CVE-2026-72408Network attack vector

Host compromise via unchecked Geneve GRO hint

Published Aug 15, 2026 · Updated Aug 15, 2026

Out-of-bounds access in the Geneve GRO path in Linux 7.0 allows remote attackers to crash hosts via crafted tunnel packets. geneve_gro_complete() accepts an attacker-controlled GRO hint that geneve_gro_receive() ignored, inflates the header offset, and dispatches an inner completion handler beyond validated packet data. The packet must reach a UDP Geneve tunnel without IFLA_GENEVE_GRO_HINT enabled; the mismatch permits kernel memory disclosure or modification and a kernel panic or hang.

CVSS severity10.0
Critical
EPSS probability0.38%
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 the Geneve GRO path in Linux 7.0 allows remote attackers to crash hosts via crafted tunnel packets. geneve_gro_complete() accepts an attacker-controlled GRO hint that geneve_gro_receive() ignored, inflates the header offset, and dispatches an inner completion handler beyond validated packet data. The packet must reach a UDP Geneve tunnel without IFLA_GENEVE_GRO_HINT enabled; the mismatch permits kernel memory disclosure or modification and a kernel panic or hang.

The record

CVE
CVE-2026-72408
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-125, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 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=7.0
  2. Affected versionversion=fd0dd796576e1a560e1441e665810129f0a82be0 <2651c174445884ac9e85622aeade9c1f7b98d8e5
  3. Affected versionversion=fd0dd796576e1a560e1441e665810129f0a82be0 <49c2e7c0a69999a75ef5eaebe1559a20d0b3c15a

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=7.0; version=fd0dd796576e1a560e1441e665810129f0a82be0 <2651c174445884ac9e85622aeade9c1f7b98d8e5; version=fd0dd796576e1a560e1441e665810129f0a82be0 <49c2e7c0a69999a75ef5eaebe1559a20d0b3c15a

Published CVSS scores

10.0LinuxCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/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-125Out-of-bounds Read
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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