{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:14",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "In the Linux kernel, the following vulnerability has been resolved:  io_uring/query: cap user size passed to copy_struct_to_user  io_handle_query_entry() clamps hdr.size for the inbound copy_from_user() but keeps the original user value as usize. copy_struct_to_user() uses that usize and, when it is larger than the kernel result, clear_user()s the trailing bytes.  As hdr.size is a __u32, a query can request nearly 4 GiB of zeroing, including on the error path where res_size stays 0. The interface is reachable without a ring via IORING_REGISTER_QUERY.  Reject sizes larger than PAGE_SIZE, as recommended for copy_struct_* interfaces.",
  "id": "DEBIAN-CVE-2026-81009",
  "modified": "2026-09-12T08:47:22.270951876Z",
  "published": "2026-09-11T20:19:09.687Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-81009"
    }
  ],
  "upstream": [
    "CVE-2026-81009"
  ]
}