{"id":"CVE-2026-89628","revision":"61531267602a4830b863396dd0bd90d6","records":[{"revision":"61531267602a4830b863396dd0bd90d6","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-89628","aliases":[],"title":"HID: picolcd: clamp eeprom debugfs read to bytes actually received","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nHID: picolcd: clamp eeprom debugfs read to bytes actually received\n\npicolcd_debug_eeprom_read() trusts resp->raw_data[2] -- a length byte\nsupplied by the device in its REPORT_EE_DATA reply -- clamped only to\nthe caller's read() count:\n\n\tret = resp->raw_data[2];\n\tif (ret > s)\n\t\tret = s;\n\tif (copy_to_user(u, resp->raw_data+3, ret))\n\nIt never checks resp->raw_size, the number of bytes picolcd_raw_event()\nactually copied into the 64-byte raw_data[] of the kmalloc'd struct\npicolcd_pending. A device (or a spoofed picoLCD) returning a length byte\nof 0xff, read with a count >= 255, makes copy_to_user() read past\nraw_data[] into adjacent slab memory and return it to userspace through\nthe debugfs \"eeprom\" file:\n\n\tBUG: KASAN: slab-out-of-bounds in _copy_to_user\n\tRead of size 255 ... picolcd_debug_eeprom_read+0x214/0x2f0 [hid_picolcd]\n\nThe debug-dump path in the same file already validates the device length\nbyte against the received size before trusting it; this read does not.\nThe file is created S_IRUSR (root-only) and a crafted device is needed,\nso it is neither unprivileged- nor remotely-triggerable.\n\nClamp the copy length to resp->raw_size - 3 (the payload actually\nreceived, minus the 3-byte header), floored at 0 for short replies.","state":0,"publishedAt":"2026-09-11T19:45:24.203+00:00","modifiedAt":"2026-10-19T08:50:00.49+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/hid/hid-picolcd_debugfs.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"9bbf2b98ba11d00bd73e3254e15cfe17ccaff6ba\",\n                            \"lessThan\": \"1a02056c2bf7ef9b5fd05ee6913aeeadb703c443\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"9bbf2b98ba11d00bd73e3254e15cfe17ccaff6ba\",\n                            \"lessThan\": \"65daa322f1021d8206f8032c4cd4c0cb2d26c7c3\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"9bbf2b98ba11d00bd73e3254e15cfe17ccaff6ba\",\n                            \"lessThan\": \"8dc662af019158690c470edd2e2857657f700abb\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"9bbf2b98ba11d00bd73e3254e15cfe17ccaff6ba\",\n                            \"lessThan\": \"4daf432c94a42e7be6aa10b012b33af5ed9bc118\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"9bbf2b98ba11d00bd73e3254e15cfe17ccaff6ba\",\n                            \"lessThan\": \"a3e6e8d7198a9f3861861520a38b673684a1062b\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"9bbf2b98ba11d00bd73e3254e15cfe17ccaff6ba\",\n                            \"lessThan\": \"471f4a939c66d1d44aece2321807abf609fc9098\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"9bbf2b98ba11d00bd73e3254e15cfe17ccaff6ba\",\n                            \"lessThan\": \"699a3c8b56e168ca19d12722f3f5ef1d6f4b1d84\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"9bbf2b98ba11d00bd73e3254e15cfe17ccaff6ba\",\n                            \"lessThan\": \"e9c667395ac1f8024f623250b32bae4c7af9caa0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/hid/hid-picolcd_debugfs.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"2.6.35\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"2.6.35\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.270\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.221\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.188\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.157\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.109\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.50\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.4\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/1a02056c2bf7ef9b5fd05ee6913aeeadb703c443","https://git.kernel.org/stable/c/65daa322f1021d8206f8032c4cd4c0cb2d26c7c3","https://git.kernel.org/stable/c/8dc662af019158690c470edd2e2857657f700abb","https://git.kernel.org/stable/c/4daf432c94a42e7be6aa10b012b33af5ed9bc118","https://git.kernel.org/stable/c/a3e6e8d7198a9f3861861520a38b673684a1062b","https://git.kernel.org/stable/c/471f4a939c66d1d44aece2321807abf609fc9098","https://git.kernel.org/stable/c/699a3c8b56e168ca19d12722f3f5ef1d6f4b1d84","https://git.kernel.org/stable/c/e9c667395ac1f8024f623250b32bae4c7af9caa0"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-89628","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-89628","identifiers":["CVE-2026-89628"]},"retained":false,"historicalAffected":[]}],"coverage":[]}