CVE-2026-89999
In the Linux kernel, the following vulnerability has been resolved:
HID: wacom: validate report length in wacom_intuos_pro2_bt_irq
wacom_intuos_pro2_bt_irq() receives the wire report length in `len` but never consults it before parsing. After the report-id gate it unconditionally calls wacom_intuos_pro2_bt_pen() and then, selected by features.type, a fixed chain of sub-parsers, none of which receive `len`:
Each sub-parser dereferences wacom->data at fixed offsets. The furthest byte touched on each branch is:
features.type is selected from the VID/PID id_table entry and wacom_setup_device_quirks() force-registers the pen/pad/touch inputs for that type independent of the report descriptor, so a malicious or malfunctioning paired/spoofed Bluetooth peripheral can advertise that VID/PID and send an undersized report that still satisfies the data[0] == 0x80/0x81 gate.
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The driver then reads past the received report and forwards the bytes to userspace via evdev (MSC_SERIAL / ABS_MISC / ABS_WHEEL on the pen and pad input nodes), an out-of-bounds read with a concrete userspace read-back channel, and a true out-of-bounds read on transports whose backing buffer is sized to the (small) report descriptor rather than a fixed-size staging buffer.
This is the same class of bug commit 2f1763f62909 ("HID: wacom: fix out-of-bounds read in wacom_intuos_bt_irq") already hardened in the sibling wacom_intuos_bt_irq(), which guards each report id against its minimum length before parsing.
Guard wacom_intuos_pro2_bt_irq() the same way: before parsing, reject reports shorter than the furthest offset the selected branch actually dereferences, warn, and bail out. Because the whole pen/touch/pad/ battery chain runs unconditionally per branch, a single up-front check against the maximum offset (286 bytes for INTUOSP2_BT/INTUOSP2S_BT, 46 bytes for the gen3 branch) bounds every sub-parser. Returning 0 on a short report also skips those calls for the same malformed report, which is the safe, conservative behavior.
Detalles técnicos trazas, registros y código del informe original
wacom_intuos_pro2_bt_pen(wacom);
if (type == INTUOSP2_BT || type == INTUOSP2S_BT) {
wacom_intuos_pro2_bt_touch(wacom);
wacom_intuos_pro2_bt_pad(wacom);
wacom_intuos_pro2_bt_battery(wacom);
} else {
wacom_intuos_gen3_bt_pad(wacom);
wacom_intuos_gen3_bt_battery(wacom);
}
INTUOSP2_BT / INTUOSP2S_BT: wacom_intuos_pro2_bt_pad() reads data[285]
(the touchring byte), so the report must be at least 286 bytes;
INTUOSHT3_BT ("gen3"): wacom_intuos_gen3_bt_battery() reads data[45],
so the report must be at least 46 bytes.CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
- Puntuación base: 8.1
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.42%
- Percentil entre todas las CVEs puntuadas: 34
- Fecha de la puntuación: 5/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
🎯 Técnicas ATT&CK
Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.
- Explotación
T1210Exploitation of Remote Serviceslateral movement65 % - Impacto principal
T1005Data from Local Systemcollection75 % - Impacto secundario
T1499.004Application or System Exploitationimpact45 %
Vulnerabilidad OOB en controlador Wacom Bluetooth (AV:A) explotable por dispositivo periférico malicioso/spoofed. Lectura de memoria no inicializada hacia userspace vía evdev; potencial DoS por corrupción de datos.
Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.
🛡️ Mitigaciones ATT&CK que cubren estas técnicas
Tecnologías afectadas (1)
⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.
Referencias
- https://git.kernel.org/stable/c/0cdc6cb242dd8d2731956fdf3390de094482a4b2
- https://git.kernel.org/stable/c/114af803e409a68e52516810ecd24df4d8ce0c68
- https://git.kernel.org/stable/c/1bfc0547b81d5861443420d19b5ed2fd533cd17f
- https://git.kernel.org/stable/c/74ec08f7b81c2726578039ca6dea0fec136c38ea
- https://git.kernel.org/stable/c/84781a1f3c5dc6650480be9329e6e8528939eaa0
- https://git.kernel.org/stable/c/96dd0af7597aba2d80cc97e2f66e8b72d30ba125
- https://git.kernel.org/stable/c/a8e04f3f894ccb52cfcd7e60125a9f35da4a616d
- https://git.kernel.org/stable/c/d2844f3fcd058113acbe0aa110ab13ef28b98d9f
JSON original (NVD)
Mostrar
{
"id": "CVE-2026-89999",
"cveTags": [],
"metrics": {
"cvssMetricV31": [
{
"type": "Secondary",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"cvssData": {
"scope": "UNCHANGED",
"version": "3.1",
"baseScore": 8.1,
"attackVector": "ADJACENT_NETWORK",
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
"integrityImpact": "NONE",
"userInteraction": "NONE",
"attackComplexity": "LOW",
"availabilityImpact": "HIGH",
"privilegesRequired": "NONE",
"confidentialityImpact": "HIGH"
},
"impactScore": 5.2,
"exploitabilityScore": 2.8
}
]
},
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
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"vendor": "Linux",
"product": "Linux",
"versions": [
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"status": "affected",
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],
"programFiles": [
"drivers/hid/wacom_wac.c"
],
"defaultStatus": "unaffected"
},
{
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"vendor": "Linux",
"product": "Linux",
"versions": [
{
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"version": "4.11"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.11",
"versionType": "semver"
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{
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"version": "5.10.270",
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},
{
"status": "unaffected",
"version": "6.1.188",
"versionType": "semver",
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},
{
"status": "unaffected",
"version": "6.6.157",
"versionType": "semver",
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},
{
"status": "unaffected",
"version": "6.12.110",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.51",
"versionType": "semver",
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{
"status": "unaffected",
"version": "7.2.5",
"versionType": "semver",
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},
{
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"version": "7.3-rc2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
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],
"defaultStatus": "affected"
}
]
}
],
"published": "2026-09-16T11:17:11.177",
"references": [
{
"url": "https://git.kernel.org/stable/c/0cdc6cb242dd8d2731956fdf3390de094482a4b2",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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{
"url": "https://git.kernel.org/stable/c/a8e04f3f894ccb52cfcd7e60125a9f35da4a616d",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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{
"url": "https://git.kernel.org/stable/c/d2844f3fcd058113acbe0aa110ab13ef28b98d9f",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Received",
"descriptions": [
{
"lang": "en",
"value": "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."
}
],
"lastModified": "2026-09-16T15:18:23.543",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}