CVE-2026-43468net/mlx5: Fix deadlock between devlink lock and esw->wq
- 5.5MediumCVSS base score
- 0.09%Exploitation in 30 daysEPSS · top 100% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By Linux
- 7 days later
· 7 days later
Published
- 6 months later
· 6 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Analyzed | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.09% · top 100% of all CVEs (12 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Affected products
- affected f1bc646c9a06f09aad5d8bacb87103b5573ee45e – < 0de867f6e34eae6907b367fd152c55e61cb98608
- affected f1bc646c9a06f09aad5d8bacb87103b5573ee45e – < 957d2a58f7f8ebcbdd0a85935e0d2675134b890d
- affected f1bc646c9a06f09aad5d8bacb87103b5573ee45e – < 3c7313cb41b1b427078440364d2f042c276a1c0b
- affected f1bc646c9a06f09aad5d8bacb87103b5573ee45e – < 4a7838bebc38374f74baaf88bf2cf8d439a92923
- affected f1bc646c9a06f09aad5d8bacb87103b5573ee45e – < 90e7e5d14d0bd25ffd019a3aa39d9f1c05fedbe1
- affected f1bc646c9a06f09aad5d8bacb87103b5573ee45e – < aed763abf0e905b4b8d747d1ba9e172961572f57
- affected 6.0
- unaffected < 6.0
- unaffected 6.1.167 – ≤ 6.1.*
- unaffected 6.6.130 – ≤ 6.6.*
- unaffected 6.12.78 – ≤ 6.12.*
- unaffected 6.18.19 – ≤ 6.18.*
- unaffected 6.19.9 – ≤ 6.19.*
- unaffected 7.0 – ≤ *
References
References6
- https://git.kernel.org/stable/c/0de867f6e34eae6907b367fd152c55e61cb98608 (opens in a new tab)
- https://git.kernel.org/stable/c/957d2a58f7f8ebcbdd0a85935e0d2675134b890d (opens in a new tab)
- https://git.kernel.org/stable/c/3c7313cb41b1b427078440364d2f042c276a1c0b (opens in a new tab)
- https://git.kernel.org/stable/c/4a7838bebc38374f74baaf88bf2cf8d439a92923 (opens in a new tab)
- https://git.kernel.org/stable/c/90e7e5d14d0bd25ffd019a3aa39d9f1c05fedbe1 (opens in a new tab)
- https://git.kernel.org/stable/c/aed763abf0e905b4b8d747d1ba9e172961572f57 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-28774 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-43468)Record last updated .