CVE-2026-46165 (GCVE-0-2026-46165)

Vulnerability from cvelistv5 – Published: 2026-05-28 09:36 – Updated: 2026-06-14 17:59
VLAI
Title
openvswitch: vport: fix self-deadlock on release of tunnel ports
Summary
In the Linux kernel, the following vulnerability has been resolved: openvswitch: vport: fix self-deadlock on release of tunnel ports vports are used concurrently and protected by RCU, so netdev_put() must happen after the RCU grace period. So, either in an RCU call or after the synchronize_net(). The rtnl_delete_link() must happen under RTNL and so can't be executed in RCU context. Calling synchronize_net() while holding RTNL is not a good idea for performance and system stability under load in general, so calling netdev_put() in RCU call is the right solution here. However, when the device is deleted, rtnl_unlock() will call netdev_run_todo() and block until all the references are gone. In the current code this means that we never reach the call_rcu() and the vport is never freed and the reference is never released, causing a self-deadlock on device removal. Fix that by moving the rcu_call() before the rtnl_unlock(), so the scheduled RCU callback will be executed when synchronize_net() is called from the rtnl_unlock()->netdev_run_todo() while the RTNL itself is already released.
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
Linux Linux Affected: 9d56aced21fb9c104e8a3f3be9b21fbafe448ffc , < 8ae6c15fc473c9ad03b0173330cce9a092c76154 (git)
Affected: 42f0d3d81209654c08ffdde5a34b9b92d2645896 , < c741433f6c8dcdecd1d9549d89053761fd1ea413 (git)
Affected: bbe7bd722bfaea36aab3da6cc60fb4a05c644643 , < 6522d59fb7de55ce0f0f285d962243ddffebb01f (git)
Affected: 98b726ab5e2a4811e27c28e4d041f75bba147eab , < 3df75fff46b1517eb479d8e6b8e3500763715dd0 (git)
Affected: 6931d21f87bc6d657f145798fad0bf077b82486c , < 366c482965c673565ecb8bcfb15d5548f13a6a10 (git)
Affected: 6931d21f87bc6d657f145798fad0bf077b82486c , < aa69918bd418e700309fdd08509dba324fb24296 (git)
Affected: b8c56a3fc5d879c0928f207a756b0f067f06c6a8 (git)
Affected: 6.1.168 , < 6.1.175 (semver)
Affected: 6.6.131 , < 6.6.140 (semver)
Affected: 6.12.80 , < 6.12.88 (semver)
Affected: 6.18.21 , < 6.18.30 (semver)
Affected: 6.19.11 , < 6.20 (semver)
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Linux Linux Affected: 7.0
Unaffected: 0 , < 7.0 (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.140 , ≤ 6.6.* (semver)
Unaffected: 6.12.88 , ≤ 6.12.* (semver)
Unaffected: 6.18.30 , ≤ 6.18.* (semver)
Unaffected: 7.0.7 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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Calling synchronize_net()\\nwhile holding RTNL is not a good idea for performance and system\\nstability under load in general, so calling netdev_put() in RCU call\\nis the right solution here.\\n\\nHowever,\\nwhen the device is deleted, rtnl_unlock() will call netdev_run_todo()\\nand block until all the references are gone.  In the current code this\\nmeans that we never reach the call_rcu() and the vport is never freed\\nand the reference is never released, causing a self-deadlock on device\\nremoval.\\n\\nFix that by moving the rcu_call() before the rtnl_unlock(), so the\\nscheduled RCU callback will be executed when synchronize_net() is\\ncalled from the rtnl_unlock()-\u003enetdev_run_todo() while the RTNL itself\\nis already 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    "redhat_vex": {
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      "title": "kernel: openvswitch: vport: fix self-deadlock on release of tunnel ports",
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      "current_release_date": "2026-07-21T23:54:47Z",
      "cve": "CVE-2026-46165",
      "id": "CVE-2026-46165",
      "initial_release_date": "2026-05-29T01:15:57Z",
      "product_status:known_not_affected": "236",
      "product_status:recommended": "102",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-46165",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-46165.json",
      "version": "5"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • 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.