{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-80780",
  "modified": "2026-10-07T14:35:31Z",
  "upstream": [
    "CVE-2026-80780"
  ],
  "published": "2026-09-04T15:14:07Z",
  "summary": "HID: pidff: fix OOB write when hid->inputs is empty",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nHID: pidff: fix OOB write when hid->inputs is empty\n\nhid_pidff_init_with_quirks() derives its input_dev from\n\n\tlist_entry(hid->inputs.next, struct hid_input, list)\n\nwithout first checking that hid->inputs is non-empty.  The list member\nof struct hid_input is at offset 0, so on an empty list list_entry()\nyields &hid->inputs itself and the following hidinput->input load reads\nan unrelated member of struct hid_device.  dev is then a type-confused\npointer, and force-feedback init writes through it: each\nset_bit(FF_*, dev->ffbit) stores 8 bytes at dev + 192, past the end of\nthe object dev actually aliases, and input_ff_create() adds further\nwrites of a heap pointer and two function pointers.\n\nUntil hid-universal-pidff the only caller was hid_pidff_init() from\nusbhid, which runs under HID_CLAIMED_INPUT and therefore always has at\nleast one hid_input.  universal_pidff_probe() starts the device with\nHID_CONNECT_DEFAULT & ~HID_CONNECT_FF and then calls\nhid_pidff_init_with_quirks() directly whenever the descriptor carries a\nPID usage page, bypassing that gate.  A report descriptor whose only\napplication collection is on HID_UP_PID leaves hid->inputs empty while\nhid_connect() still succeeds through the hidraw claim, so probe reaches\nthe unguarded list_entry().\n\nThe write happens in the USB probe path, on the hotplug workqueue, so\nplugging in a malicious device is enough to trigger it; no attacker\nsoftware and no logged-in user are required.  KASAN reports an 8-byte\nout-of-bounds write in hid_pidff_init_with_quirks() reached from\nuniversal_pidff_probe().\n\nCheck for an empty list before deriving dev and return -ENODEV, as the\nother HID force-feedback drivers already do.  universal_pidff_probe()\npropagates the error and unwinds.\n\nDiscovered by XBOW, triaged by Baul Lee <baul.lee@xbow.com>",
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    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-80780"
    },
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      "url": "https://git.kernel.org/stable/c/2e0471bf3ab2a6b7eedcc3b8a2a17286b6a9ae1a"
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      "url": "https://git.kernel.org/stable/c/4529c03c3da8f91392cd630453452f569973f4cd"
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      "url": "https://git.kernel.org/stable/c/d416eeb7d016d82af67c149d884bc6a9323c4ac7"
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      "url": "https://git.kernel.org/stable/c/86b63adfa5e132beac4be72668fdf9128fe51d2e"
    },
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      "url": "https://git.kernel.org/stable/c/67bb1074e3d2d12fa059a9cc707e89398a4e4704"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-09-04T15:14:07Z"
  }
}