{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-89999",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-89999"
  ],
  "published": "2026-09-16T10:32:03Z",
  "summary": "HID: wacom: validate report length in wacom_intuos_pro2_bt_irq",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nHID: wacom: validate report length in wacom_intuos_pro2_bt_irq\n\nwacom_intuos_pro2_bt_irq() receives the wire report length in `len`\nbut never consults it before parsing. After the report-id gate it\nunconditionally calls wacom_intuos_pro2_bt_pen() and then, selected by\nfeatures.type, a fixed chain of sub-parsers, none of which receive\n`len`:\n\n\twacom_intuos_pro2_bt_pen(wacom);\n\tif (type == INTUOSP2_BT || type == INTUOSP2S_BT) {\n\t\twacom_intuos_pro2_bt_touch(wacom);\n\t\twacom_intuos_pro2_bt_pad(wacom);\n\t\twacom_intuos_pro2_bt_battery(wacom);\n\t} else {\n\t\twacom_intuos_gen3_bt_pad(wacom);\n\t\twacom_intuos_gen3_bt_battery(wacom);\n\t}\n\nEach sub-parser dereferences wacom->data at fixed offsets. The furthest\nbyte touched on each branch is:\n\n  INTUOSP2_BT / INTUOSP2S_BT: wacom_intuos_pro2_bt_pad() reads data[285]\n\t(the touchring byte), so the report must be at least 286 bytes;\n  INTUOSHT3_BT (\"gen3\"): wacom_intuos_gen3_bt_battery() reads data[45],\n\tso the report must be at least 46 bytes.\n\nfeatures.type is selected from the VID/PID id_table entry and\nwacom_setup_device_quirks() force-registers the pen/pad/touch inputs\nfor that type independent of the report descriptor, so a malicious or\nmalfunctioning paired/spoofed Bluetooth peripheral can advertise that\nVID/PID and send an undersized report that still satisfies the\ndata[0] == 0x80/0x81 gate. The driver then reads past the received\nreport and forwards the bytes to userspace via evdev (MSC_SERIAL /\nABS_MISC / ABS_WHEEL on the pen and pad input nodes), an out-of-bounds\nread with a concrete userspace read-back channel, and a true\nout-of-bounds read on transports whose backing buffer is sized to the\n(small) report descriptor rather than a fixed-size staging buffer.\n\nThis is the same class of bug commit 2f1763f62909 (\"HID: wacom: fix\nout-of-bounds read in wacom_intuos_bt_irq\") already hardened in the\nsibling wacom_intuos_bt_irq(), which guards each report id against its\nminimum length before parsing.\n\nGuard wacom_intuos_pro2_bt_irq() the same way: before parsing, reject\nreports shorter than the furthest offset the selected branch actually\ndereferences, warn, and bail out. Because the whole pen/touch/pad/\nbattery chain runs unconditionally per branch, a single up-front check\nagainst the maximum offset (286 bytes for INTUOSP2_BT/INTUOSP2S_BT,\n46 bytes for the gen3 branch) bounds every sub-parser. Returning 0 on\na short report also skips those calls for the same malformed report,\nwhich is the safe, conservative behavior.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-89999"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d2844f3fcd058113acbe0aa110ab13ef28b98d9f"
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      "url": "https://git.kernel.org/stable/c/1bfc0547b81d5861443420d19b5ed2fd533cd17f"
    },
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      "url": "https://git.kernel.org/stable/c/84781a1f3c5dc6650480be9329e6e8528939eaa0"
    },
    {
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      "url": "https://git.kernel.org/stable/c/96dd0af7597aba2d80cc97e2f66e8b72d30ba125"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/114af803e409a68e52516810ecd24df4d8ce0c68"
    },
    {
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      "url": "https://git.kernel.org/stable/c/74ec08f7b81c2726578039ca6dea0fec136c38ea"
    },
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      "url": "https://git.kernel.org/stable/c/0cdc6cb242dd8d2731956fdf3390de094482a4b2"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a8e04f3f894ccb52cfcd7e60125a9f35da4a616d"
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  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-09-16T14:40:32Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 8.1,
      "cvss_v3_severity": "High",
      "scenario": "AV:A - wacom_intuos_pro2_bt_irq() is reached only for BUS_BLUETOOTH Wacom Intuos Pro/HT3 devices (VID 0x056a, PIDs 0x360/0x361/0x377/0x379/0x393/0x3c6/0x3c8/0x3dd) via hidp/uhid HID input reports over L2CAP, so the attacker must be a Bluetooth HID peer on the same radio segment.\nAC:L - The attacker fully controls the HID report ID, descriptor, and wire length; any report with data[0]==0x80/0x81 that hid_get_report() accepts is parsed at fixed offsets with no length check, so a short report reliably triggers the OOB read.\nPR:N - The attacker is the Bluetooth HID peripheral sending input reports and needs no local account or capability; BlueZ/hidp connection setup is a host-side management path, not a privilege required of the reporting device.\nUI:N - After a paired, spoofed, or already-connected Intuos Pro/HT3 Bluetooth HID session exists, the peer can emit the short 0x80/0x81 report on the interrupt channel without further victim clicks, pairing prompts, or mounts.\nS:U - The Wacom HID parser and the resulting kernel/input/power_supply impact remain under the same host kernel security authority, with no VM escape, IOMMU/DMA bypass, or other cross-boundary effect.\nC:H - The parsers read wacom->data at fixed offsets through data[285] (286 bytes) ignoring len, which is a kernel OOB read, and those bytes are reported to userspace via evdev (MSC_SERIAL, ABS_MISC, ABS_WHEEL, pen/touch axes), a concrete disclosure channel.\nI:N - The defect is an out-of-bounds read of the HID report buffer, not an OOB write or UAF, and it does not yield an attacker-controlled kernel memory modification or control-flow hijack primitive.\nA:H - Reading hundreds of bytes past a short HID report can fault when the transport buffer is sized to the received report or descriptor rather than a large staging buffer, and an adjacent peer can repeat the malformed report to panic or oops the host."
    }
  }
}