{"id":"CVE-2026-98402","revision":"60acee55e9a549c19ce68fd600916344","records":[{"revision":"60acee55e9a549c19ce68fd600916344","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-98402","aliases":[],"title":"net: icmp: avoid invalid transport header access in icmp_send tracepoint","description":"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.","state":0,"publishedAt":"2026-10-14T13:26:02.321+00:00","modifiedAt":"2026-10-19T09:18:55.71+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"include/trace/events/icmp.h\"\n ],\n \"versions\": [\n {\n \"version\": \"524c341cb16a8d5318d2ffacf6fe160271a18743\",\n \"lessThan\": \"ec6d4612d1c170e1cef1fe55526471da1e81e777\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"21b28f97e621cba196fb32c576734d216a8a79c9\",\n \"lessThan\": \"99654b651c6d5fe865798a2adb859767905f9278\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"db3efdcf70c752e8a8deb16071d8e693c3ef8746\",\n \"lessThan\": \"b972b5e6168dc5d1e13297b1f37f71d6b21cc0f1\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"db3efdcf70c752e8a8deb16071d8e693c3ef8746\",\n \"lessThan\": \"04c0d35bac5122b533672a6775851dfae84e265e\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"db3efdcf70c752e8a8deb16071d8e693c3ef8746\",\n \"lessThan\": \"2b32f8c3560905582fb12ed68315a6e606367a6a\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"db3efdcf70c752e8a8deb16071d8e693c3ef8746\",\n \"lessThan\": \"7fcc2fe39fed1cb98a7374a113ff3800e8f9af80\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"6.1.130\",\n \"lessThan\": \"6.1.189\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.81\",\n \"lessThan\": \"6.6.158\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"include/trace/events/icmp.h\"\n ],\n \"versions\": [\n {\n \"version\": \"6.10\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"6.10\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.189\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.158\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.111\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.53\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.2.7\",\n \"lessThanOrEqual\": \"7.2.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.3\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/ec6d4612d1c170e1cef1fe55526471da1e81e777","https://git.kernel.org/stable/c/99654b651c6d5fe865798a2adb859767905f9278","https://git.kernel.org/stable/c/b972b5e6168dc5d1e13297b1f37f71d6b21cc0f1","https://git.kernel.org/stable/c/04c0d35bac5122b533672a6775851dfae84e265e","https://git.kernel.org/stable/c/2b32f8c3560905582fb12ed68315a6e606367a6a","https://git.kernel.org/stable/c/7fcc2fe39fed1cb98a7374a113ff3800e8f9af80"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-98402","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-98402","identifiers":["CVE-2026-98402"]},"retained":false,"historicalAffected":[]}],"coverage":[]}