Not yet scoredPublished Oct 14, 2026

CVE-2026-98402net: icmp: avoid invalid transport header access in icmp_send tracepoint

Updated under an hour ago (Oct 27, 2026, 6:50 AM ET)

Does this affect you?

It affects Linux. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for Linux

Exploited in the last 30 days

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+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.

CVSS: Not yet scored
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Received
Record last updated: Oct 19, 2026
First seen by InfoSec Signals: Oct 14, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 524c341cb16a8d5318d2ffacf6fe160271a18743 before ec6d4612d1c170e1cef1fe55526471da1e81e777; from 21b28f97e621cba196fb32c576734d216a8a79c9 before 99654b651c6d5fe865798a2adb859767905f9278; from db3efdcf70c752e8a8deb16071d8e693c3ef8746 before b972b5e6168dc5d1e13297b1f37f71d6b21cc0f1; from db3efdcf70c752e8a8deb16071d8e693c3ef8746 before 04c0d35bac5122b533672a6775851dfae84e265e; from db3efdcf70c752e8a8deb16071d8e693c3ef8746 before 2b32f8c3560905582fb12ed68315a6e606367a6a; from db3efdcf70c752e8a8deb16071d8e693c3ef8746 before 7fcc2fe39fed1cb98a7374a113ff3800e8f9af80; from 6.1.130 before 6.1.189; from 6.6.81 before 6.6.158	CNA record

References

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.