CVE-2026-23035

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

net/mlx5e: Pass netdev to mlx5e_destroy_netdev instead of priv

mlx5e_priv is an unstable structure that can be memset(0) if profile

attaching fails.

Pass netdev to mlx5e_destroy_netdev() to guarantee it will work on a

valid netdev.

On mlx5e_remove: Check validity of priv->profile, before attempting

to cleanup any resources that might be not there.

This fixes a kernel oops in mlx5e_remove when switchdev mode fails due

to change profile failure.

$ devlink dev eswitch set pci/0000:00:03.0 mode switchdev

Error: mlx5_core: Failed setting eswitch to offloads.

dmesg:

workqueue: Failed to create a rescuer kthread for wq "mlx5e": -EINTR

mlx5_core 0012:03:00.1: mlx5e_netdev_init_profile:6214:(pid 37199): mlx5e_priv_init failed, err=-12

mlx5_core 0012:03:00.1 gpu3rdma1: mlx5e_netdev_change_profile: new profile init failed, -12

workqueue: Failed to create a rescuer kthread for wq "mlx5e": -EINTR

mlx5_core 0012:03:00.1: mlx5e_netdev_init_profile:6214:(pid 37199): mlx5e_priv_init failed, err=-12

mlx5_core 0012:03:00.1 gpu3rdma1: mlx5e_netdev_change_profile: failed to rollback to orig profile, -12

$ devlink dev reload pci/0000:00:03.0 ==> oops

BUG: kernel NULL pointer dereference, address: 0000000000000370

PGD 0 P4D 0

Oops: Oops: 0000 [#1] SMP NOPTI

CPU: 15 UID: 0 PID: 520 Comm: devlink Not tainted 6.18.0-rc5+ #115 PREEMPT(voluntary)

Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-2.fc40 04/01/2014

RIP: 0010:mlx5e_dcbnl_dscp_app+0x23/0x100

RSP: 0018:ffffc9000083f8b8 EFLAGS: 00010286

RAX: ffff8881126fc380 RBX: ffff8881015ac400 RCX: ffffffff826ffc45

RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff8881035109c0

RBP: ffff8881035109c0 R08: ffff888101e3e838 R09: ffff888100264e10

R10: ffffc9000083f898 R11: ffffc9000083f8a0 R12: ffff888101b921a0

R13: ffff888101b921a0 R14: ffff8881015ac9a0 R15: ffff8881015ac400

FS: 00007f789a3c8740(0000) GS:ffff88856aa59000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 0000000000000370 CR3: 000000010b6c0001 CR4: 0000000000370ef0

Call Trace:

<TASK>

mlx5e_remove+0x57/0x110

device_release_driver_internal+0x19c/0x200

bus_remove_device+0xc6/0x130

device_del+0x160/0x3d0

? devl_param_driverinit_value_get+0x2d/0x90

mlx5_detach_device+0x89/0xe0

mlx5_unload_one_devl_locked+0x3a/0x70

mlx5_devlink_reload_down+0xc8/0x220

devlink_reload+0x7d/0x260

devlink_nl_reload_doit+0x45b/0x5a0

genl_family_rcv_msg_doit+0xe8/0x140