CVE-2026-72419

System crash via stale netfilter NAT pointer

Published Aug 15, 2026 · Updated Aug 15, 2026

Type confusion in affected Linux kernel revisions allows local users to crash the system through netfilter NAT chain creation. If built-in nf_nat initialization fails while registering BPF kfuncs, its released per-network ID can be reused, but nf_nat_register_fn still passes the stale ID to net_generic and accesses another structure as nat_net. The path requires built-in nf_nat, the initialization failure, and a later dependent NAT-hook registration; the resulting invalid access can corrupt memory or stop the system.

CVSS severity7.8
High
EPSS probability0.16%
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 affected Linux kernel revisions allows local users to crash the system through netfilter NAT chain creation. If built-in nf_nat initialization fails while registering BPF kfuncs, its released per-network ID can be reused, but nf_nat_register_fn still passes the stale ID to net_generic and accesses another structure as nat_net. The path requires built-in nf_nat, the initialization failure, and a later dependent NAT-hook registration; the resulting invalid access can corrupt memory or stop the system.

The record

CVE
CVE-2026-72419
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-125, T1499.004
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=6.1
  2. Affected versionversion=cbc1dd5b659f5a2c3cba88b197b7443679bb35a0 <069cfe3de2a5e16069485893cd04665ab769c1d8
  3. Affected versionversion=cbc1dd5b659f5a2c3cba88b197b7443679bb35a0 <359d8ff97362a4662356104540e4814bff9dad7c
  4. Affected versionversion=cbc1dd5b659f5a2c3cba88b197b7443679bb35a0 <87f7a720de2545fdac29c85acb7163676feacdaf
  5. Affected versionversion=cbc1dd5b659f5a2c3cba88b197b7443679bb35a0 <a73e7ac3f3b69e9581ec7bfd889ff3e9b8c773f7
  6. Affected versionversion=cbc1dd5b659f5a2c3cba88b197b7443679bb35a0 <e794f633021defcfa98e17d73b955cd07590831f
  7. Affected versionversion=cbc1dd5b659f5a2c3cba88b197b7443679bb35a0 <eb14aba91163c33d8c99f9d7c06690e08b56a250

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.1; version=cbc1dd5b659f5a2c3cba88b197b7443679bb35a0 <069cfe3de2a5e16069485893cd04665ab769c1d8; version=cbc1dd5b659f5a2c3cba88b197b7443679bb35a0 <359d8ff97362a4662356104540e4814bff9dad7c; version=cbc1dd5b659f5a2c3cba88b197b7443679bb35a0 <87f7a720de2545fdac29c85acb7163676feacdaf; version=cbc1dd5b659f5a2c3cba88b197b7443679bb35a0 <a73e7ac3f3b69e9581ec7bfd889ff3e9b8c773f7; version=cbc1dd5b659f5a2c3cba88b197b7443679bb35a0 <e794f633021defcfa98e17d73b955cd07590831f; version=cbc1dd5b659f5a2c3cba88b197b7443679bb35a0 <eb14aba91163c33d8c99f9d7c06690e08b56a250

Published CVSS scores

7.0Red HatCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
5.3Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:H
7.0Oracle LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
5.3SUSECVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:H
7.8Linux Kernel CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8UbuntuCVSS:3.1/AV:L/AC:L/PR:L/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-125Out-of-bounds Read
T1499.004Application or System Exploitation

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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