net: icmp: avoid invalid transport header access in icmp_send tracepoint

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-98402
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-14 14:17:51 UTC
Updated2026-10-19 10:18:45 UTC
DescriptionIn 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+0x48c/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+0x48c/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+0x320/0x49c include/trace/events/icmp.h:11 __icmp_send+0xcfc/0x11d8 net/ipv4/icmp.c:1013 ipv4_send_dest_unreach net/ipv4/route.c:1280 [inline] ipv4_link_failure+0x57c/0x8dc net/ipv4/route.c:1287 dst_link_failure include/net/dst.h:438 [inline] vti_tunnel_xmit+0xe40/0x17a4 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->transport_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->protocol == IPPROTO_UDP. 2. Using skb_header_pointer() at skb_network_offset(skb) + (iph->ihl << 2) to safely fetch the UDP header without assuming transport_header is set.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 524c341cb16a8d5318d2ffacf6fe160271a18743 ec6d4612d1c170e1cef1fe55526471da1e81e777 git Not specified
CNA Linux Linux affected 21b28f97e621cba196fb32c576734d216a8a79c9 99654b651c6d5fe865798a2adb859767905f9278 git Not specified
CNA Linux Linux affected db3efdcf70c752e8a8deb16071d8e693c3ef8746 b972b5e6168dc5d1e13297b1f37f71d6b21cc0f1 git Not specified
CNA Linux Linux affected db3efdcf70c752e8a8deb16071d8e693c3ef8746 04c0d35bac5122b533672a6775851dfae84e265e git Not specified
CNA Linux Linux affected db3efdcf70c752e8a8deb16071d8e693c3ef8746 2b32f8c3560905582fb12ed68315a6e606367a6a git Not specified
CNA Linux Linux affected db3efdcf70c752e8a8deb16071d8e693c3ef8746 7fcc2fe39fed1cb98a7374a113ff3800e8f9af80 git Not specified
CNA Linux Linux affected 6.1.130 6.1.189 semver Not specified
CNA Linux Linux affected 6.6.81 6.6.158 semver Not specified
CNA Linux Linux affected 6.10 Not specified
CNA Linux Linux unaffected 6.10 semver Not specified
CNA Linux Linux unaffected 6.1.189 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.158 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.111 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.53 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.7 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/2b32f8c3560905582fb12ed68315a6e606367a6a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/04c0d35bac5122b533672a6775851dfae84e265e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/99654b651c6d5fe865798a2adb859767905f9278 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b972b5e6168dc5d1e13297b1f37f71d6b21cc0f1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ec6d4612d1c170e1cef1fe55526471da1e81e777 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7fcc2fe39fed1cb98a7374a113ff3800e8f9af80 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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