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  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68117.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ntipc: clear sock-\u003esk on the failed-insert path in tipc_sk_create()\n\nWhen tipc_sk_create() fails to insert the new socket (tipc_sk_insert()\nreturns non-zero), its error path frees the sk with sk_free() but leaves\nsock-\u003esk pointing at the freed object:\n\n\tif (tipc_sk_insert(tsk)) {\n\t\tsk_free(sk);\n\t\tpr_warn(\"Socket create failed; port number exhausted\\n\");\n\t\treturn -EINVAL;\n\t}\n\nThis is harmless for plain socket(): the syscall layer clears sock-\u003eops\nbefore releasing, so tipc_release() is never called. It is not harmless\non the accept() path. tipc_accept() creates the pre-allocated child\nsocket with tipc_sk_create(net, new_sock, 0, kern); on failure it leaves\nnew_sock-\u003esk dangling and new_sock-\u003eops non-NULL, and do_accept() then\nfput()s the new file, so __sock_release() -\u003e tipc_release() runs\nlock_sock(new_sock-\u003esk) on the freed sk -- a use-after-free write of the\nsk_lock spinlock.\n\ntipc_release() already guards this exact \"failed accept() releases a\npre-allocated child\" case with \"if (sk == NULL) return 0;\", but the\nguard is bypassed because tipc_sk_create() left sock-\u003esk non-NULL\n(dangling) rather than NULL.\n\nClear sock-\u003esk on the failed-insert path so the existing tipc_release()\nNULL check fires and the use-after-free is avoided.\n\nThe tipc_sk_insert() failure is reached when the per-netns socket\nrhashtable hits its max_size (tsk_rht_params.max_size = 1048576, ~2M\nelements) -- i.e. once a netns holds ~2M TIPC sockets every insert\nreturns -E2BIG.\n\n  BUG: KASAN: slab-use-after-free in lock_sock_nested (net/core/sock.c:3839)\n  Write of size 8 at addr ffff8880047cdc38 by task init/1\n   lock_sock_nested (net/core/sock.c:3839)\n   tipc_release (net/tipc/socket.c:638)\n   __sock_release (net/socket.c:710)\n   sock_close (net/socket.c:1501)\n   __fput (fs/file_table.c:512)\n  Allocated by task 1:\n   sk_alloc (net/core/sock.c:2308)\n   tipc_sk_create (net/tipc/socket.c:487)\n   tipc_accept (net/tipc/socket.c:2744)\n   do_accept (net/socket.c:2034)\n  Freed by task 1:\n   __sk_destruct (net/core/sock.c:2391)\n   tipc_sk_create (net/tipc/socket.c:504)\n   tipc_accept (net/tipc/socket.c:2744)\n   do_accept (net/socket.c:2034)",
  "id": "CVE-2026-68117",
  "modified": "2026-08-21T03:30:15.832987618Z",
  "published": "2026-08-10T11:58:36.675Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5f5a41a48dbf9eda57b67ce23e548602cf7195a6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/82f59aa27f33bd014a7d8739371ab5712d15e33b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8d6f26d48e61ef34f1921289401dbf36b10816af"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b07d87b31631edb6529e6cdcca790a7489d1250d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ba0533fc163f905fe817cfabdf8ed4058da44800"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/dd29891ed840f6b8d020b759d0dc4a00b1d6e4ea"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/efebc23e9b29e3e5a9e2127dd066929f7f0d315e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f9596b1566616a8be0592dbceccb6344a7c6f6bb"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68117.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-68117"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "tipc: clear sock-\u003esk on the failed-insert path in tipc_sk_create()"
}