CVE-2026-68142

Cross-namespace configuration changes via incomplete capability check

Published Aug 10, 2026 · Updated Aug 10, 2026

Improper privilege assignment in Linux kernel Geneve tunnels allows local users to rewrite device settings across network namespaces. geneve_changelink() proceeds after rtnl checks CAP_NET_ADMIN only in dev_net(dev), then applies configuration and reopens sockets in geneve->net. The caller needs CAP_NET_ADMIN in the device namespace but not the underlay namespace, enabling unauthorized network changes or a service interrupt.

CVSS severity7.0
High
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper privilege assignment in Linux kernel Geneve tunnels allows local users to rewrite device settings across network namespaces. geneve_changelink() proceeds after rtnl checks CAP_NET_ADMIN only in dev_net(dev), then applies configuration and reopens sockets in geneve->net. The caller needs CAP_NET_ADMIN in the device namespace but not the underlay namespace, enabling unauthorized network changes or a service interrupt.

The record

CVE
CVE-2026-68142
Published
Aug 10, 2026
Updated
Aug 10, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-266, T1548
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 10, 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=4.14
  2. Affected versionversion=5b861f6baa3a22a48d7a4ad0ce38a223d36c978a <2abdacc927c92fa6a9cc8341e8c9b88dcb561553
  3. Affected versionversion=5b861f6baa3a22a48d7a4ad0ce38a223d36c978a <8efb8f8bbb353b8f2fdf4f37534c6d96c9f69e01
  4. Affected versionversion=5b861f6baa3a22a48d7a4ad0ce38a223d36c978a <95f45e20f1b2cec13823f0f68060ab4b2261b2c1
  5. Affected versionversion=5b861f6baa3a22a48d7a4ad0ce38a223d36c978a <9de5518fc1fab583526a8f66b8e505c4864dc60a
  6. Affected versionversion=5b861f6baa3a22a48d7a4ad0ce38a223d36c978a <f8c498585d2a08aa623748353c3e61467b7e9fd2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.14; version=5b861f6baa3a22a48d7a4ad0ce38a223d36c978a <2abdacc927c92fa6a9cc8341e8c9b88dcb561553; version=5b861f6baa3a22a48d7a4ad0ce38a223d36c978a <8efb8f8bbb353b8f2fdf4f37534c6d96c9f69e01; version=5b861f6baa3a22a48d7a4ad0ce38a223d36c978a <95f45e20f1b2cec13823f0f68060ab4b2261b2c1; version=5b861f6baa3a22a48d7a4ad0ce38a223d36c978a <9de5518fc1fab583526a8f66b8e505c4864dc60a; version=5b861f6baa3a22a48d7a4ad0ce38a223d36c978a <f8c498585d2a08aa623748353c3e61467b7e9fd2

Published CVSS scores

7.0Red HatCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
8.8cve.orgCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
7.0Oracle LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
4.4Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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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-266Incorrect Privilege Assignment
T1548Abuse Elevation Control Mechanism

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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