{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:14",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "7.1.5-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "In the Linux kernel, the following vulnerability has been resolved:  io_uring/bpf-ops: reject re-registration of an already-bound ops  io_install_bpf() only rejects a second registration on the ctx side (ctx-\u003ebpf_ops) and sets the per-map back-pointer ops-\u003epriv unconditionally. The struct_ops link path never advances a map past BPF_STRUCT_OPS_STATE_READY, so the same io_uring_bpf_ops map can be registered more than once, and bpf_io_reg() re-resolves the target ring via fget(ops-\u003ering_fd) on every call. A caller can therefore point the same ring_fd at a different io_ring_ctx between two BPF_LINK_CREATE calls.  The second registration passes the ctx-\u003ebpf_ops check (the new ctx has none) and overwrites ops-\u003epriv, orphaning the first ctx. Teardown (io_eject_bpf()/bpf_io_unreg()) only reaches a ctx through ops-\u003epriv, so the orphaned ctx is never torn down: its ctx-\u003eloop_step keeps pointing into the struct_ops trampoline, which is freed once the map is gone. A later io_uring_enter() on the orphaned ring then calls the dangling ctx-\u003eloop_step from io_run_loop() -- a use-after-free of freed executable memory, reachable by a task with CAP_BPF + CAP_PERFMON.  Reject registration when ops-\u003epriv is already set, as hid_bpf_reg() does for its struct_ops.",
  "id": "DEBIAN-CVE-2026-72112",
  "modified": "2026-09-14T16:47:34.510931760Z",
  "published": "2026-08-15T06:21:25.563Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-72112"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "upstream": [
    "CVE-2026-72112"
  ]
}