{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-99218",
  "modified": "2026-11-03T05:30:01Z",
  "upstream": [
    "CVE-2026-99218"
  ],
  "published": "2026-11-02T15:14:24Z",
  "summary": "coredump: hold RCU while releasing parked threads",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncoredump: hold RCU while releasing parked threads\n\ncoredump_finish() releases the parked threads by clearing ->task in\ntheir core_thread entry and calling wake_up_process() on each of them.\nIt does that without holding a reference on the task and without being\ninside rcu.\n\nBut calling wake_up_process(task) without rcu here isn't safe. A parked\nthread doesn't need that wakeup to leave. A spurious wakeup or a\npreemption after the store is enough for the task to go away.\n\nSo if the coredump client is preempted between the store and\nwake_up_process() the thread can exit and be freed in the meantime and\ntry_to_wake_up() takes pi_lock in freed memory.\n\nHold rcu across the loop.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:H/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-2026-99218"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/fd0fbe84312fda2fc187428c92c50b7d03a9d24c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/71146c437bae59e5280f657965dc6d006ee3989b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/0fce73efee40c65ce26641c5d93942462f9e8307"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/16e94ed90b1b02398e044d41fd1db34828daa08e"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a0f09ff4c6b93312e565cfe75d76c3a551a3ec4c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b0eca0edddf4c1dbaf6d1f6a8636b4235f5bc573"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-11-02T16:03:24Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.0,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The UAF is in coredump_finish(), reached when a local dump signal is delivered via get_signal() -> vfs_coredump() -> do_coredump()/coredump_cleanup(). abort(), a user page-fault SIGSEGV, or tgkill() on the attacker's own thread group starts that path; no remote protocol supplies the curr->task pointer later handed to wake_up_process().\nAC:H - coredump_wait() parks siblings in coredump_task_exit() in TASK_IDLE (no TASK_WAKEKILL), so kill/tgkill cannot wake them. The UAF needs the dumper preempted between curr->task=NULL and wake_up_process() long enough for a spurious or freezer wakeup, full do_exit(), and an RCU GP via delayed_put_task_struct() \u2014 timing the attacker cannot force.\nPR:L - get_signal() dumps the caller's own dumpable thread group with no capability check. An ordinary user pthread_create()s a sibling and abort()s or faults into vfs_coredump(); coredump_skip() only bails on TASK_DUMPABLE_OFF, which a normal user process is not.\nUI:N - The attacker creates the extra thread and delivers the dump signal inside their own process; no other user must mount media, open a file, or otherwise act.\nS:U - try_to_wake_up() on the freed task_struct corrupts host kernel scheduler state inside the same kernel; this is ordinary in-kernel UAF impact, not a VM, IOMMU, or sandbox escape.\nC:H - wake_up_process() -> try_to_wake_up() reads __state, on_rq, and sched_class from the task_struct after delayed_put_task_struct() has freed it; a sprayable slab UAF read is High confidentiality per UAF guidance.\nI:H - try_to_wake_up() takes raw_spin_lock on the freed p->pi_lock, writes __state, and calls p->sched_class->enqueue_task(); reclaiming the task_struct slab yields a write and control-flow primitive.\nA:H - Taking pi_lock in memory already freed by delayed_put_task_struct(), as the fix describes, oopses or panics even without a successful spray, so availability is High."
    }
  }
}