{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-93826",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-93826"
  ],
  "published": "2026-09-24T16:08:25Z",
  "summary": "HID: hidpp: fix potential UAF in hidpp_connect_event()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nHID: hidpp: fix potential UAF in hidpp_connect_event()\n\nIf input_register_device() fails, we call input_free_device(), but keep\nstale pointer to the old device in hidpp->input, which could potentially\nlead to UAF. Fix that by resetting it to NULL before returning from\nhidpp_connect_event().",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:A/AC:H/PR:N/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-2026-93826"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e03fd646adad7f97fa4429ec5f38cee9bde5276e"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5d7637f4d050d105177217e64b869f56f9825060"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3b8b2e58b078cd30e121401535541bb8a6d57133"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3303398cc2aa255ba251650a30024e11d48ea6c3"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6df6b1f2c49678211f65647c300bc51dda02893b"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-10-03T11:04:09Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.5,
      "cvss_v3_severity": "High",
      "scenario": "AV:A - The UAF is in hidpp_connect_event(), reached from hidpp_probe() and from hidpp_raw_hidpp_event() on a HID++ short report with rap.sub_id 0x41. DELAYED_INIT devices are Unifying DJ children (PIDs 0x4011/0x4101/0x402d via logi_dj_recv_add_djhid_device) and Bluetooth T651, so the trigger arrives over Unifying 2.4 GHz or Bluetooth HIDP.\nAC:H - The dangling hidpp->input is created only when hidpp_populate_input() stores the new device and input_register_device() then fails, so hidpp_connect_event() calls input_free_device() without clearing the pointer. That register fails on GFP_KERNEL ENOMEM (devres_alloc/input_device_tune_vals), device_add(), or -EINTR on input_mutex, which a HID++ peer cannot induce on demand.\nPR:N - logi_dj_raw_event() delivers Unifying pairing/connect notifications and HID++ reports to the child with no host credential check, and hidpp_probe() binds logitech-hidpp-device during that enumeration; Bluetooth T651 HIDP bind is likewise unauthenticated. No OS account or capability is required.\nUI:N - A REPORT_TYPE_NOTIF_DEVICE_PAIRED/CONNECTED notification (or T651 HIDP connect) runs hidpp_probe() which schedules hidpp_connect_event(); after the failed register, later HID reports handled by wtp_raw_event()/m560_raw_event() dereference hidpp->input. The attacker's peripheral generates both without a victim mount, click, or prompt.\nS:U - The freed object is the delayed struct input_dev allocated by hidpp_allocate_input() and stored in hidpp->input; the UAF stays inside the host kernel HID/input authority and does not cross a VM, IOMMU, or sandbox boundary.\nC:H - After input_free_device(), wtp_raw_event()/m560_raw_event() still see a non-NULL hidpp->input and call input_mt_get_slot_by_key()/input_event()/input_sync() on the freed input_dev (vals, absinfo, mt slots). UAF of that heap object is an arbitrary-read primitive once the slab is reused.\nI:H - The same dangling hidpp->input is used for input_mt_slot(), input_report_key/rel(), and input_sync(), which write event state and walk handlers on the freed input_dev; heap spray of that object yields arbitrary kernel writes and control-flow hijack.\nA:H - Dereferencing the freed input_dev in wtp_touch_event()/m560_raw_event() after hidpp_connect_event()'s input_free_device() oopses or panics when the object is not reused; hidpp_probe() still succeeds, and DJ's no-op logi_dj_ll_close() keeps delivering reports that retrigger the crash."
    }
  }
}