{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-81010",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-81010"
  ],
  "published": "2026-09-11T19:47:07Z",
  "summary": "io_uring/waitid: honor task_work cancellation",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring/waitid: honor task_work cancellation\n\nio_waitid_cb() may run through the fallback task_work path when\ntask_work_add() can no longer queue work to the originating task. The\nfallback runs from a kworker and io_uring marks such task work as\ncanceled through tw.cancel.\n\nio_waitid_cb() currently ignores tw.cancel and calls __do_wait().\nwaitid is task-context dependent: __do_wait() performs child lookup\nrelative to current, and the retry path also uses\ncurrent->signal->wait_chldexit. If the callback runs from the fallback\nkworker, current is therefore not the task that submitted the request.\n\nHonor tw.cancel before entering __do_wait(). Complete the request with\n-ECANCELED and skip the siginfo copy, since canceled task work may run\nwithout the submitting task's userspace execution context.\n\nKeep the existing siginfo handling for normal waitid completion and\nexplicit cancellation.",
  "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-2026-81010"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/0879697520abda2383ed7be40572ad583b5c4b02"
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      "url": "https://git.kernel.org/stable/c/7bc98e2de8c58a2bfaf0f540eb096a386ecfc96c"
    },
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      "url": "https://git.kernel.org/stable/c/14572de82e5022899e5856008bc9cac97004a88c"
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  "database_specific": {
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    "upstream_modified": "2026-09-14T12:06:03Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The bug is reached by submitting IORING_OP_WAITID via io_uring_setup/io_uring_enter, then forcing canceled task_work by closing the ring or exiting the submitting task. Per kernel scoring guidance, io_uring bugs are Local.\nAC:L - The attacker controls the full sequence: create a DEFER_TASKRUN ring, submit WAITID, fork/signal children so io_waitid_wait queues io_waitid_cb, then close the ring so io_ring_exit_work runs that callback from a kworker with tw.cancel set. No uninfluenced race or rare config is required.\nPR:L - Unprivileged users can create an io_uring ring (sysctl_io_uring_disabled defaults to 0) and IORING_OP_WAITID has no capability check; waiting on one's own children needs no privilege. User namespaces or init-namespace root are not required.\nUI:N - The attacker performs every step in their own process (ring setup, WAITID submission, child fork/signal, and ring close or exit). No other user must act.\nS:U - Wrong-context waitid completion and the resulting kernel memory corruption stay within the host kernel's security authority. This is standard local privilege-escalation/DoS impact, not a VM, IOMMU, or sandbox boundary crossing.\nC:H - Ignoring tw.cancel lets io_waitid_cb run __do_wait and unsafe_put_user of siginfo from a PF_KTHREAD fallback worker whose lazy-TLB CR3 may be another mm, including one concurrently torn down by exit_mmap, yielding memory corruption over reused pages/page tables that can be leveraged for kernel disclosure.\nI:H - The same kworker path writes siginfo fields through unsafe_put_user to an attacker-chosen userspace address without the submitter's mm, and the -ERESTARTSYS retry can add a wait-queue entry on the kworker's wait_chldexit. Wrong-mm writes and wait-queue corruption are High-integrity primitives.\nA:H - Userspace access against a missing or tearing-down mm, and wait-queue manipulation on the wrong task, produce kernel faults, oopses, and panics; the unexploited fallback path can also crash or hang ring-teardown. Any kernel crash is High availability."
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}