{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-98402", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.347Z", "datePublished": "2026-10-14T13:26:02.321Z", "dateUpdated": "2026-10-19T09:18:55.710Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T09:18:55.710Z" }, "descriptions": [ { "lang": "en", "value": "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." } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "include/trace/events/icmp.h" ], "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" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "include/trace/events/icmp.h" ], "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" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1.130", "versionEndExcluding": "6.1.189" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6.81", "versionEndExcluding": "6.6.158" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.10", "versionEndExcluding": "6.12.111" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.10", "versionEndExcluding": "6.18.53" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.10", "versionEndExcluding": "7.2.7" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.10", "versionEndExcluding": "7.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/ec6d4612d1c170e1cef1fe55526471da1e81e777" }, { "url": "https://git.kernel.org/stable/c/99654b651c6d5fe865798a2adb859767905f9278" }, { "url": "https://git.kernel.org/stable/c/b972b5e6168dc5d1e13297b1f37f71d6b21cc0f1" }, { "url": "https://git.kernel.org/stable/c/04c0d35bac5122b533672a6775851dfae84e265e" }, { "url": "https://git.kernel.org/stable/c/2b32f8c3560905582fb12ed68315a6e606367a6a" }, { "url": "https://git.kernel.org/stable/c/7fcc2fe39fed1cb98a7374a113ff3800e8f9af80" } ], "title": "net: icmp: avoid invalid transport header access in icmp_send tracepoint", "x_generator": { "engine": "bippy-1.2.0" } } } }