2","record":{"id":"CVE-2026-98402","aliases":[],"summary":"net: icmp: avoid invalid transport header access in icmp_send tracepoint","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: icmp: avoid invalid transport header access in icmp_send tracepoint\n\nsyzbot reported a WARNING triggered by DEBUG_NET_WARN_ON_ONCE():\n\n WARNING: at skb_transport_header include/linux/skbuff.h:3087 [inline]\n WARNING: at udp_hdr include/linux/udp.h:23 [inline]\n WARNING: at do_trace_event_raw_event_icmp_send include/trace/events/icmp.h:30 [inline]\n WARNING: at trace_event_raw_event_icmp_send+0x48c/0x6ec include/trace/events/icmp.h:11\n Call trace:\n  skb_transport_header include/linux/skbuff.h:3087 [inline]\n  udp_hdr include/linux/udp.h:23 [inline]\n  do_trace_event_raw_event_icmp_send include/trace/events/icmp.h:30 [inline]\n  trace_event_raw_event_icmp_send+0x48c/0x6ec include/trace/events/icmp.h:11\n  __traceiter_icmp_send include/trace/events/icmp.h:11 [inline]\n  __do_trace_icmp_send include/trace/events/icmp.h:11 [inline]\n  trace_icmp_send+0x320/0x49c include/trace/events/icmp.h:11\n  __icmp_send+0xcfc/0x11d8 net/ipv4/icmp.c:1013\n  ipv4_send_dest_unreach net/ipv4/route.c:1280 [inline]\n  ipv4_link_failure+0x57c/0x8dc net/ipv4/route.c:1287\n  dst_link_failure include/net/dst.h:438 [inline]\n  vti_tunnel_xmit+0xe40/0x17a4 net/ipv4/ip_vti.c:307\n\nTP_fast_assign() unconditionally calls udp_hdr(skb) before checking\nwhether the packet is UDP. Furthermore, __icmp_send() can be invoked\nfrom paths (e.g., link failures, ARP errors, forwarding, AF_PACKET)\nwhere skb->transport_header was never initialized (~0U).\n\nUnder CONFIG_DEBUG_NET=y, calling skb_transport_header(skb) triggers\nDEBUG_NET_WARN_ON_ONCE(!skb_transport_header_was_set(skb)).\n\nFix this by:\n1. Only parsing transport info when iph->protocol == IPPROTO_UDP.\n2. Using skb_header_pointer() at skb_network_offset(skb) + (iph->ihl << 2)\n   to safely fetch the UDP header without assuming transport_header is set.","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98402","source_modified_at":"2026-10-19T09:18:55.710Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"524c341cb16a8d5318d2ffacf6fe160271a18743","lessThan":"ec6d4612d1c170e1cef1fe55526471da1e81e777","status":"affected","versionType":"git"},{"version":"21b28f97e621cba196fb32c576734d216a8a79c9","lessThan":"99654b651c6d5fe865798a2adb859767905f9278","status":"affected","versionType":"git"},{"version":"db3efdcf70c752e8a8deb16071d8e693c3ef8746","lessThan":"b972b5e6168dc5d1e13297b1f37f71d6b21cc0f1","status":"affected","versionType":"git"},{"version":"db3efdcf70c752e8a8deb16071d8e693c3ef8746","lessThan":"04c0d35bac5122b533672a6775851dfae84e265e","status":"affected","versionType":"git"},{"version":"db3efdcf70c752e8a8deb16071d8e693c3ef8746","lessThan":"2b32f8c3560905582fb12ed68315a6e606367a6a","status":"affected","versionType":"git"},{"version":"db3efdcf70c752e8a8deb16071d8e693c3ef8746","lessThan":"7fcc2fe39fed1cb98a7374a113ff3800e8f9af80","status":"affected","versionType":"git"},{"version":"6.1.130","lessThan":"6.1.189","status":"affected","versionType":"semver"},{"version":"6.6.81","lessThan":"6.6.158","status":"affected","versionType":"semver"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98402","source_modified_at":"2026-10-19T09:18:55.710Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"6.10","status":"affected"},{"version":"0","lessThan":"6.10","status":"unaffected","versionType":"semver"},{"version":"6.1.189","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.158","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.111","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.53","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.7","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}],"defaultStatus":"affected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98402","source_modified_at":"2026-10-19T09:18:55.710Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"99654b651c6d5fe865798a2adb859767905f9278","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98402","source_modified_at":"2026-10-19T09:18:55.710Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"04c0d35bac5122b533672a6775851dfae84e265e","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98402","source_modified_at":"2026-10-19T09:18:55.710Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"2b32f8c3560905582fb12ed68315a6e606367a6a","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98402","source_modified_at":"2026-10-19T09:18:55.710Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"7fcc2fe39fed1cb98a7374a113ff3800e8f9af80","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98402","source_modified_at":"2026-10-19T09:18:55.710Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"6.1.189","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98402","source_modified_at":"2026-10-19T09:18:55.710Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"6.6.158","basis":"first unaffected version stated in the CVE record"}],"cvss":null,"severity":null,"kev":{"listed":false},"epss":{"probability":0.00215,"percentile":0.11299,"score_date":"2026-10-23"},"published_at":"2026-10-14T13:26:02.321Z","modified_at":"2026-10-19T09:18:55.710Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-98402","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-19T09:18:55.710Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-98402","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://git.kernel.org/stable/c/ec6d4612d1c170e1cef1fe55526471da1e81e777"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/99654b651c6d5fe865798a2adb859767905f9278"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/b972b5e6168dc5d1e13297b1f37f71d6b21cc0f1"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/04c0d35bac5122b533672a6775851dfae84e265e"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/2b32f8c3560905582fb12ed68315a6e606367a6a"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/7fcc2fe39fed1cb98a7374a113ff3800e8f9af80"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-19T09:18:55.710Z","content_hash":"a76214018f3303ec67fc55b531493e0f0037766723f44fd7b009db27db128dcc"}}