ovpn: fix peer refcount leak in TCP error paths

{
  "id": "318e3a5a06ac9c320bdf53c0601674729c874e5543fd660ce8280b143f1317c8",
  "url": "https://osv.dev/vulnerability/CVE-2026-68122",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "ovpn: fix peer refcount leak in TCP error paths",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: ovpn: fix peer refcount leak in TCP error paths When either the TCP RX or TX error path calls ovpn_peer_hold() followed by schedule_work(&peer->tcp.defer_del_work), and the work item is already pending from the other path, schedule_work() returns false and the work runs only once. Since ovpn_tcp_peer_del_work() calls ovpn_peer_put() exactly once, the extra reference taken by the losing path is never dropped, leaking the peer object. The race window: CPU0 (strparser/RX error): CPU1 (tcp_tx_work/TX error): ovpn_peer_hold() <- refcnt+1 ovpn_peer_hold() <- refcnt+2 schedule_work() <- queued schedule_work() <- NO-OP (work already pending) ovpn_tcp_peer_del_work runs: ovpn_peer_del() ovpn_peer_put() <- refcnt+1 <- peer never freed Fix by checking the return value of schedule_work() in both paths and calling ovpn_peer_put() to drop the extra reference if the work was already pending. ovpn_peer_hold() is kept unconditional in the TX path as it cannot fail at that point.",
    "evidence": "osv:CVE-2026-68122",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.18.42",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.1.6",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-68122",
      "aliases": [
        "CVE-2026-68122"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "a6a5e87b3ee4cbf9c69a776565378c9b6a91dbfb"
                },
                {
                  "fixed": "b08526bf0bbf84ceebd29033783e8e0c9f451286"
                },
                {
                  "fixed": "f08f39c1f43f3980d46b06af8ed99ffe84ac294a"
                },
                {
                  "fixed": "63bbe18fc03062f483c627838a566a707b62da79"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-68122.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.16.0"
                },
                {
                  "fixed": "6.18.42"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.1.6"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-68122.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:45.231573595Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/63bbe18fc03062f483c627838a566a707b62da79",
        "https://git.kernel.org/stable/c/b08526bf0bbf84ceebd29033783e8e0c9f451286",
        "https://git.kernel.org/stable/c/f08f39c1f43f3980d46b06af8ed99ffe84ac294a",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68122.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-68122",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68122.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-68122",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 513379,
  "published_at": "2026-08-10T11:58:42.477+00:00"
}