{"id":"CVE-2026-80781","state":"PUBLISHED","title":"HID: core: fix OOB read of field->usage in hid_set_field()","description":"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>","publishedAt":"2026-09-04T15:12:52.980Z","updatedAt":"2026-10-19T08:43:36.573Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"465544b3d6602cfbdc2305d5cbfb7f4954353b63","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"4993e1ab85d7d3f4a40d81852170f9665483bbd8","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"313ead1abed945544703b100a12c5a10fdf78409","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"c1d9c16af51cc6ff92a5a062617d3b022dd01078","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"a38212687519f2a72f43e62dec1348a690412404","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"9a1d7c5f0d82e8665715d5e47c9410c6a97e3748","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"5215ea00a747eca34cb2f603cfef91fef76c2558","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"cbcc0e8dea499e5ca86b583372ccb1815cccc570","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"a13cdb19fcb223ed41bdab3bab42b98dba87e90b","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/hid/hid-core.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.12","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.12","versionType":"semver"},{"version":"5.10.267","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.218","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.185","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.154","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.106","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.47","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.11","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2.1","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/hid/hid-core.c"]}],"references":["https://git.kernel.org/stable/c/465544b3d6602cfbdc2305d5cbfb7f4954353b63","https://git.kernel.org/stable/c/4993e1ab85d7d3f4a40d81852170f9665483bbd8","https://git.kernel.org/stable/c/313ead1abed945544703b100a12c5a10fdf78409","https://git.kernel.org/stable/c/c1d9c16af51cc6ff92a5a062617d3b022dd01078","https://git.kernel.org/stable/c/a38212687519f2a72f43e62dec1348a690412404","https://git.kernel.org/stable/c/9a1d7c5f0d82e8665715d5e47c9410c6a97e3748","https://git.kernel.org/stable/c/5215ea00a747eca34cb2f603cfef91fef76c2558","https://git.kernel.org/stable/c/cbcc0e8dea499e5ca86b583372ccb1815cccc570","https://git.kernel.org/stable/c/a13cdb19fcb223ed41bdab3bab42b98dba87e90b"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:07.220Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/80xxx/CVE-2026-80781.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-80781","state":"PUBLISHED","datePublished":"2026-09-04T15:12:52.980Z","dateUpdated":"2026-10-19T08:43:36.573Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-08-26T14:34:25.792Z"},"containers":{"cna":{"title":"HID: core: fix OOB read of field->usage in hid_set_field()","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>"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"465544b3d6602cfbdc2305d5cbfb7f4954353b63","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"4993e1ab85d7d3f4a40d81852170f9665483bbd8","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"313ead1abed945544703b100a12c5a10fdf78409","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"c1d9c16af51cc6ff92a5a062617d3b022dd01078","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"a38212687519f2a72f43e62dec1348a690412404","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"9a1d7c5f0d82e8665715d5e47c9410c6a97e3748","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"5215ea00a747eca34cb2f603cfef91fef76c2558","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"cbcc0e8dea499e5ca86b583372ccb1815cccc570","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"a13cdb19fcb223ed41bdab3bab42b98dba87e90b","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/hid/hid-core.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.12","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.12","versionType":"semver"},{"version":"5.10.267","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.218","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.185","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.154","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.106","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.47","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.11","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2.1","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/hid/hid-core.c"]}],"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"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T08:43:36.573Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"5.10.267"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"5.15.218"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"6.1.185"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"6.6.154"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"6.12.106"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"6.18.47"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"7.1.11"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"7.2.1"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}