CVE-2026-72054

Cross-namespace tunnel rewrite via incomplete capability check

Published Aug 15, 2026 · Updated Aug 15, 2026

Authorization bypass in the Linux kernel allows local users to rewrite an IPsec VTI tunnel across network namespaces. vti_changelink() checks CAP_NET_ADMIN only in dev_net(dev), then parses link attributes that can modify a tunnel whose t->net points to another namespace. A caller needs local rtnetlink access and CAP_NET_ADMIN in the device namespace, but not in the tunnel namespace, enabling unauthorized tunnel reconfiguration.

CVSS severity8.8
High
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authorization bypass in the Linux kernel allows local users to rewrite an IPsec VTI tunnel across network namespaces. vti_changelink() checks CAP_NET_ADMIN only in dev_net(dev), then parses link attributes that can modify a tunnel whose t->net points to another namespace. A caller needs local rtnetlink access and CAP_NET_ADMIN in the device namespace, but not in the tunnel namespace, enabling unauthorized tunnel reconfiguration.

The record

CVE
CVE-2026-72054
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
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=3.15
  2. Affected versionversion=895de9a3488abcdd186680f0af3cce7f2d4d4a6e <1caf737e625143c6f23c32d2b747b1a3e42e5699
  3. Affected versionversion=895de9a3488abcdd186680f0af3cce7f2d4d4a6e <32edf8aa297745226854eda2d96c0fac66c1bb15
  4. Affected versionversion=895de9a3488abcdd186680f0af3cce7f2d4d4a6e <33fd93961557ec8e3e9958995b28684c5f949394
  5. Affected versionversion=895de9a3488abcdd186680f0af3cce7f2d4d4a6e <6d8bc0dc99472d62c57c2a3d436e6ab408592bda
  6. Affected versionversion=895de9a3488abcdd186680f0af3cce7f2d4d4a6e <88b33ee458a6ca5fbef6c53b9dba772da69dab68
  7. Affected versionversion=895de9a3488abcdd186680f0af3cce7f2d4d4a6e <9571af2eec8023af9a1671b7f2cd4ab400011724
  8. Affected versionversion=895de9a3488abcdd186680f0af3cce7f2d4d4a6e <95cceadbfd52d7239bd730afdda0655287d77425
  9. Affected versionversion=895de9a3488abcdd186680f0af3cce7f2d4d4a6e <973ead9e565423642e4533e1547b5d2c0476fb03

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.15; version=895de9a3488abcdd186680f0af3cce7f2d4d4a6e <1caf737e625143c6f23c32d2b747b1a3e42e5699; version=895de9a3488abcdd186680f0af3cce7f2d4d4a6e <32edf8aa297745226854eda2d96c0fac66c1bb15; version=895de9a3488abcdd186680f0af3cce7f2d4d4a6e <33fd93961557ec8e3e9958995b28684c5f949394; version=895de9a3488abcdd186680f0af3cce7f2d4d4a6e <6d8bc0dc99472d62c57c2a3d436e6ab408592bda; version=895de9a3488abcdd186680f0af3cce7f2d4d4a6e <88b33ee458a6ca5fbef6c53b9dba772da69dab68; version=895de9a3488abcdd186680f0af3cce7f2d4d4a6e <9571af2eec8023af9a1671b7f2cd4ab400011724; version=895de9a3488abcdd186680f0af3cce7f2d4d4a6e <95cceadbfd52d7239bd730afdda0655287d77425; version=895de9a3488abcdd186680f0af3cce7f2d4d4a6e <973ead9e565423642e4533e1547b5d2c0476fb03

Published CVSS scores

8.8kernel.orgCVSS:3.1/AV:L/AC:L/PR:L/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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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