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CVE-2026-46165

📛 CVE Title

openvswitch: vport: fix self-deadlock on release of tunnel ports

Description

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.

Overview

State
PUBLISHED
Assigner (CNA)
Linux
CVSS severity
high
CVSS score
CVSS 7.1 / 10 7.1 7.1 / 10
CVSS vector
AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Effective score
7.1 / 10 HIGH source: CNA overview
MSRC score
5.5 / 10 MEDIUM MS rating: Moderate
CWE(s)
—
Reserved
2026-05-13
Published
2026-05-28 09:36 UTC
Last updated
2026-06-01 16:19 UTC
Source
https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/46xxx/CVE-2026-46165.json
Linked Threat
CVE-2026-46165 — CVE-2026-46165

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published
2026-05-28 10:16:32 UTC
NVD last modified
2026-06-17 10:53:12 UTC
NVD CVSS v3.1
CVSS 5.5 / 10 5.5 5.5 / 10 MEDIUM source: nvd@nist.gov
NVD CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Exploitability subscore
1.8 / 10
Impact subscore
3.6 / 10
EPSS score
0.0010 (probability of exploitation in next 30 days)
EPSS percentile
0.96% vs all CVEs — higher = more likely to be exploited, as of 2026-07-28

NVD-assigned CWE(s): CWE-667 (differs from the CNA list above)

NVD / KEV / EPSS data refreshed 2026-07-28 15:55 UTC. Re-run the 🛰 Backfill from NVD button above to refresh.

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID
EUVD-2026-32792
Assigner
Linux
Published
May 28, 2026, 9:36:20 AM
Updated
Jun 14, 2026, 5:59:29 PM
EUVD base score
0.0 / 10
EUVD-reported EPSS
0.1000
Vendors
Linux
Products
Linux (patch: 6.12.88)
Linux (patch: 7.1)
Linux (bbe7bd722bfaea36aab3da6cc60fb4a05c644643 <6522d59fb7de55ce0f0f285d962243ddffebb01f)
Linux (98b726ab5e2a4811e27c28e4d041f75bba147eab <3df75fff46b1517eb479d8e6b8e3500763715dd0)
Linux (6.1.168 <6.1.175)
Linux (patch: 7.0.7)
Linux (6.12.80 <6.12.88)
Linux (patch: 6.1.175)
Linux (6.19.11 <6.20)
Linux (9d56aced21fb9c104e8a3f3be9b21fbafe448ffc <8ae6c15fc473c9ad03b0173330cce9a092c76154)
Linux (6.6.131 <6.6.140)
Linux (7.0)
Linux (patch: 0)
Linux (6931d21f87bc6d657f145798fad0bf077b82486c <366c482965c673565ecb8bcfb15d5548f13a6a10)
Linux (6.18.21 <6.18.30)
Linux (b8c56a3fc5d879c0928f207a756b0f067f06c6a8)
Linux (6931d21f87bc6d657f145798fad0bf077b82486c <aa69918bd418e700309fdd08509dba324fb24296)
Linux (patch: 6.6.140)
Linux (patch: 6.18.30)
Linux (42f0d3d81209654c08ffdde5a34b9b92d2645896 <c741433f6c8dcdecd1d9549d89053761fd1ea413)
Aliases
GHSA-gwmf-r7m2-pphm

ENISA description: 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.

EUVD references (6)

Microsoft Security Response Center MSRC

Microsoft's vendor-authoritative record from the Security Update Guide — its own CVSS score, impact, severity rating, exploit assessment, and KB-article fixes. Refreshed 2026-11-05 03:38 UTC (source: CVRF).

MS severity
Moderate
MS CVSS base score
5.5 / 10 (temporal 5.1)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U
Release
2026-May
Microsoft remediations / KB articles (2)

Affected products (2)

VendorProductVersionsPlatforms
Linux Linux 9d56aced21fb9c104e8a3f3be9b21fbafe448ffc (affected), 42f0d3d81209654c08ffdde5a34b9b92d2645896 (affected), bbe7bd722bfaea36aab3da6cc60fb4a05c644643 (affected), 98b726ab5e2a4811e27c28e4d041f75bba147eab (affected), 6931d21f87bc6d657f145798fad0bf077b82486c (affected), 6931d21f87bc6d657f145798fad0bf077b82486c (affected), b8c56a3fc5d879c0928f207a756b0f067f06c6a8 (affected), 6.1.168 (affected), 6.6.131 (affected), 6.12.80 (affected), 6.18.21 (affected), 6.19.11 (affected) —
Linux Linux 7.0 (affected), 0 (unaffected), 6.1.175 (unaffected), 6.6.140 (unaffected), 6.12.88 (unaffected), 6.18.30 (unaffected), 7.0.7 (unaffected), 7.1-rc3 (unaffected) —

Affected products — CPE 2.3 (6) NVD

NVD's normalized CPE 2.3 matchers, used by vendor tools (vulnerability scanners, asset managers) for automated detection. Compare with the CNA's free-text "Affected products" section above.

  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.0:-:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:*

Vendor references (6)

References embedded in the original CVE record by the assigning CNA.

Web references (11)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

NVD-tagged references (6)

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

Remediations (18)

Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.

  • web:cyberinsider.com

    The June 2026 fixes are available through security patch levels 2026 -06-01 and 2026 -06-05, with the latter incorporating all fixes from both patch levels. Pixel devices are expected to receive the updates first, while availability for Samsung, Motorola, Xiaomi, OnePlus, and other Android vendors will depend on each manufacturer's release schedule.

    2026-06-03 23:59 UTC
  • web:cybersecuritynews.com

    Microsoft's May 2026 Patch Tuesday lands with a heavy enterprise focus, fixing 120 vulnerabilities across Windows, Office, Azure, developer tools, and Microsoft 365 apps, including 29 remote code execution (RCE) flaws rated Critical.

    2026-06-03 23:59 UTC
  • web:msrc.microsoft.com

    The Microsoft Security Response Center (MSRC) investigates all reports of security vulnerabilities affecting Microsoft products and services, and provides the information here as part of the ongoing effort to help you manage security risks and help keep your systems protected.

    2026-06-03 23:59 UTC
  • web:source.android.com

    Security patch levels of 2025-11-01 or later address all of these issues. To learn how to check a device's security patch level, see Check and update your Android version. Within 48 hours after the initial publication of this bulletin, we will release the corresponding source code patches to the Android Open Source Project (AOSP) repository.

    2026-06-03 23:59 UTC
  • web:support.apple.com

    CVE - 2026 -43660: Cantina WebKit Available for: iPhone 11 and later, iPad Pro 12.9-inch 3rd generation and later, iPad Pro 11-inch 1st generation and later, iPad Air 3rd generation and later, iPad 8th generation and later, and iPad mini 5th generation and later Impact: Processing maliciously crafted web content may prevent Content Security Policy from being enforced Description: The issue was ...

    2026-06-03 23:59 UTC
  • web:www.lansweeper.com

    Which vulnerabilities, issues, and other things did Microsoft update? Discover what's new using Lansweeper's Patch Tuesday May 2026 summary.

    2026-06-03 23:59 UTC
  • web:www.oracle.com

    This Critical Patch Update contains 481 new security patches across the product families listed below. Please note that an MOS note summarizing the content of this Critical Patch Update and other Oracle Software Security Assurance activities is located at April 2026 Critical Patch Update: Executive Summary and Analysis.

    2026-06-03 23:59 UTC
  • web:www.proofpoint.com

    The use of the same CVE pair previously documented in TA422's campaigns is a textbook illustration of the delayed- remediation risk: once a vulnerability with reliable code execution is demonstrated in the wild, additional threat actors will adopt it opportunistically, regardless of patch availability.

    2026-06-03 23:59 UTC
  • web:www.virustotal.com

    VirusTotal is a platform for scanning files and URLs for viruses, malware, and other threats using multiple antivirus engines.

    2026-06-03 23:59 UTC
  • web:zecurit.com

    Get the complete breakdown of Microsoft's June 2026 Patch Tuesday. We analyze the latest security updates and all critical CVEs .

    2026-06-03 23:59 UTC
  • web:cybersecuritynews.com

    Microsoft has officially acknowledged a critical zero-day vulnerability in Microsoft Defender, publicly dubbed "RoguePlanet," and confirmed it is actively developing a security patch to address the flaw.

    2026-06-19 02:28 UTC
  • web:portal.msrc.microsoft.com

    The Security Update Guide provides information on the latest Microsoft security updates, helping users understand and address potential vulnerabilities effectively.

    2026-06-19 02:28 UTC
  • web:www.crowdstrike.com

    Microsoft's April 2026 Patch Tuesday addresses 164 CVEs , featuring 8 Critical vulnerabilities, one exploited zero-day, and one disclosed zero-day.

    2026-06-19 02:28 UTC
  • web:www.crowdstrike.com

    Microsoft has released security updates for 130 vulnerabilities, including 30 critical, in its May 2026 Patch Tuesday rollout.

    2026-06-19 02:28 UTC
  • web:www.linkedin.com

    Microsoft has confirmed that it is developing a security update to address a newly disclosed zero-day vulnerability in Microsoft Defender, following the public release of exploit code that ...

    2026-06-19 02:28 UTC
  • web:www.malwarebytes.com

    Microsoft says it's working on a fix for an unpatched Defender vulnerability that can give attackers the highest level of access on Windows.

    2026-06-19 02:28 UTC
  • web:www.microsoft.com

    Security Update Guide Notifications Microsoft's free Security Update Guide Notifications provide links to security-related software updates and notification of re-released security updates. These notifications are sent via email throughout the month as needed.

    2026-06-19 02:28 UTC
  • web:www.oracle.com

    This Critical Security Patch Update contains 35 new security patches across the product families listed below. Please note that an MOS note summarizing the content of this Critical Security Patch Update and other Oracle Software Security Assurance activities is located at May 2026 Critical Security Patch Update: Executive Summary and Analysis.

    2026-06-19 02:28 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-46165.json.

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/openvswitch/vport-netdev.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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            },
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              "status": "affected",
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            },
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              "status": "affected",
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            },
            {
              "lessThan": "6.12.88",
              "status": "affected",
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            },
            {
              "lessThan": "6.18.30",
              "status": "affected",
              "version": "6.18.21",
              "versionType": "semver"
            },
            {
              "lessThan": "6.20",
              "status": "affected",
              "version": "6.19.11",
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            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/openvswitch/vport-netdev.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "7.0"
            },
            {
              "lessThan": "7.0",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.175",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.140",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.88",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.30",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.7",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1-rc3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
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                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nopenvswitch: vport: fix self-deadlock on release of tunnel ports\n\nvports are used concurrently and protected by RCU, so netdev_put()\nmust happen after the RCU grace period.  So, either in an RCU call or\nafter the synchronize_net().  The rtnl_delete_link() must happen under\nRTNL and so can't be executed in RCU context.  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()->netdev_run_todo() while the RTNL itself\nis already released."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-01T16:19:22.741Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/8ae6c15fc473c9ad03b0173330cce9a092c76154"
        },
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          "url": "https://git.kernel.org/stable/c/c741433f6c8dcdecd1d9549d89053761fd1ea413"
        },
        {
          "url": "https://git.kernel.org/stable/c/6522d59fb7de55ce0f0f285d962243ddffebb01f"
        },
        {
          "url": "https://git.kernel.org/stable/c/3df75fff46b1517eb479d8e6b8e3500763715dd0"
        },
        {
          "url": "https://git.kernel.org/stable/c/366c482965c673565ecb8bcfb15d5548f13a6a10"
        },
        {
          "url": "https://git.kernel.org/stable/c/aa69918bd418e700309fdd08509dba324fb24296"
        }
      ],
      "title": "openvswitch: vport: fix self-deadlock on release of tunnel ports",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-46165",
    "datePublished": "2026-05-28T09:36:20.855Z",
    "dateReserved": "2026-05-13T15:03:33.102Z",
    "dateUpdated": "2026-06-01T16:19:22.741Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}