CVE-2025-68340

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

This vulnerability is rated as Moderate severity because triggering the flaw requires local administrative privileges (specifically CAP_NET_ADMIN) or access to unprivileged user namespaces to manipulate network interface configurations. In standard Red Hat Enterprise Linux environments, an administrator must attempt to add an already active network device to a team interface, leaving the interface in an inconsistent header state. The resulting impact is confined to a local denial of service caused by a kernel crash or hang, without exposing confidential data or permitting arbitrary code execution.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.