{
  "cveId": "CVE-2026-98402",
  "url": "https://patchblox.com/security/cve/CVE-2026-98402",
  "summary": "CVE-2026-98402 is fixed in 38 products on 1 platform, first by DEBIAN-CVE-2026-98402, released October 16, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "net: icmp: avoid invalid transport header access in icmp_send tracepoint",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  net: icmp: avoid invalid transport header access in icmp_send tracepoint  syzbot reported a WARNING triggered by DEBUG_NET_WARN_ON_ONCE():   WARNING: at skb_transport_header include/linux/skbuff.h:3087 [inline]  WARNING: at udp_hdr include/linux/udp.h:23 [inline]  WARNING: at do_trace_event_raw_event_icmp_send include/trace/events/icmp.h:30 [inline]  WARNING: at trace_event_raw_event_icmp_send\u002B0x48c/0x6ec include/trace/events/icmp.h:11  Call trace:   skb_transport_header include/linux/skbuff.h:3087 [inline]   udp_hdr include/linux/udp.h:23 [inline]   do_trace_event_raw_event_icmp_send include/trace/events/icmp.h:30 [inline]   trace_event_raw_event_icmp_send\u002B0x48c/0x6ec include/trace/events/icmp.h:11   __traceiter_icmp_send include/trace/events/icmp.h:11 [inline]   __do_trace_icmp_send include/trace/events/icmp.h:11 [inline]   trace_icmp_send\u002B0x320/0x49c include/trace/events/icmp.h:11   __icmp_send\u002B0xcfc/0x11d8 net/ipv4/icmp.c:1013   ipv4_send_dest_unreach net/ipv4/route.c:1280 [inline]   ipv4_link_failure\u002B0x57c/0x8dc net/ipv4/route.c:1287   dst_link_failure include/net/dst.h:438 [inline]   vti_tunnel_xmit\u002B0xe40/0x17a4 net/ipv4/ip_vti.c:307  TP_fast_assign() unconditionally calls udp_hdr(skb) before checking whether the packet is UDP. Furthermore, __icmp_send() can be invoked from paths (e.g., link failures, ARP errors, forwarding, AF_PACKET) where skb-\u003Etransport_header was never initialized (~0U).  Under CONFIG_DEBUG_NET=y, calling skb_transport_header(skb) triggers DEBUG_NET_WARN_ON_ONCE(!skb_transport_header_was_set(skb)).  Fix this by: 1. Only parsing transport info when iph-\u003Eprotocol == IPPROTO_UDP. 2. Using skb_header_pointer() at skb_network_offset(skb) \u002B (iph-\u003Eihl \u003C\u003C 2)    to safely fetch the UDP header without assuming transport_header is set.",
  "published": "2026-10-12T09:00:00Z",
  "severity": "Low",
  "cvss": 3.7,
  "epss": 0.00211,
  "epssPercentile": 0.11446,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-98402",
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