CVE-2026-64043 (GCVE-0-2026-64043)
Vulnerability from cvelistv5
Published
2026-07-19 15:39
Modified
2026-07-19 15:39
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: ovpn: fix race between deleting interface and adding new peer While deleting an existing ovpn interface, there is a very narrow window where adding a new peer via netlink may cause the netdevice to hang and prevent its unregistration. It may happen during ovpn_dellink(), when all existing peers are freed and the device is queued for deregistration, but a CMD_PEER_NEW message comes in adding a new peer that takes again a reference to the netdev. At this point there is no way to release the device because we are under the assumption that all peers were already released. Fix the race condition by releasing all peers in ndo_uninit(), when the netdevice has already been removed from the netdev list. Also ovpn_peer_add() has now an extra check that forces the function to bail out if the device reg_state is not REGISTERED. This way any incoming CMD_PEER_NEW racing with the interface deletion routine will simply stop before adding the peer. Note that the above check happens while holding the netdev_lock to prevent racing netdev state changes. ovpn_dellink() is now empty and can be removed.
References
Impacted products
Vendor Product Version
Linux Linux Version: 80747caef33d77f5c1b3d24644e6d7dae69066b5
Version: 80747caef33d77f5c1b3d24644e6d7dae69066b5
Version: 80747caef33d77f5c1b3d24644e6d7dae69066b5
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ovpn/main.c",
            "drivers/net/ovpn/peer.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "097d62df38314c14b88fab9096f3461baf158e2b",
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        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ovpn/main.c",
            "drivers/net/ovpn/peer.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.16"
            },
            {
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.34",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
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              "version": "7.0.11",
              "versionType": "semver"
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          "nodes": [
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                  "versionEndExcluding": "6.18.34",
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                  "vulnerable": true
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                  "vulnerable": true
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                  "versionEndExcluding": "7.1",
                  "versionStartIncluding": "6.16",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\novpn: fix race between deleting interface and adding new peer\n\nWhile deleting an existing ovpn interface, there is a very\nnarrow window where adding a new peer via netlink may cause\nthe netdevice to hang and prevent its unregistration.\n\nIt may happen during ovpn_dellink(), when all existing peers are\nfreed and the device is queued for deregistration, but a\nCMD_PEER_NEW message comes in adding a new peer that takes again\na reference to the netdev.\n\nAt this point there is no way to release the device because we are\nunder the assumption that all peers were already released.\n\nFix the race condition by releasing all peers in ndo_uninit(),\nwhen the netdevice has already been removed from the netdev\nlist.\n\nAlso ovpn_peer_add() has now an extra check that forces the\nfunction to bail out if the device reg_state is not REGISTERED.\nThis way any incoming CMD_PEER_NEW racing with the interface\ndeletion routine will simply stop before adding the peer.\n\nNote that the above check happens while holding the netdev_lock\nto prevent racing netdev state changes.\n\novpn_dellink() is now empty and can be removed."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-19T15:39:29.225Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/097d62df38314c14b88fab9096f3461baf158e2b"
        },
        {
          "url": "https://git.kernel.org/stable/c/de9fec2a6645f5b4d23398cd870a33e2703728d9"
        },
        {
          "url": "https://git.kernel.org/stable/c/982422b11e6f95f766a8cd2c2b1cbdb77e234a61"
        }
      ],
      "title": "ovpn: fix race between deleting interface and adding new peer",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64043",
    "datePublished": "2026-07-19T15:39:29.225Z",
    "dateReserved": "2026-07-19T07:54:57.029Z",
    "dateUpdated": "2026-07-19T15:39:29.225Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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