CVE-2026-80781
In the Linux kernel, the following vulnerability has been resolved:
HID: core: fix OOB read of field->usage in hid_set_field()
hid_set_field() hands field->usage + offset to hid_dump_input() before the guard that bounds offset:
Under CONFIG_DEBUG_FS hid_dump_input() dereferences that pointer, with buf = hid_resolv_usage(usage->hid, NULL). The usage[] array is allocated inline with the hid_field in hid_register_field() and holds field->maxusage entries, so an offset past it reads off the end of the kvzalloc()ed allocation and into a neighbouring object. Had the guard run first, offset < report_count <= maxusage would already have confined the pointer to the array.
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A caller supplies such an offset today. picolcd_fb_send_tile() validates only report->maxfield before issuing hid_set_field(report->field[0], 11 + i, ...) for i = 0..31, so its offsets are fixed at 11..42 and are never checked against the bound field. When the device registers that field with fewer usages, the framebuffer deferred-io work drives the read on every tile. KASAN reports a 4-byte slab-out-of-bounds read in hid_dump_input() below hid_set_field(), and the same boot logs "offset (1) exceeds report_count (1)" from the guard that runs only afterwards.
Move the hid_dump_input() call below the guard. Because field->maxusage >= field->report_count, the guard then establishes that field->usage + offset lies inside the array before it is dereferenced, for every caller and without changing behaviour on the valid path.
Discovered by XBOW, triaged by Baul Lee <baul.lee@xbow.com>
Detalles técnicos trazas, registros y código del informe original
hid_dump_input(field->report->device, field->usage + offset, value);
if (offset >= field->report_count) {
hid_err(...);
return -1;
}CVSS
NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.19%
- Percentil entre todas las CVEs puntuadas: 8
- Fecha de la puntuación: 6/10/2026
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).
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/313ead1abed945544703b100a12c5a10fdf78409
- https://git.kernel.org/stable/c/465544b3d6602cfbdc2305d5cbfb7f4954353b63
- https://git.kernel.org/stable/c/4993e1ab85d7d3f4a40d81852170f9665483bbd8
- https://git.kernel.org/stable/c/5215ea00a747eca34cb2f603cfef91fef76c2558
- https://git.kernel.org/stable/c/9a1d7c5f0d82e8665715d5e47c9410c6a97e3748
- https://git.kernel.org/stable/c/a13cdb19fcb223ed41bdab3bab42b98dba87e90b
- https://git.kernel.org/stable/c/a38212687519f2a72f43e62dec1348a690412404
- https://git.kernel.org/stable/c/c1d9c16af51cc6ff92a5a062617d3b022dd01078
- https://git.kernel.org/stable/c/cbcc0e8dea499e5ca86b583372ccb1815cccc570
JSON original (NVD)
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{
"id": "CVE-2026-80781",
"cveTags": [],
"metrics": {},
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"published": "2026-09-04T16:18:03.867",
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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Received",
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nHID: core: fix OOB read of field->usage in hid_set_field()\n\nhid_set_field() hands field->usage + offset to hid_dump_input() before\nthe guard that bounds offset:\n\n\thid_dump_input(field->report->device, field->usage + offset, value);\n\n\tif (offset >= field->report_count) {\n\t\thid_err(...);\n\t\treturn -1;\n\t}\n\nUnder CONFIG_DEBUG_FS hid_dump_input() dereferences that pointer, with\nbuf = hid_resolv_usage(usage->hid, NULL). The usage[] array is\nallocated inline with the hid_field in hid_register_field() and holds\nfield->maxusage entries, so an offset past it reads off the end of the\nkvzalloc()ed allocation and into a neighbouring object. Had the guard\nrun first, offset < report_count <= maxusage would already have confined\nthe pointer to the array.\n\nA caller supplies such an offset today. picolcd_fb_send_tile()\nvalidates only report->maxfield before issuing\nhid_set_field(report->field[0], 11 + i, ...) for i = 0..31, so its\noffsets are fixed at 11..42 and are never checked against the bound\nfield. When the device registers that field with fewer usages, the\nframebuffer deferred-io work drives the read on every tile. KASAN\nreports a 4-byte slab-out-of-bounds read in hid_dump_input() below\nhid_set_field(), and the same boot logs \"offset (1) exceeds\nreport_count (1)\" from the guard that runs only afterwards.\n\nMove the hid_dump_input() call below the guard. Because\nfield->maxusage >= field->report_count, the guard then establishes that\nfield->usage + offset lies inside the array before it is dereferenced,\nfor every caller and without changing behaviour on the valid path.\n\nDiscovered by XBOW, triaged by Baul Lee <baul.lee@xbow.com>"
}
],
"lastModified": "2026-09-04T16:18:03.867",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}