CVE-2026-43234

/// Technical description

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

team: avoid NETDEV_CHANGEMTU event when unregistering slave

syzbot is reporting

unregister_netdevice: waiting for netdevsim0 to become free. Usage count = 3

ref_tracker: netdev@ffff88807dcf8618 has 1/2 users at

__netdev_tracker_alloc include/linux/netdevice.h:4400 [inline]

netdev_hold include/linux/netdevice.h:4429 [inline]

inetdev_init+0x201/0x4e0 net/ipv4/devinet.c:286

inetdev_event+0x251/0x1610 net/ipv4/devinet.c:1600

notifier_call_chain+0x19d/0x3a0 kernel/notifier.c:85

call_netdevice_notifiers_mtu net/core/dev.c:2318 [inline]

netif_set_mtu_ext+0x5aa/0x800 net/core/dev.c:9886

netif_set_mtu+0xd7/0x1b0 net/core/dev.c:9907

dev_set_mtu+0x126/0x260 net/core/dev_api.c:248

team_port_del+0xb07/0xcb0 drivers/net/team/team_core.c:1333

team_del_slave drivers/net/team/team_core.c:1936 [inline]

team_device_event+0x207/0x5b0 drivers/net/tea

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References