CVE-2026-9054Known exploitationNetwork attack vector

Kernel panic via undersized IP packets

Published May 22, 2026 · Updated May 22, 2026

Denial of service in the 9front kernel networking stack allows remote attackers to trigger a kernel panic with short IP packets. The udpiput, tcpiput, rdpiput, ilpullup, and greiput paths accept packets shorter than their required headers before trimblock processes the inconsistent lengths. No authentication or user interaction is required; a reachable host panics and interrupts service, with no reported data exposure or modification.

CVSS severity9.2
Critical
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in the 9front kernel networking stack allows remote attackers to trigger a kernel panic with short IP packets. The udpiput, tcpiput, rdpiput, ilpullup, and greiput paths accept packets shorter than their required headers before trimblock processes the inconsistent lengths. No authentication or user interaction is required; a reachable host panics and interrupts service, with no reported data exposure or modification.

The record

CVE
CVE-2026-9054
Published
May 22, 2026
Updated
May 22, 2026
Vendor
9front
Product
9front
Classifications
CWE-130, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 22, 2026CVE publishedPublication date reported by the CVE source.
  2. May 22, 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=863431cff8b47fa20625f4cbee3ea4e92367b152 <70c97c334171c715df82774d1a47638abaca2db4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

9front · 9frontversion=863431cff8b47fa20625f4cbee3ea4e92367b152 <70c97c334171c715df82774d1a47638abaca2db4

Published CVSS scores

9.29frontCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA: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 exploitationReported
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-130Improper Handling of Length Parameter Inconsistency
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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