CVE-2026-43012

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

net/mlx5: Fix switchdev mode rollback in case of failure

If for some internal reason switchdev mode fails, we rollback to legacy

mode, before this patch, rollback will unregister the uplink netdev and

leave it unregistered causing the below kernel bug.

To fix this, we need to avoid netdev unregister by setting the proper

rollback flag 'MLX5_PRIV_FLAGS_SWITCH_LEGACY' to indicate legacy mode.

devlink (431) used greatest stack depth: 11048 bytes left

mlx5_core 0000:00:03.0: E-Switch: Disable: mode(LEGACY), nvfs(0), \

necvfs(0), active vports(0)

mlx5_core 0000:00:03.0: E-Switch: Supported tc chains and prios offload

mlx5_core 0000:00:03.0: Loading uplink representor for vport 65535

mlx5_core 0000:00:03.0: mlx5_cmd_out_err:816:(pid 456): \

QUERY_HCA_CAP(0x100) op_mod(0x0) failed, \

status bad parameter(0x3), syndrome (0x3a3846), err(-22)

mlx5_core 0000:00:03.0 enp0s3np0 (unregistered): Unloading uplink \

representor for vport 65535

------------[ cut here ]------------

kernel BUG at net/core/dev.c:12070!

Oops: invalid opcode: 0000 [#1] SMP NOPTI

CPU: 2 UID: 0 PID: 456 Comm: devlink Not tainted 6.16.0-rc3+ \

#9 PREEMPT(voluntary)

RIP: 0010:unregister_netdevice_many_notify+0x123/0xae0

...

Call Trace:

[ 90.923094] unregister_netdevice_queue+0xad/0xf0

[ 90.923323] unregister_netdev+0x1c/0x40

[ 90.923522] mlx5e_vport_rep_unload+0x61/0xc6

[ 90.923736] esw_offloads_enable+0x8e6/0x920

[ 90.923947] mlx5_eswitch_enable_locked+0x349/0x430

[ 90.924182] ? is_mp_supported+0x57/0xb0

[ 90.924376] mlx5_devlink_eswitch_mode_set+0x167/0x350

[ 90.924628] devlink_nl_eswitch_set_doit+0x6f/0xf0

[ 90.924862] genl_family_rcv_msg_doit+0xe8/0x140

[ 90.925088] genl_rcv_msg+0x18b/0x290

[ 90.925269] ? __pfx_devlink_nl_pre_doit+0x10/0x10

[ 90.925506] ? __pfx_devlink_nl_eswitch_set_doit+0x10/0x10

[ 90.925766] ? __pfx_devlink_nl_post_doit+0x10/0x10

[ 90.926001] ? __pfx_genl_rcv_msg+0x10/0x10

[ 90.926206] netlink_rcv_skb+0x52/0x100

[ 90.926393] genl_rcv+0x28/0x40

[ 90.926557] netlink_unicast+0x27d/0x3d0

[ 90.926749] netlink_sendmsg+0x1f7/0x430

[ 90.926942] __sys_sendto+0x213/0x220

[ 90.927127] ? __sys_recvmsg+0x6a/0xd0

[ 90.927312] __x64_sys_sendto+0x24/0x30

[ 90.927504] do_syscall_64+0x50/0x1c0

[ 90.927687] entry_SYSCALL_64_after_hwframe+0x76/0x7e

[ 90.927929] RIP: 0033:0x7f7d0363e047