{
  "cveId": "CVE-2026-99229",
  "url": "https://patchblox.com/security/cve/CVE-2026-99229",
  "summary": "CVE-2026-99229 is fixed in linux on 1 platform, first by DEBIAN-CVE-2026-99229, released November 3, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "io_uring/wait: don\u0027t spin on a stuck overflow list",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  io_uring/wait: don\u0027t spin on a stuck overflow list  As long as IO_CHECK_CQ_OVERFLOW_BIT is set, io_cqring_wait_schedule() returns right away, before it gets to look at signals or arms the timeout, for io_cqring_wait() to flush the overflow list. If that doesn\u0027t empty the list, and the CQ ring doesn\u0027t hold the number of events the caller wants, the loop starts over, with the same result. The task spins in the kernel, and can\u0027t be killed.  The assumption is that this can\u0027t happen: if CQEs can\u0027t be flushed, the ring is full, and min_events is capped to the size of the ring. But:  - With IORING_SETUP_CQE_MIXED a 32b CQE needs two contiguous entries. It   is stuck on the list if a single one is free, and then the ring holds   less than cq_entries events. A single threaded application that asks   for as many events as the ring has entries never gets out of   io_uring_enter().  - Whether the ring is full is up to the CQ head, which the application   can write to. While one thread waits for events on an empty ring,   another one can move the head back so that the ring looks full and   have a CQE overflow. The waiter can\u0027t be stopped any more, not even by   SIGKILL.  Only the application can make room in the CQ ring. Return to it if the list could not be flushed.",
  "published": "2026-11-02T16:17:47Z",
  "severity": "Moderate",
  "cvss": 5.5,
  "epss": 0.00161,
  "epssPercentile": 0.05322,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-99229",
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.12.115-1",
      "fix": "DEBIAN-CVE-2026-99229",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-99229",
      "released": "2026-11-03T18:58:21Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.2.14-1",
      "fix": "DEBIAN-CVE-2026-99229",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-99229",
      "released": "2026-11-03T18:58:21Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}