CVE-2026-46037Network attack vector

Remote disclosure and crash via ICMP table lookup

Published May 27, 2026 · Updated May 27, 2026

Out-of-bounds access in Linux Kernel IPv4 ICMP handling allows remote attackers to disclose kernel data or crash hosts via probes. When forming an RFC 8335 extended echo reply, the ICMP_EXT_ECHOREPLY type exceeds NR_ICMP_TYPES, but the reply path still reads icmp_pointers at that index. The path is reachable without authentication only when net.ipv4.icmp_echo_enable_probe is enabled; its default is disabled, and a crafted request can expose memory or stop the host.

CVSS severity8.2
High
EPSS probability0.44%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds access in Linux Kernel IPv4 ICMP handling allows remote attackers to disclose kernel data or crash hosts via probes. When forming an RFC 8335 extended echo reply, the ICMP_EXT_ECHOREPLY type exceeds NR_ICMP_TYPES, but the reply path still reads icmp_pointers at that index. The path is reachable without authentication only when net.ipv4.icmp_echo_enable_probe is enabled; its default is disabled, and a crafted request can expose memory or stop the host.

The record

CVE
CVE-2026-46037
Published
May 27, 2026
Updated
May 27, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 27, 2026CVE publishedPublication date reported by the CVE source.
  2. May 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.13
  2. Affected versionversion=d329ea5bd8845f0b196bf41b18b6173340d6e0e4 <67bf002a2d7387a6312138210d0bd06e3cf4879b
  3. Affected versionversion=d329ea5bd8845f0b196bf41b18b6173340d6e0e4 <92e7c209036dcc0e8ffdf806fdfd3645b263bea5
  4. Affected versionversion=d329ea5bd8845f0b196bf41b18b6173340d6e0e4 <bc64a66e0b9ad937d3d49934242ee62b01ba9a94
  5. Affected versionversion=d329ea5bd8845f0b196bf41b18b6173340d6e0e4 <c2178ff1c70ebfc2ab9651b230c58a34683db759
  6. Affected versionversion=d329ea5bd8845f0b196bf41b18b6173340d6e0e4 <d700c34a5d186b9ba0715bcb19e0ff80ffbfbfc1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.13; version=d329ea5bd8845f0b196bf41b18b6173340d6e0e4 <67bf002a2d7387a6312138210d0bd06e3cf4879b; version=d329ea5bd8845f0b196bf41b18b6173340d6e0e4 <92e7c209036dcc0e8ffdf806fdfd3645b263bea5; version=d329ea5bd8845f0b196bf41b18b6173340d6e0e4 <bc64a66e0b9ad937d3d49934242ee62b01ba9a94; version=d329ea5bd8845f0b196bf41b18b6173340d6e0e4 <c2178ff1c70ebfc2ab9651b230c58a34683db759; version=d329ea5bd8845f0b196bf41b18b6173340d6e0e4 <d700c34a5d186b9ba0715bcb19e0ff80ffbfbfc1

Published CVSS scores

8.2Linux kernel CNACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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