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

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Linux 内核中，以下漏洞已得到修复： 网络（net）：icmp：避免在 icmp_send 跟踪点（tracepoint）中访问无效的传输层头部 syzbot 报告由 触发的警告： TP_fast_assign() 宏在检查数据包是否为 UDP 协议之前，无条件调用了 。此外， 可能被从某些路径（例如链路故障、ARP 错误、转发、AF_PACKET 等）调用，在这些路径中， 从未被初始化（其值为 ）。 当启用 时，调用 会触发 。 修复方法如下： 1. 仅在 时才解析传输层信息。 2. 使用 ，结合 偏移量

AI Predicted 3.7 Difficulty: Theoretical EPSS 0.21% · P11

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux 524c341cb16a8d5318d2ffacf6fe160271a18743< ec6d4612d1c170e1cef1fe55526471da1e81e777 affected
21b28f97e621cba196fb32c576734d216a8a79c9< 99654b651c6d5fe865798a2adb859767905f9278 affected
db3efdcf70c752e8a8deb16071d8e693c3ef8746< b972b5e6168dc5d1e13297b1f37f71d6b21cc0f1 affected
db3efdcf70c752e8a8deb16071d8e693c3ef8746< 04c0d35bac5122b533672a6775851dfae84e265e affected
db3efdcf70c752e8a8deb16071d8e693c3ef8746< 2b32f8c3560905582fb12ed68315a6e606367a6a affected
db3efdcf70c752e8a8deb16071d8e693c3ef8746< 7fcc2fe39fed1cb98a7374a113ff3800e8f9af80 affected
6.1.130< 6.1.189 affected
6.6.81< 6.6.158 affected
… +8 more rows
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I. Basic Information for CVE-2026-98402

Vulnerability Information
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Vulnerability Title
net: icmp: avoid invalid transport header access in icmp_send tracepoint
Source: CVE Program / CVE List V5
Vulnerability 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+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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 524c341cb16a8d5318d2ffacf6fe160271a18743 ~ ec6d4612d1c170e1cef1fe55526471da1e81e777 -
Linux Linux 6.10 -

II. Public POCs for CVE-2026-98402

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III. Intelligence Information for CVE-2026-98402

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Other References for CVE-2026-98402 (5)

Same Patch Batch · Linux · 2026-10-14 · 46 CVEs total

CVE-2026-98398 locking/lockdep: Invalidate stale class_cache entries for zapped classes
CVE-2026-98396 powerpc: Do not restore KUAP in arch_exit_to_user_mode_prepare()
CVE-2026-98393 net: ipv4: Fix UDP length overflow with PMTU discover and big MTU
CVE-2026-98391 drm/xe: Guard page-fault worker with runtime PM check
CVE-2026-98389 drm/amdgpu: skip gfx switch_power_profile during GPU reset
CVE-2026-98388 exec: do_close_on_exec() before taking exec_update_lock
CVE-2026-98387 s390/crypto: Fix skcipher_walk return code handling in aes_s390
CVE-2026-98386 scsi: qla2xxx: Use memset_io() to clear QLAFX00 request ring slot
CVE-2026-98390 x86/amd_node: Avoid divide by zero on virtualized systems
CVE-2026-98397 platform/x86: x86-android-tablets: hold device reference for secondary fwnode teardown
CVE-2026-98395 powerpc/entry: Fix irq_soft_mask corruption on replayed interrupt exit
CVE-2026-98399 s390/ipl: Fix NULL deref in dump_reipl without re-IPL parm block
CVE-2026-98400 s390/ipl: Fix NULL deref in kdump without re-IPL parm block
CVE-2026-98401 net: iptunnel: fix stale transport header during tunnel decapsulation
CVE-2026-98403 s390/boot: Avoid IPL parameter append past command line
CVE-2026-98404 drm/virtio: Fix a NULL vs ERR_PTR() bug in virtio_gpu_user_framebuffer_create()
CVE-2026-98405 smb: client: fix missing iov bounds check in parse_posix_sids()
CVE-2026-98406 wifi: mac80211: avoid WARN in set_bitrate_mask when sdata not in driver
CVE-2026-98408 watchdog: rzv2h: Avoid division by zero
CVE-2026-98407 wifi: rsi: fix heap OOB write on key removal

Showing top 20 of 46 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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