CVE-2026-46039Network attack vector

Oversized ticket acceptance via length-check overflow

Published May 27, 2026 · Updated May 27, 2026

Integer overflow in the Linux Kernel RXGK parser allows remote attackers to bypass ticket-length validation during an unauthenticated UDP handshake. rxgk_extract_token() rounds an untrusted 32-bit ticket length upward before comparing it with available token data, allowing the value to wrap and pass the short-packet check. The in-kernel RXGK server must process the crafted handshake; published material identifies no resulting crash, disclosure, write, or code execution.

CVSS severity9.8
Critical
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

Integer overflow in the Linux Kernel RXGK parser allows remote attackers to bypass ticket-length validation during an unauthenticated UDP handshake. rxgk_extract_token() rounds an untrusted 32-bit ticket length upward before comparing it with available token data, allowing the value to wrap and pass the short-packet check. The in-kernel RXGK server must process the crafted handshake; published material identifies no resulting crash, disclosure, write, or code execution.

The record

CVE
CVE-2026-46039
Published
May 27, 2026
Updated
May 27, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-190, 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=2429a197648178cd4dc930a9d87c13c547460564 <183d37f12d1c8ed24a5bfc7addad05510da22a94
  2. Affected versionversion=2429a197648178cd4dc930a9d87c13c547460564 <43222ac484f93b3ec2d240a7575e1cedd31f5fa4
  3. Affected versionversion=2429a197648178cd4dc930a9d87c13c547460564 <6929350080f4da292d111a3b33e53138fee51cec
  4. Affected versionversion=6.16.9 <6.17
  5. Affected versionversion=6.17
  6. Affected versionversion=71571e187106631a8127f2dde780f35caa358d33

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=2429a197648178cd4dc930a9d87c13c547460564 <183d37f12d1c8ed24a5bfc7addad05510da22a94; version=2429a197648178cd4dc930a9d87c13c547460564 <43222ac484f93b3ec2d240a7575e1cedd31f5fa4; version=2429a197648178cd4dc930a9d87c13c547460564 <6929350080f4da292d111a3b33e53138fee51cec; version=6.16.9 <6.17; version=6.17; version=71571e187106631a8127f2dde780f35caa358d33

Published CVSS scores

9.8kernel.orgCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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

CWE-190Integer Overflow or Wraparound
T1190Exploit Public-Facing Application

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.

Technologies

Your stack

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Your stack

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