CVE-2025-68340: team: Move team device type change at the end of team_port_add

Q: What is the severity of CVE-2025-68340?

CVE-2025-68340 is classified as a medium severity vulnerability in the Linux kernel.

Q: How do I fix CVE-2025-68340?

To mitigate CVE-2025-68340, update your Linux kernel to the latest stable version that includes the fix.

Q: What systems are affected by CVE-2025-68340?

CVE-2025-68340 affects versions of the Linux kernel that have the team device feature implemented.

Q: What type of vulnerability is CVE-2025-68340?

CVE-2025-68340 is a vulnerability related to improper handling during the addition of a port device in Linux team devices.

Q: Is there a known exploitation method for CVE-2025-68340?

As of now, there's no public knowledge of active exploitation methods for CVE-2025-68340.

Published Dec 23, 2025

Updated

In the Linux kernel, the following vulnerability has been resolved:

team: Move team device type change at the end of teamportadd

Attempting to add a port device that is already up will expectedly fail, but not before modifying the team device headerops.

In the case of the syzbot reproducer the gre0 device is already in state UP when it attempts to add it as a port device of team0, this fails but before that headerops->create of team0 is changed from ethheader to ipgreheader in the call to teamdevtypecheckchange.

Later when we end up in ipgreheader() struct iptunnel points to nonsense as the private data of the device still holds a struct team.

Example sequence of iproute2 commands to reproduce the hang/BUG(): ip link add dev team0 type team ip link add dev gre0 type gre ip link set dev gre0 up ip link set dev gre0 master team0 ip link set dev team0 up ping -I team0 1.1.1.1

Move teamdevtypecheckchange down where all other checks have passed as it changes the dev type with no way to restore it in case one of the checks that follow it fail.

Also make sure to preserve the origial mtu assignment: - If portdev is not the same type as dev, dev takes mtu from portdev - If portdev is the same type as dev, portdev takes mtu from dev

This is done by adding a conditional before the call to devsetmtu to prevent it from assigning portdev->mtu = dev->mtu and instead letting teamdevtypecheckchange assign dev->mtu = portdev->mtu. The conditional is needed because the patch moves the call to teamdevtypecheckchange past devsetmtu.

Testing: - team device driver in-tree selftests - Add/remove various devices as slaves of team device - syzbot

Affected Software

258 affected componentsFixes available

linux/kernel

Microsoft azl3 kernel 6.6.117.1-1

Microsoft cbl2 kernel 5.15.186.1-1

Patch available

Linux Linux kernel>=3.7<5.15.199

Linux Linux kernel>=5.16<6.1.162

Linux Linux kernel>=6.2<6.6.123

Linux Linux kernel>=6.7<6.12.61

Linux Linux kernel>=6.13<6.17.11

Linux Linux kernel=6.18-rc1

Linux Linux kernel=6.18-rc2

Linux Linux kernel=6.18-rc3

Linux Linux kernel=6.18-rc4

Linux Linux kernel=6.18-rc5

Linux Linux kernel=6.18-rc6

Linux Linux kernel=6.18-rc7

ubuntu/linux*

ubuntu/linux-aws*

ubuntu/linux-azure*

ubuntu/linux-lts-xenial*

ubuntu/linux*

ubuntu/linux-aws*

ubuntu/linux-aws-hwe*

ubuntu/linux-azure*

ubuntu/linux-gcp*

ubuntu/linux-hwe*

ubuntu/linux-hwe-edge*

ubuntu/linux-kvm*

ubuntu/linux-oracle*

ubuntu/linux-fips*

ubuntu/linux*

ubuntu/linux-aws*

ubuntu/linux-aws-5.0*

ubuntu/linux-aws-5.3*

ubuntu/linux-aws-5.4*

ubuntu/linux-azure*

ubuntu/linux-azure-4.15*

ubuntu/linux-azure-5.3*

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ubuntu/linux-azure-edge*

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ubuntu/linux-ibm-5.4*

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ubuntu/linux-oem*

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ubuntu/linux-oracle-5.0*

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ubuntu/linux-raspi-5.4*

ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

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ubuntu/linux-aws-5.11*

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ubuntu/linux-aws-5.8*

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ubuntu/linux-azure-5.8*

ubuntu/linux-azure-fde*

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ubuntu/linux-gcp-5.8*

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ubuntu/linux-hwe-5.8*

ubuntu/linux-ibm*

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ubuntu/linux-iot*

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ubuntu/linux-gcp-5.19*

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ubuntu/linux-gke<5.15.0-1101.107

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ubuntu/linux-gkeop<5.15.0-1088.96

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ubuntu/linux-hwe-5.19*

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ubuntu/linux-hwe-6.8<6.8.0-106.106~22.04.1

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ubuntu/linux-ibm-6.8<6.8.0-1049.49~22.04.1

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ubuntu/linux-intel-iot-realtime*

ubuntu/linux-intel-iotg<5.15.0-1100.106

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ubuntu/linux-kvm<5.15.0-1097.102

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ubuntu/linux-lowlatency<5.15.0-175.185

5.15.0-175.185

ubuntu/linux-lowlatency-hwe-5.19*

ubuntu/linux-lowlatency-hwe-6.2*

ubuntu/linux-lowlatency-hwe-6.5*

ubuntu/linux-lowlatency-hwe-6.8<6.8.0-106.106.1~22.04.1

6.8.0-106.106.1~22.04.1

ubuntu/linux-nvidia<5.15.0-1100.101

5.15.0-1100.101

ubuntu/linux-nvidia-6.2*

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ubuntu/linux-nvidia-tegra<5.15.0-1057.57

5.15.0-1057.57

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ubuntu/linux-oem-5.17*

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ubuntu/linux-oem-6.1*

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ubuntu/linux-oracle<5.15.0-1102.108

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ubuntu/linux-oracle-6.5*

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6.8.0-1047.48~22.04.1

ubuntu/linux-raspi<5.15.0-1099.102

5.15.0-1099.102

ubuntu/linux-realtime*

ubuntu/linux-riscv*

ubuntu/linux-riscv-5.19*

ubuntu/linux-riscv-6.5*

ubuntu/linux-riscv-6.8<6.8.0-106.106~22.04.1

6.8.0-106.106~22.04.1

ubuntu/linux-starfive-5.19*

ubuntu/linux-starfive-6.2*

ubuntu/linux-starfive-6.5*

ubuntu/linux-xilinx-zynqmp<5.15.0-1070.74

5.15.0-1070.74

ubuntu/linux-bluefield<5.15.0-1089.91

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ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

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ubuntu/linux-gcp-fips*

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ubuntu/linux-azure-nvidia<6.8.0-1039.42

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ubuntu/linux-gcp<6.8.0-1052.55

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ubuntu/linux-oem-6.11*

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ubuntu/linux-oem-6.8*

ubuntu/linux-oracle<6.8.0-1047.48

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ubuntu/linux-raspi-realtime*

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6.17.0-1010.10

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6.17.0-1008.9

ubuntu/linux-riscv<6.17.0-19.19.1

6.17.0-19.19.1

ubuntu/linux-vmware*

debian/linux

6.1.176-16.1.190-16.12.107-16.12.116-17.2.15-17.3.4-1

Remediation

Recommended actions to resolve this vulnerability, in priority order.

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Fixed in 5.15.0-1105.112~20.04.1
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Fixed in 5.15.0-1106.115~20.04.1
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Fixed in 5.15.0-176.186~20.04.1
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Fixed in 5.15.0-1099.102~20.04.1
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Fixed in 5.15.0-1100.106~20.04.1
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Fixed in 5.15.0-175.185~20.04.1
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Fixed in 5.15.0-1057.57~20.04.1
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Fixed in 5.15.0-1102.108~20.04.1
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Fixed in 5.15.0-1099.103~20.04.1
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Fixed in 5.15.0-176.186
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Fixed in 5.15.0-1105.112
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Fixed in 6.8.0-1050.53~22.04.1
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Fixed in 5.15.0-1110.119
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Fixed in 5.15.0-1100.106
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Fixed in 5.15.0-175.185
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Fixed in 6.8.0-106.106~22.04.1
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Fixed in 5.15.0-1097.99
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Fixed in 5.15.0-1104.113
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Fixed in 6.8.1-1045.46~22.04.1
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Fixed in 5.15.0-1105.112+fips1
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Fixed in 5.15.0-176.186+fips1
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Fixed in 5.15.0-1105.114+fips1
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Fixed in 6.8.0-106.106
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Fixed in 6.8.0-1050.53
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Fixed in 6.8.0-1052.55
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Fixed in 6.17.0-1009.9~24.04.3
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Fixed in 6.8.0-1048.53
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Fixed in 6.8.0-1035.38
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Fixed in 6.17.0-19.19~24.04.2
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Fixed in 6.8.0-1049.49
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Fixed in 6.8.0-106.106.1
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Fixed in 6.8.0-1049.52
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Fixed in 6.17.0-1018.18
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Fixed in 6.8.0-1049.52.1
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Fixed in 6.8.0-1020.20
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Fixed in 6.17.0-1017.17
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Fixed in 6.8.0-1047.48
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Fixed in 6.17.0-1009.9~24.04.1
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Fixed in 6.8.0-1050.54
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Fixed in 6.17.0-19.19.1~24.04.1
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Fixed in 6.8.0-1028.29
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Fixed in 6.8.0-1017.21
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Fixed in 6.8.0-2040.41
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Fixed in 6.8.1-1045.46
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Fixed in 6.17.0-1008.9~24.04.1
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Fixed in 6.8.0-1050.53+fips1
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Fixed in 6.8.0-1052.58+fips1
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Fixed in 6.8.0-106.106+fips1
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Fixed in 6.8.0-1052.55+fips1
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Fixed in 6.17.0-19.19
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Fixed in 6.17.0-1009.9
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Fixed in 6.17.0-1010.10
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Fixed in 6.17.0-1009.9
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Fixed in 6.17.0-1009.9
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Fixed in 6.17.0-1010.10
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Fixed in 6.17.0-1008.9
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Fixed in 6.17.0-19.19.1
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Fixed in 6.1.176-1Fixed in 6.1.190-1Fixed in 6.12.107-1Fixed in 6.12.116-1Fixed in 7.2.15-1Fixed in 7.3.4-1

Event History

Dec 23, 2025

CVE Published

via MITRE·01:58 PM

Data Sourced

via MITRE·01:58 PM

DescriptionSeverity

Data Sourced

via OSV·02:16 PM

DescriptionSeverityAffected Software

Event

via OSV·02:16 PM

Data Sourced

via NVD·02:16 PM

RemedyDescriptionSeverityAffected Software

Dec 24, 2025

Data Sourced

via Microsoft·01:04 AM

DescriptionSeverityWeaknessAffected Software

Parent advisories

This vulnerability appears in the following advisories.

DSA-6127

Peer vulnerabilities

Found alongside the following vulnerabilities.

Frequently Asked Questions

What is the severity of CVE-2025-68340?

CVE-2025-68340 is classified as a medium severity vulnerability in the Linux kernel.

How do I fix CVE-2025-68340?

To mitigate CVE-2025-68340, update your Linux kernel to the latest stable version that includes the fix.

What systems are affected by CVE-2025-68340?

CVE-2025-68340 affects versions of the Linux kernel that have the team device feature implemented.

What type of vulnerability is CVE-2025-68340?

CVE-2025-68340 is a vulnerability related to improper handling during the addition of a port device in Linux team devices.

Is there a known exploitation method for CVE-2025-68340?

As of now, there's no public knowledge of active exploitation methods for CVE-2025-68340.

CVE-2025-68340: team: Move team device type change at the end of team_port_add

Affected Software

Remediation

Event History

Parent advisories

Peer vulnerabilities

Frequently Asked Questions

What is the severity of CVE-2025-68340?

How do I fix CVE-2025-68340?

What systems are affected by CVE-2025-68340?

What type of vulnerability is CVE-2025-68340?

Is there a known exploitation method for CVE-2025-68340?

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