CVE-2025-68340

System hang via premature team device type change

Published Dec 23, 2025 · Updated Dec 23, 2025

Denial of service in the Linux kernel team driver allows local users to hang the system through crafted team and GRE device setup. team_port_add calls team_dev_type_check_change before later validation, so a rejected active GRE port still replaces team0's header_ops with ipgre_header. The sequence requires local network-administration access; later traffic treats team private data as an ip_tunnel and can hang the host.

CVSS severity5.5
Medium
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in the Linux kernel team driver allows local users to hang the system through crafted team and GRE device setup. team_port_add calls team_dev_type_check_change before later validation, so a rejected active GRE port still replaces team0's header_ops with ipgre_header. The sequence requires local network-administration access; later traffic treats team private data as an ip_tunnel and can hang the host.

The record

CVE
CVE-2025-68340
Published
Dec 23, 2025
Updated
Dec 23, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 23, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 23, 2025Record 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=1d76efe1577b4323609b1bcbfafa8b731eda071a <0ae9cfc454ea5ead5f3ddbdfe2e70270d8e2c8ef
  2. Affected versionversion=1d76efe1577b4323609b1bcbfafa8b731eda071a <4040b5e8963982a00aa821300cb746efc9f2947e
  3. Affected versionversion=1d76efe1577b4323609b1bcbfafa8b731eda071a <e3eed4f038214494af62c7d2d64749e5108ce6ca
  4. Affected versionversion=3.7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1d76efe1577b4323609b1bcbfafa8b731eda071a <0ae9cfc454ea5ead5f3ddbdfe2e70270d8e2c8ef; version=1d76efe1577b4323609b1bcbfafa8b731eda071a <4040b5e8963982a00aa821300cb746efc9f2947e; version=1d76efe1577b4323609b1bcbfafa8b731eda071a <e3eed4f038214494af62c7d2d64749e5108ce6ca; version=3.7

Published CVSS scores

5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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

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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