CVE-2026-43467 net/mlx5: Fix crash when moving to switchdev mode
In the Linux kernel, the following vulnerability has been resolved:

net/mlx5: Fix crash when moving to switchdev mode

When moving to switchdev mode when the device doesn't support IPsec,
we try to clean up the IPsec resources anyway which causes the crash
below, fix that by correctly checking for IPsec support before trying
to clean up its resources.

[27642.515799] WARNING: arch/x86/mm/fault.c:1276 at
do_user_addr_fault+0x18a/0x680, CPU#4: devlink/6490
[27642.517159] Modules linked in: xt_conntrack xt_MASQUERADE
ip6table_nat ip6table_filter ip6_tables iptable_nat nf_nat xt_addrtype
rpcsec_gss_krb5 auth_rpcgss oid_registry overlay mlx5_fwctl nfnetlink
zram zsmalloc mlx5_ib fuse rpcrdma rdma_ucm ib_uverbs ib_iser libiscsi
scsi_transport_iscsi ib_umad rdma_cm ib_ipoib iw_cm ib_cm mlx5_core
ib_core
[27642.521358] CPU: 4 UID: 0 PID: 6490 Comm: devlink Not tainted
6.19.0-rc5_for_upstream_min_debug_2026_01_14_16_47 #1 NONE
[27642.522923] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS
rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[27642.524528] RIP: 0010:do_user_addr_fault+0x18a/0x680
[27642.525362] Code: ff 0f 84 75 03 00 00 48 89 ee 4c 89 e7 e8 5e b9 22
00 49 89 c0 48 85 c0 0f 84 a8 02 00 00 f7 c3 60 80 00 00 74 22 31 c9 eb
   ae <0f> 0b 48 83 c4 10 48 89 ea 48 89 de 4c 89 f7 5b 5d 41 5c 41 5d
41
[27642.528166] RSP: 0018:ffff88810770f6b8 EFLAGS: 00010046
[27642.529038] RAX: 0000000000000000 RBX: 0000000000000002 RCX:
ffff88810b980f00
[27642.530158] RDX: 00000000000000a0 RSI: 0000000000000002 RDI:
ffff88810770f728
[27642.531270] RBP: 00000000000000a0 R08: 0000000000000000 R09:
0000000000000000
[27642.532383] R10: 0000000000000000 R11: 0000000000000000 R12:
ffff888103f3c4c0
[27642.533499] R13: 0000000000000000 R14: ffff88810770f728 R15:
0000000000000000
[27642.534614] FS:  00007f197c741740(0000) GS:ffff88856a94c000(0000)
knlGS:0000000000000000
[27642.535915] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[27642.536858] CR2: 00000000000000a0 CR3: 000000011334c003 CR4:
0000000000172eb0
[27642.537982] Call Trace:
[27642.538466]  <TASK>
[27642.538907]  exc_page_fault+0x76/0x140
[27642.539583]  asm_exc_page_fault+0x22/0x30
[27642.540282] RIP: 0010:_raw_spin_lock_irqsave+0x10/0x30
[27642.541134] Code: 07 85 c0 75 11 ba ff 00 00 00 f0 0f b1 17 75 06 b8
01 00 00 00 c3 31 c0 c3 90 0f 1f 44 00 00 53 9c 5b fa 31 c0 ba 01 00 00
   00 <f0> 0f b1 17 75 05 48 89 d8 5b c3 89 c6 e8 7e 02 00 00 48 89 d8
      5b
[27642.543936] RSP: 0018:ffff88810770f7d8 EFLAGS: 00010046
[27642.544803] RAX: 0000000000000000 RBX: 0000000000000202 RCX:
ffff888113ad96d8
[27642.545916] RDX: 0000000000000001 RSI: ffff88810770f818 RDI:
00000000000000a0
[27642.547027] RBP: 0000000000000098 R08: 0000000000000400 R09:
ffff88810b980f00
[27642.548140] R10: 0000000000000001 R11: ffff888101845a80 R12:
00000000000000a8
[27642.549263] R13: ffffffffa02a9060 R14: 00000000000000a0 R15:
ffff8881130d8a40
[27642.550379]  complete_all+0x20/0x90
[27642.551010]  mlx5e_ipsec_disable_events+0xb6/0xf0 [mlx5_core]
[27642.552022]  mlx5e_nic_disable+0x12d/0x220 [mlx5_core]
[27642.552929]  mlx5e_detach_netdev+0x66/0xf0 [mlx5_core]
[27642.553822]  mlx5e_netdev_change_profile+0x5b/0x120 [mlx5_core]
[27642.554821]  mlx5e_vport_rep_load+0x419/0x590 [mlx5_core]
[27642.555757]  ? xa_load+0x53/0x90
[27642.556361]  __esw_offloads_load_rep+0x54/0x70 [mlx5_core]
[27642.557328]  mlx5_esw_offloads_rep_load+0x45/0xd0 [mlx5_core]
[27642.558320]  esw_offloads_enable+0xb4b/0xc90 [mlx5_core]
[27642.559247]  mlx5_eswitch_enable_locked+0x34e/0x4f0 [mlx5_core]
[27642.560257]  ? mlx5_rescan_drivers_locked+0x222/0x2d0 [mlx5_core]
[27642.561284]  mlx5_devlink_eswitch_mode_set+0x5ac/0x9c0 [mlx5_core]
[27642.562334]  ? devlink_rate_set_ops_supported+0x21/0x3a0
[27642.563220]  devlink_nl_eswitch_set_doit+0x67/0xe0
[27642.564026]  genl_family_rcv_msg_doit+0xe0/0x130
[27642.564816]  genl_rcv_msg+0x183/0x290
[27642.565466]  ? __devlink_nl_pre_doit.isra.0+0x160/0x160
[27642.566329]  ? d
---truncated---
CVSS v3.1 score: 5.5