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

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于team_port_add中设备类型更改不当，可能导致崩溃。

CVSS 7.8 · High EPSS 0.15% · P4

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux 1d76efe1577b4323609b1bcbfafa8b731eda071a< f82d1fb65549de241fe312fcb2bcb8e0ad7b424d affected
1d76efe1577b4323609b1bcbfafa8b731eda071a< c8b15b0d2eec3b5c7f585e5a53dfc8d36c818283 affected
1d76efe1577b4323609b1bcbfafa8b731eda071a< a74ab1b532ecc5f9106621a8f75b4c3d04466b35 affected
1d76efe1577b4323609b1bcbfafa8b731eda071a< e26235840fd961e4ebe5568f11a2a078cf726663 affected
1d76efe1577b4323609b1bcbfafa8b731eda071a< 4040b5e8963982a00aa821300cb746efc9f2947e affected
1d76efe1577b4323609b1bcbfafa8b731eda071a< e3eed4f038214494af62c7d2d64749e5108ce6ca affected
1d76efe1577b4323609b1bcbfafa8b731eda071a< 0ae9cfc454ea5ead5f3ddbdfe2e70270d8e2c8ef affected
3.7 affected
… +8 more rows
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I. Basic Information for CVE-2025-68340

Vulnerability Information
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Vulnerability Title
team: Move team device type change at the end of team_port_add
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: team: Move team device type change at the end of team_port_add Attempting to add a port device that is already up will expectedly fail, but not before modifying the team device header_ops. 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 header_ops->create of team0 is changed from eth_header to ipgre_header in the call to team_dev_type_check_change. Later when we end up in ipgre_header() struct ip_tunnel* 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 team_dev_type_check_change 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 port_dev is not the same type as dev, dev takes mtu from port_dev - If port_dev is the same type as dev, port_dev takes mtu from dev This is done by adding a conditional before the call to dev_set_mtu to prevent it from assigning port_dev->mtu = dev->mtu and instead letting team_dev_type_check_change assign dev->mtu = port_dev->mtu. The conditional is needed because the patch moves the call to team_dev_type_check_change past dev_set_mtu. Testing: - team device driver in-tree selftests - Add/remove various devices as slaves of team device - syzbot
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于team_port_add中设备类型更改不当，可能导致崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 1d76efe1577b4323609b1bcbfafa8b731eda071a ~ f82d1fb65549de241fe312fcb2bcb8e0ad7b424d -
Linux Linux 3.7 -

II. Public POCs for CVE-2025-68340

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III. Intelligence Information for CVE-2025-68340

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Patches & Fixes for CVE-2025-68340 (1)

Same Patch Batch · Linux · 2025-12-23 · 6 CVEs total

CVE-2025-68341 9.8 CRITICAL veth: reduce XDP no_direct return section to fix race
CVE-2025-68343 can: gs_usb: gs_usb_receive_bulk_callback(): check actual_length before accessing header
CVE-2025-68342 can: gs_usb: gs_usb_receive_bulk_callback(): check actual_length before accessing data
CVE-2025-68339 atm/fore200e: Fix possible data race in fore200e_open()
CVE-2025-68338 net: dsa: microchip: Don't free uninitialized ksz_irq

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-68340

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