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CVE PROGRAM SOURCE RECORDUnscored

CVE-2026-43468

net/mlx5: Fix deadlock between devlink lock and esw->wq

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: net/mlx5: Fix deadlock between devlink lock and esw->wq esw->work_queue executes esw_functions_changed_event_handler -> esw_vfs_changed_event_handler and acquires the devlink lock. .eswitch_mode_set (acquires devlink lock in devlink_nl_pre_doit) -> mlx5_devlink_eswitch_mode_set -> mlx5_eswitch_disable_locked -> mlx5_eswitch_event_handler_unregister -> flush_workqueue deadlocks when esw_vfs_changed_event_handler executes. Fix that by no longer flushing the work to avoid the deadlock, and using a generation counter to keep track of work relevance. This avoids an old handler manipulating an esw that has undergone one or more mode changes: - the counter is incremented in mlx5_eswitch_event_handler_unregister. - the counter is read and passed to the ephemeral mlx5_host_work struct. - the work handler takes the devlink lock and bails out if the current generation is different than the one it was scheduled to operate on. - mlx5_eswitch_cleanup does the final draining before destroying the wq. No longer flushing the workqueue has the side effect of maybe no longer cancelling pending vport_change_handler work items, but that's ok since those are disabled elsewhere: - mlx5_eswitch_disable_locked disables the vport eq notifier. - mlx5_esw_vport_disable disarms the HW EQ notification and marks vport->enabled under state_lock to false to prevent pending vport handler from doing anything. - mlx5_eswitch_cleanup destroys the workqueue and makes sure all events are disabled/finished.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • f1bc646c9a06f09aad5d8bacb87103b5573ee45e to < 0de867f6e34eae6907b367fd152c55e61cb98608affected
  • f1bc646c9a06f09aad5d8bacb87103b5573ee45e to < 957d2a58f7f8ebcbdd0a85935e0d2675134b890daffected
  • f1bc646c9a06f09aad5d8bacb87103b5573ee45e to < 3c7313cb41b1b427078440364d2f042c276a1c0baffected
  • f1bc646c9a06f09aad5d8bacb87103b5573ee45e to < 4a7838bebc38374f74baaf88bf2cf8d439a92923affected
  • f1bc646c9a06f09aad5d8bacb87103b5573ee45e to < 90e7e5d14d0bd25ffd019a3aa39d9f1c05fedbe1affected
  • f1bc646c9a06f09aad5d8bacb87103b5573ee45e to < aed763abf0e905b4b8d747d1ba9e172961572f57affected

Linux Linux

Default version status: affected

  • 6.0affected
  • 0 to < 6.0unaffected
  • 6.1.167 to ≤ 6.1.*unaffected
  • 6.6.130 to ≤ 6.6.*unaffected
  • 6.12.78 to ≤ 6.12.*unaffected
  • 6.18.19 to ≤ 6.18.*unaffected
  • 6.19.9 to ≤ 6.19.*unaffected
  • 7.0 to ≤ *unaffected

References