{"id":"CVE-2026-80781","title":"HID: core: fix OOB read of field->usage in hid_set_field()","summary":"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_d…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 465544b3d6602cfbdc2305d5cbfb7f4954353b63","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 4993e1ab85d7d3f4a40d81852170f9665483bbd8","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 313ead1abed945544703b100a12c5a10fdf78409","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < c1d9c16af51cc6ff92a5a062617d3b022dd01078","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < a38212687519f2a72f43e62dec1348a690412404","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 9a1d7c5f0d82e8665715d5e47c9410c6a97e3748","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 5215ea00a747eca34cb2f603cfef91fef76c2558","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < cbcc0e8dea499e5ca86b583372ccb1815cccc570","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < a13cdb19fcb223ed41bdab3bab42b98dba87e90b","Linux 2.6.12"],"published":"2026-09-04","updated":"2026-10-19","sourceUpdated":"2026-10-19T08:43:36.573Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-80781","references":[{"url":"https://git.kernel.org/stable/c/465544b3d6602cfbdc2305d5cbfb7f4954353b63"},{"url":"https://git.kernel.org/stable/c/4993e1ab85d7d3f4a40d81852170f9665483bbd8"},{"url":"https://git.kernel.org/stable/c/313ead1abed945544703b100a12c5a10fdf78409"},{"url":"https://git.kernel.org/stable/c/c1d9c16af51cc6ff92a5a062617d3b022dd01078"},{"url":"https://git.kernel.org/stable/c/a38212687519f2a72f43e62dec1348a690412404"},{"url":"https://git.kernel.org/stable/c/9a1d7c5f0d82e8665715d5e47c9410c6a97e3748"},{"url":"https://git.kernel.org/stable/c/5215ea00a747eca34cb2f603cfef91fef76c2558"},{"url":"https://git.kernel.org/stable/c/cbcc0e8dea499e5ca86b583372ccb1815cccc570"},{"url":"https://git.kernel.org/stable/c/a13cdb19fcb223ed41bdab3bab42b98dba87e90b"}],"tags":["cve.org"],"epss":0.00195,"epssPercentile":0.08589,"ingestedAt":"2026-10-19T10:20:54.957Z","slug":"CVE-2026-80781","body":"## Overview\n\nIn 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>\n\n## Affected\n\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 465544b3d6602cfbdc2305d5cbfb7f4954353b63`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 4993e1ab85d7d3f4a40d81852170f9665483bbd8`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 313ead1abed945544703b100a12c5a10fdf78409`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < c1d9c16af51cc6ff92a5a062617d3b022dd01078`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < a38212687519f2a72f43e62dec1348a690412404`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 9a1d7c5f0d82e8665715d5e47c9410c6a97e3748`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 5215ea00a747eca34cb2f603cfef91fef76c2558`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < cbcc0e8dea499e5ca86b583372ccb1815cccc570`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < a13cdb19fcb223ed41bdab3bab42b98dba87e90b`\n- `Linux 2.6.12`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}