{
  "schemaVersion": 1,
  "attribution": [
    {
      "source": "CISA Known Exploited Vulnerabilities",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "licence": "US government work"
    },
    {
      "source": "GitHub Advisory Database",
      "url": "https://github.com/advisories",
      "licence": "CC BY 4.0"
    },
    {
      "source": "Have I Been Pwned",
      "url": "https://haveibeenpwned.com/",
      "licence": "CC BY 4.0"
    },
    {
      "source": "CVE Program (CVE records)",
      "url": "https://www.cve.org/Legal/TermsOfUse",
      "licence": "CVE Terms of Use",
      "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.",
      "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss/",
      "licence": "free to use; FIRST requests attribution"
    }
  ],
  "record": {
    "id": "CVE-2026-64044",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-64044",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-07-19T15:39:29.869Z",
    "updatedAt": "2026-08-05T12:38:36.035Z",
    "importedAt": "2026-10-24T01:58:25.636Z",
    "snapshot": {
      "id": "cve_2026-10-24_midnight_baseline",
      "at": "2026-10-24T00:00:00.000Z",
      "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z"
    },
    "facts": {
      "title": "ovpn: respect peer refcount in CMD_NEW_PEER error path",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\novpn: respect peer refcount in CMD_NEW_PEER error path\n\novpn_nl_peer_new_doit()'s error path calls ovpn_peer_release() directly\nrather than ovpn_peer_put(), bypassing the kref. The accompanying\ncomment (\"peer was not yet hashed, thus it is not used in any context\")\nholds for UDP but not for TCP.\n\nFor UDP, the ovpn_socket union uses the .ovpn arm and never points back\nat a peer; UDP encap_recv looks up peers via the not-yet-populated\nhashtables, so the new peer is unreachable until ovpn_peer_add()\npublishes it.\n\nFor TCP, ovpn_socket_new() sets ovpn_sock->peer and\novpn_tcp_socket_attach() publishes ovpn_sock via rcu_assign_sk_user_data().\nFrom that moment until ovpn_socket_release() detaches in the error path,\nthe TCP fd is fully wired: userspace recvmsg / sendmsg / close / poll\non the fd, as well as the strparser-driven ovpn_tcp_rcv() path, can\nreach the peer through sk_user_data -> ovpn_sock->peer and bump its\nrefcount via ovpn_peer_hold().\n\novpn_tcp_socket_wait_finish() (called inside ovpn_socket_release())\ndrains strparser and the tx work, but does not synchronize with\nuserspace syscall callers that already hold a peer reference. If\novpn_nl_peer_modify() or ovpn_peer_add() returns an error while such\na caller is in flight - notably an ovpn_tcp_recvmsg() blocked in\n__skb_recv_datagram() on peer->tcp.user_queue - the direct\novpn_peer_release() destroys the peer while the caller still holds\nthe reference, and the eventual ovpn_peer_put() from that caller\noperates on freed memory.\n\nReplace the direct destructor call with ovpn_peer_put() so the kref\ncorrectly defers destruction until the last reference is dropped.\nIn the common case where no concurrent user is present, behaviour is\nunchanged: the kref hits zero immediately and ovpn_peer_release_kref()\nruns the same destructor.\n\nWith this conversion ovpn_peer_release() has no callers outside peer.c\n- ovpn_peer_release_kref() in the same translation unit is the only\nremaining user - so make it static and drop its declaration from\npeer.h.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "11851cbd60ea1e5abbd97619d69845ead99303d6",
              "status": "affected",
              "versionType": "git",
              "lessThan": "8298834912d76dbc82c12b6b4ab7590ed2bb8ae5"
            },
            {
              "version": "11851cbd60ea1e5abbd97619d69845ead99303d6",
              "status": "affected",
              "versionType": "git",
              "lessThan": "0c3ef71879c0264de6c42463031d9e057da87840"
            },
            {
              "version": "11851cbd60ea1e5abbd97619d69845ead99303d6",
              "status": "affected",
              "versionType": "git",
              "lessThan": "1fef6614673ff0846d30acdeeaf3cf98bb5f6116"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "6.16",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "6.16"
            },
            {
              "version": "6.18.34",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "version": "7.0.11",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "7.0.*"
            },
            {
              "version": "7.1",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}