CVE-2026-43199

/// Technical description

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

net/mlx5e: Fix "scheduling while atomic" in IPsec MAC address query

Fix a "scheduling while atomic" bug in mlx5e_ipsec_init_macs() by

replacing mlx5_query_mac_address() with ether_addr_copy() to get the

local MAC address directly from netdev->dev_addr.

The issue occurs because mlx5_query_mac_address() queries the hardware

which involves mlx5_cmd_exec() that can sleep, but it is called from

the mlx5e_ipsec_handle_event workqueue which runs in atomic context.

The MAC address is already available in netdev->dev_addr, so no need

to query hardware. This avoids the sleeping call and resolves the bug.

Call trace:

BUG: scheduling while atomic: kworker/u112:2/69344/0x00000200

__schedule+0x7ab/0xa20

schedule+0x1c/0xb0

schedule_timeout+0x6e/0xf0

__wait_for_common+0x91/0x1b0

cmd_exec+0xa85/0xff0 [mlx5_core]

mlx5_cmd_exec+0x1f/0x50 [mlx5_core]

mlx5_query_nic_vport_mac_address+0x7b/0xd0 [mlx5_core]

mlx5_query_

/// 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