CVE-2026-45907

CVE Details

Release Date:	2026-05-27
Impact:	Moderate	What is this?

Description

In the Linux kernel, the following vulnerability has been resolved: net/mlx5e: Fix deadlocks between devlink and netdev instance locks In the mentioned "Fixes" commit, various work tasks triggering devlink health reporter recovery were switched to use netdev_trylock to protect against concurrent tear down of the channels being recovered. But this had the side effect of introducing potential deadlocks because of incorrect lock ordering. The correct lock order is described by the init flow: probe_one -> mlx5_init_one (acquires devlink lock) -> mlx5_init_one_devl_locked -> mlx5_register_device -> mlx5_rescan_drivers_locked -...-> mlx5e_probe -> _mlx5e_probe -> register_netdev (acquires rtnl lock) -> register_netdevice (acquires netdev lock) => devlink lock -> rtnl lock -> netdev lock. But in the current recovery flow, the order is wrong: mlx5e_tx_err_cqe_work (acquires netdev lock) -> mlx5e_reporter_tx_err_cqe -> mlx5e_health_report -> devlink_health_report (acquires devlink lock => boom!) -> devlink_health_reporter_recover -> mlx5e_tx_reporter_recover -> mlx5e_tx_reporter_recover_from_ctx -> mlx5e_tx_reporter_err_cqe_recover The same pattern exists in: mlx5e_reporter_rx_timeout mlx5e_reporter_tx_ptpsq_unhealthy mlx5e_reporter_tx_timeout Fix these by moving the netdev_trylock calls from the work handlers lower in the call stack, in the respective recovery functions, where they are actually necessary.

See more information about CVE-2026-45907 from MITRE CVE dictionary and NIST NVD

NOTE: The following CVSS metrics and score provided are preliminary and subject to review.

CVSS v3 metrics

Base Score:	5.5
Vector String:	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Version:	3.1
Attack Vector:	Local
Attack Complexity:	Low
Privileges Required:	Low
User Interaction:	None
Scope:	Unchanged
Confidentiality Impact:	None
Integrity Impact:	None
Availability Impact:	High

Errata information

Platform	Errata	Release Date
Oracle Linux version 10 (kernel-uek)	ELSA-2026-500248	2026-09-04
Oracle Linux version 9 (kernel-uek)	ELSA-2026-500248	2026-09-04