CVE-2026-43012 Affecting kernel-source package, versions <6.12.0-160000.34.1
Threat Intelligence
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Test your applications- Snyk IDSNYK-SLES1600-KERNELSOURCE-17343398
- published16 Jun 2026
- disclosed5 Jun 2026
Introduced: 5 Jun 2026
NewCVE-2026-43012 (opens in a new tab)How to fix?
Upgrade SLES:16.0.0 kernel-source to version 6.12.0-160000.34.1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-source package and not the kernel-source package as distributed by SLES.
See How to fix? for SLES:16.0.0 relevant fixed versions and status.
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
References
- https://www.suse.com/security/cve/CVE-2026-43012.html
- https://bugzilla.suse.com/1264016
- https://git.kernel.org/stable/c/2ebb13f3e8be0b61f72425b34cce60c8b6ad1891
- https://git.kernel.org/stable/c/403186400a1a6166efe7031edc549c15fee4723f
- https://git.kernel.org/stable/c/4363698838b7ec6e8d85b179495889aa7e522f91
- https://git.kernel.org/stable/c/e27153b2bd6e6699b544ac4dfa35d167bed5e642