CVE-2026-72249Network attack vector

Kernel memory corruption via wrong-direction IPIP route

Published Aug 15, 2026 · Updated Aug 15, 2026

Incorrect buffer sizing in Linux kernel 6.19 through 7.1.4 allows remote attackers to corrupt kernel memory via IPIP traffic. nf_flow_tunnel_ipip_push calculates headroom and fragmentation state from the opposite-direction route instead of the current dst. Reachability requires netfilter flowtable IPIP software acceleration; the bounded consequences are a kernel crash, code execution, or kernel-memory disclosure.

CVSS severity9.8
Critical
EPSS probability0.52%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Incorrect buffer sizing in Linux kernel 6.19 through 7.1.4 allows remote attackers to corrupt kernel memory via IPIP traffic. nf_flow_tunnel_ipip_push calculates headroom and fragmentation state from the opposite-direction route instead of the current dst. Reachability requires netfilter flowtable IPIP software acceleration; the bounded consequences are a kernel crash, code execution, or kernel-memory disclosure.

The record

CVE
CVE-2026-72249
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-131
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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=6.19
  2. Affected versionversion=d30301ba4b07ac92eb38353a111833b009003170 <c328b90c17fc5fa7786503695152880b2afb9326
  3. Affected versionversion=d30301ba4b07ac92eb38353a111833b009003170 <ecb78fbb03d3f86e2e93767875e273308086a424

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.19; version=d30301ba4b07ac92eb38353a111833b009003170 <c328b90c17fc5fa7786503695152880b2afb9326; version=d30301ba4b07ac92eb38353a111833b009003170 <ecb78fbb03d3f86e2e93767875e273308086a424

Published CVSS scores

7.0Red HatCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
9.8CVE.orgCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.7Amazon LinuxCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

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-131Incorrect Calculation of Buffer Size

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo