{
  "cveId": "CVE-2026-99243",
  "url": "https://patchblox.com/security/cve/CVE-2026-99243",
  "summary": "CVE-2026-99243 is fixed in linux on 1 platform by DEBIAN-CVE-2026-99243 (version 6.12.115-1), released November 3, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "io-wq: order the exit bit against worker creation task work",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  io-wq: order the exit bit against worker creation task work  io_wq_exit_workers() cancels task work for queued worker creation with task_work_cancel_match(). That has a plain load of task-\u003Etask_works.  io_queue_worker_create() adds the new entry and tests IO_WQ_BIT_EXIT to cancel it if the workqueue is already on its way out.  That must be ordered. task_work_add() has a full barrier via cmpxchg(). But io_wq_exit_start() sets the bit with set_bit() which doesn\u0027t have any memory ordering.  So afaict, on weakly ordered architectures the exiting task may load task_works before the store of the bit is visible. The other side tests the bit before the store is visible as well. So the entry remains queued with worker_refs and the exiting task waits on worker_done indefinitely.  If the task still has rings then io_uring_del_tctx_node() provides the barrier via test_and_set_bit() in io_wq_set_exit_on_idle(). When it has closed all rings though that barrier is gone.  Add the barrier after the set_bit().",
  "published": "2026-11-03T12:17:30Z",
  "severity": "Moderate",
  "cvss": 4.7,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-99243",
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.12.115-1",
      "fix": "DEBIAN-CVE-2026-99243",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-99243",
      "released": "2026-11-03T18:58:21Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T00:53:09Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}