CVE-2026-23459Network attack vector

Remote memory corruption and freezes via tunnel statistics

Published Apr 3, 2026 · Updated Apr 3, 2026

Improper per-CPU statistics handling in Linux Kernel 6.14 allows remote attackers to corrupt memory or freeze 32-bit systems via tunnel traffic. iptunnel_xmit_stats() treats VXLAN and Geneve devices as NETDEV_PCPU_STAT_TSTATS and writes the synchronization sequence at the wrong offset in pcpu_dstats. Exposure requires a 32-bit kernel and traffic through a VXLAN or Geneve transmit path; the bounded consequences are memory corruption and a system freeze.

CVSS severity8.2
High
EPSS probability0.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper per-CPU statistics handling in Linux Kernel 6.14 allows remote attackers to corrupt memory or freeze 32-bit systems via tunnel traffic. iptunnel_xmit_stats() treats VXLAN and Geneve devices as NETDEV_PCPU_STAT_TSTATS and writes the synchronization sequence at the wrong offset in pcpu_dstats. Exposure requires a 32-bit kernel and traffic through a VXLAN or Geneve transmit path; the bounded consequences are memory corruption and a system freeze.

The record

CVE
CVE-2026-23459
Published
Apr 3, 2026
Updated
Apr 3, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 3, 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=6.14
  2. Affected versionversion=be226352e8dc77d3313c096b2d8e7f69bf6980fc <0d087d00161f562d5047cc4009bb0c6a19daf9f1
  3. Affected versionversion=be226352e8dc77d3313c096b2d8e7f69bf6980fc <8431c602f551549f082bbfa67f3003f2d8e3e132

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.14; version=be226352e8dc77d3313c096b2d8e7f69bf6980fc <0d087d00161f562d5047cc4009bb0c6a19daf9f1; version=be226352e8dc77d3313c096b2d8e7f69bf6980fc <8431c602f551549f082bbfa67f3003f2d8e3e132

Published CVSS scores

8.2kernel.orgCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/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

T1499Endpoint Denial of Service

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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