CVE-2026-72429

Kernel crash via IPv6 IOAM type confusion

Published Aug 15, 2026 · Updated Aug 15, 2026

Type confusion in Linux 6.16 IPv6 IOAM allows local users to crash the kernel through an invalid pointer access. rt6_get_cookie() treats ioam6_lwt.null_dst, embedded only as dst_entry, as a full rt6_info and reads aliased fields from the wrong object. Reachability requires IPv6 IOAM lightweight-tunnel state and reset_ts becoming zero; the resulting per-CPU dereference can crash the host.

CVSS severity9.8
Critical
EPSS probability0.60%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Type confusion in Linux 6.16 IPv6 IOAM allows local users to crash the kernel through an invalid pointer access. rt6_get_cookie() treats ioam6_lwt.null_dst, embedded only as dst_entry, as a full rt6_info and reads aliased fields from the wrong object. Reachability requires IPv6 IOAM lightweight-tunnel state and reset_ts becoming zero; the resulting per-CPU dereference can crash the host.

The record

CVE
CVE-2026-72429
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-843, T1499
Attack vector
local
Privileges
authenticated

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=47ce7c854563fe8450e9cb8dcd62c6470e28076b <5a3b2ee1e96d0580a8ed8deda6dfa430604f9ab0
  2. Affected versionversion=47ce7c854563fe8450e9cb8dcd62c6470e28076b <9ed19e11d2146076d117d51a940643990118449b
  3. Affected versionversion=47ce7c854563fe8450e9cb8dcd62c6470e28076b <ea24f911ead85ba3d570a31e37c52b6c949f6928
  4. Affected versionversion=6.16

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=47ce7c854563fe8450e9cb8dcd62c6470e28076b <5a3b2ee1e96d0580a8ed8deda6dfa430604f9ab0; version=47ce7c854563fe8450e9cb8dcd62c6470e28076b <9ed19e11d2146076d117d51a940643990118449b; version=47ce7c854563fe8450e9cb8dcd62c6470e28076b <ea24f911ead85ba3d570a31e37c52b6c949f6928; version=6.16

Published CVSS scores

5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
9.8cve.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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-843Access of Resource Using Incompatible Type ('Type Confusion')
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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