CVE-2026-46165 (GCVE-0-2026-46165)
Vulnerability from cvelistv5 – Published: 2026-05-28 09:36 – Updated: 2026-06-14 17:59
VLAI
EPSS
VEX
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)
Assigner
References
6 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| 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) |
guessed | |
| 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) |
guessed |
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"value": "CWE-667"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
},
"redhat_vex": {
"aggregate_severity": "Low",
"current_release_date": "2026-06-28T07:41:14+00:00",
"cve": "CVE-2026-46165",
"id": "CVE-2026-46165",
"initial_release_date": "2026-05-28T00:00:00+00:00",
"product_status:known_affected": "14",
"product_status:known_not_affected": "260",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: openvswitch: vport: fix self-deadlock on release of tunnel ports",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46165.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-10-01T01:08:10Z",
"cve": "CVE-2026-46165",
"id": "CVE-2026-46165",
"initial_release_date": "2026-05-29T01:15:57Z",
"product_status:known_affected": "2",
"product_status:known_not_affected": "270",
"product_status:recommended": "277",
"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": "13"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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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.
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