{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-46015",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-46015"
  ],
  "published": "2026-05-27T12:59:23Z",
  "summary": "tcp: call sk_data_ready() after listener migration",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ntcp: call sk_data_ready() after listener migration\n\nWhen inet_csk_listen_stop() migrates an established child socket from\na closing listener to another socket in the same SO_REUSEPORT group,\nthe target listener gets a new accept-queue entry via\ninet_csk_reqsk_queue_add(), but that path never notifies the target\nlistener's waiters. A nonblocking accept() still works because it\nchecks the queue directly, but poll()/epoll_wait() waiters and\nblocking accept() callers can also remain asleep indefinitely.\n\nCall READ_ONCE(nsk->sk_data_ready)(nsk) after a successful migration\nin inet_csk_listen_stop().\n\nHowever, after inet_csk_reqsk_queue_add() succeeds, the ref acquired\nin reuseport_migrate_sock() is effectively transferred to\nnreq->rsk_listener. Another CPU can then dequeue nreq via accept()\nor listener shutdown, hit reqsk_put(), and drop that listener ref.\nSince listeners are SOCK_RCU_FREE, wrap the post-queue_add()\ndereferences of nsk in rcu_read_lock()/rcu_read_unlock(), which also\ncovers the existing sock_net(nsk) access in that path.\n\nThe reqsk_timer_handler() path does not need the same changes for two\nreasons: half-open requests become readable only after the final ACK,\nwhere tcp_child_process() already wakes the listener; and once nreq is\nvisible via inet_ehash_insert(), the success path no longer touches\nnsk directly.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-46015"
    },
    {
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      "url": "https://git.kernel.org/stable/c/7aa7933a5607b1e5b56f322d17265c1d0ea02c51"
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    "upstream_modified": "2026-08-05T13:16:28Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The bug is reached only through local socket lifecycle operations \u2014 creating an SO_REUSEPORT group, enabling migration, and closing the source listener while accepting/closing the target. A remote peer cannot set up the migration group or drive the race, so the vector is Local.\nAC:L - The attacker controls both sides of the race (the closing listener via inet_csk_listen_stop and the concurrent accept/close that drops the listener's last ref), and the missed-wakeup half is deterministic; per guidance an attacker-created race is Low.\nPR:L - Migration must be enabled, requiring CAP_NET_ADMIN to set the per-netns net.ipv4.tcp_migrate_req sysctl (or a SK_REUSEPORT/migrate BPF prog), all of which an unprivileged user obtains in a user namespace via unshare -Urn.\nUI:N - Triggering depends only on the attacker's own socket operations; no action by any other user is required.\nS:U - The use-after-free and its impact are confined to the kernel's own memory/security authority with no crossing of a VM, IOMMU, or sandbox boundary.\nC:H - Use-after-free of a SOCK_RCU_FREE listener socket lets reallocated/freed memory be read (e.g., via sock_net(nsk)), enabling kernel information disclosure.\nI:H - The freed socket is dereferenced for sock_net(nsk) in __NET_INC_STATS (a pointer-controlled increment) and sk_data_ready(nsk) (a function-pointer call), giving an attacker-influenced write/control-flow primitive after heap grooming.\nA:H - The use-after-free reliably crashes the kernel, and the always-present missed wakeup hangs a listener's accept/poll/epoll waiters indefinitely."
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}