Vulnerability-Lookup

GHSA-X9M6-8J85-QVQG

Vulnerability from github – Published: 2026-04-25 09:30 – Updated: 2026-04-27 15:30

Details

In the Linux kernel, the following vulnerability has been resolved:

openvswitch: defer tunnel netdev_put to RCU release

ovs_netdev_tunnel_destroy() may run after NETDEV_UNREGISTER already detached the device. Dropping the netdev reference in destroy can race with concurrent readers that still observe vport->dev.

Do not release vport->dev in ovs_netdev_tunnel_destroy(). Instead, let vport_netdev_free() drop the reference from the RCU callback, matching the non-tunnel destroy path and avoiding additional synchronization under RTNL.

Severity ?

7.8 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-31678"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-367"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-04-25T09:16:01Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nopenvswitch: defer tunnel netdev_put to RCU release\n\novs_netdev_tunnel_destroy() may run after NETDEV_UNREGISTER already\ndetached the device. Dropping the netdev reference in destroy can race\nwith concurrent readers that still observe vport-\u003edev.\n\nDo not release vport-\u003edev in ovs_netdev_tunnel_destroy(). Instead, let\nvport_netdev_free() drop the reference from the RCU callback, matching\nthe non-tunnel destroy path and avoiding additional synchronization\nunder RTNL.",
  "id": "GHSA-x9m6-8j85-qvqg",
  "modified": "2026-04-27T15:30:51Z",
  "published": "2026-04-25T09:30:28Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31678"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/42f0d3d81209654c08ffdde5a34b9b92d2645896"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6931d21f87bc6d657f145798fad0bf077b82486c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/98b726ab5e2a4811e27c28e4d041f75bba147eab"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9d56aced21fb9c104e8a3f3be9b21fbafe448ffc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b8c56a3fc5d879c0928f207a756b0f067f06c6a8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bbe7bd722bfaea36aab3da6cc60fb4a05c644643"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-31678 (GCVE-0-2026-31678)

Vulnerability from cvelistv5 – Published: 2026-04-25 08:46 – Updated: 2026-04-27 14:04

Title

openvswitch: defer tunnel netdev_put to RCU release

Summary

In the Linux kernel, the following vulnerability has been resolved: openvswitch: defer tunnel netdev_put to RCU release ovs_netdev_tunnel_destroy() may run after NETDEV_UNREGISTER already detached the device. Dropping the netdev reference in destroy can race with concurrent readers that still observe vport->dev. Do not release vport->dev in ovs_netdev_tunnel_destroy(). Instead, let vport_netdev_free() drop the reference from the RCU callback, matching the non-tunnel destroy path and avoiding additional synchronization under RTNL.

Severity ?

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/9d56aced21fb9c104…
	https://git.kernel.org/stable/c/42f0d3d81209654c0…
	https://git.kernel.org/stable/c/bbe7bd722bfaea36a…
	https://git.kernel.org/stable/c/98b726ab5e2a4811e…
	https://git.kernel.org/stable/c/b8c56a3fc5d879c09…
	https://git.kernel.org/stable/c/6931d21f87bc6d657…

Impacted products

Vendor

Product

Version

Linux

Affected: a9020fde67a6eb77f8130feff633189f99264db1 , < 9d56aced21fb9c104e8a3f3be9b21fbafe448ffc (git)
Affected: a9020fde67a6eb77f8130feff633189f99264db1 , < 42f0d3d81209654c08ffdde5a34b9b92d2645896 (git)
Affected: a9020fde67a6eb77f8130feff633189f99264db1 , < bbe7bd722bfaea36aab3da6cc60fb4a05c644643 (git)
Affected: a9020fde67a6eb77f8130feff633189f99264db1 , < 98b726ab5e2a4811e27c28e4d041f75bba147eab (git)
Affected: a9020fde67a6eb77f8130feff633189f99264db1 , < b8c56a3fc5d879c0928f207a756b0f067f06c6a8 (git)
Affected: a9020fde67a6eb77f8130feff633189f99264db1 , < 6931d21f87bc6d657f145798fad0bf077b82486c (git)

Linux

Affected: 4.3
Unaffected: 0 , < 4.3 (semver)
Unaffected: 6.1.168 , ≤ 6.1.* (semver)
Unaffected: 6.6.131 , ≤ 6.6.* (semver)
Unaffected: 6.12.80 , ≤ 6.12.* (semver)
Unaffected: 6.18.21 , ≤ 6.18.* (semver)
Unaffected: 6.19.11 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)

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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/openvswitch/vport-netdev.c"
          ],
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          "vendor": "Linux",
          "versions": [
            {
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            }
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              "version": "0",
              "versionType": "semver"
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              "status": "unaffected",
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              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.6.131",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.12.80",
              "versionType": "semver"
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              "status": "unaffected",
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              "versionType": "semver"
            },
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              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
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        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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        }
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        {
          "url": "https://git.kernel.org/stable/c/6931d21f87bc6d657f145798fad0bf077b82486c"
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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.

Action not permitted

GHSA-X9M6-8J85-QVQG

CVE-2026-31678 (GCVE-0-2026-31678)

Tags

Sightings

Nomenclature