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CVE-2026-43468 (GCVE-0-2026-43468)

Vulnerability from cvelistv5 – Published: 2026-05-08 14:22 – Updated: 2026-05-11 22:25
VLAI
Title
net/mlx5: Fix deadlock between devlink lock and esw->wq
Summary
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.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: f1bc646c9a06f09aad5d8bacb87103b5573ee45e , < 0de867f6e34eae6907b367fd152c55e61cb98608 (git)
Affected: f1bc646c9a06f09aad5d8bacb87103b5573ee45e , < 957d2a58f7f8ebcbdd0a85935e0d2675134b890d (git)
Affected: f1bc646c9a06f09aad5d8bacb87103b5573ee45e , < 3c7313cb41b1b427078440364d2f042c276a1c0b (git)
Affected: f1bc646c9a06f09aad5d8bacb87103b5573ee45e , < 4a7838bebc38374f74baaf88bf2cf8d439a92923 (git)
Affected: f1bc646c9a06f09aad5d8bacb87103b5573ee45e , < 90e7e5d14d0bd25ffd019a3aa39d9f1c05fedbe1 (git)
Affected: f1bc646c9a06f09aad5d8bacb87103b5573ee45e , < aed763abf0e905b4b8d747d1ba9e172961572f57 (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.0
Unaffected: 0 , < 6.0 (semver)
Unaffected: 6.1.167 , ≤ 6.1.* (semver)
Unaffected: 6.6.130 , ≤ 6.6.* (semver)
Unaffected: 6.12.78 , ≤ 6.12.* (semver)
Unaffected: 6.18.19 , ≤ 6.18.* (semver)
Unaffected: 6.19.9 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/mlx5: Fix deadlock between devlink lock and esw-\u003ewq\n\nesw-\u003ework_queue executes esw_functions_changed_event_handler -\u003e\nesw_vfs_changed_event_handler and acquires the devlink lock.\n\n.eswitch_mode_set (acquires devlink lock in devlink_nl_pre_doit) -\u003e\nmlx5_devlink_eswitch_mode_set -\u003e mlx5_eswitch_disable_locked -\u003e\nmlx5_eswitch_event_handler_unregister -\u003e flush_workqueue deadlocks\nwhen esw_vfs_changed_event_handler executes.\n\nFix that by no longer flushing the work to avoid the deadlock, and using\na generation counter to keep track of work relevance. This avoids an old\nhandler manipulating an esw that has undergone one or more mode changes:\n- the counter is incremented in mlx5_eswitch_event_handler_unregister.\n- the counter is read and passed to the ephemeral mlx5_host_work struct.\n- the work handler takes the devlink lock and bails out if the current\n  generation is different than the one it was scheduled to operate on.\n- mlx5_eswitch_cleanup does the final draining before destroying the wq.\n\nNo longer flushing the workqueue has the side effect of maybe no longer\ncancelling pending vport_change_handler work items, but that\u0027s ok since\nthose are disabled elsewhere:\n- mlx5_eswitch_disable_locked disables the vport eq notifier.\n- mlx5_esw_vport_disable disarms the HW EQ notification and marks\n  vport-\u003eenabled under state_lock to false to prevent pending vport\n  handler from doing anything.\n- mlx5_eswitch_cleanup destroys the workqueue and makes sure all events\n  are disabled/finished."
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        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/957d2a58f7f8ebcbdd0a85935e0d2675134b890d"
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    "datePublished": "2026-05-08T14:22:28.889Z",
    "dateReserved": "2026-05-01T14:12:56.011Z",
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-02T19:37:41+00:00",
      "cve": "CVE-2026-43468",
      "id": "CVE-2026-43468",
      "initial_release_date": "2026-05-08T00:00:00+00:00",
      "product_status:known_affected": "246",
      "product_status:known_not_affected": "28",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net/mlx5: Fix deadlock between devlink lock and esw-\u003ewq",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43468.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-11T01:17:15Z",
      "cve": "CVE-2026-43468",
      "id": "CVE-2026-43468",
      "initial_release_date": "2026-05-13T03:33:35Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "482",
      "product_status:known_not_affected": "221",
      "product_status:recommended": "250",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-43468",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-43468.json",
      "version": "13"
    }
  }
}



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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.