{"id":"CVE-2026-89999","summary":"HID: wacom: validate report length in wacom_intuos_pro2_bt_irq","details":"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-\u003edata 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.","modified":"2026-09-18T03:48:34.790049313Z","published":"2026-09-16T10:33:10.683Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89999.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0cdc6cb242dd8d2731956fdf3390de094482a4b2"},{"type":"WEB","url":"https://git.kernel.org/stable/c/114af803e409a68e52516810ecd24df4d8ce0c68"},{"type":"WEB","url":"https://git.kernel.org/stable/c/1bfc0547b81d5861443420d19b5ed2fd533cd17f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/74ec08f7b81c2726578039ca6dea0fec136c38ea"},{"type":"WEB","url":"https://git.kernel.org/stable/c/84781a1f3c5dc6650480be9329e6e8528939eaa0"},{"type":"WEB","url":"https://git.kernel.org/stable/c/96dd0af7597aba2d80cc97e2f66e8b72d30ba125"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a8e04f3f894ccb52cfcd7e60125a9f35da4a616d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d2844f3fcd058113acbe0aa110ab13ef28b98d9f"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89999.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89999"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4922cd26f03c1c71bf7dd6cbdb638e7e36a4a50b"},{"fixed":"d2844f3fcd058113acbe0aa110ab13ef28b98d9f"},{"fixed":"1bfc0547b81d5861443420d19b5ed2fd533cd17f"},{"fixed":"84781a1f3c5dc6650480be9329e6e8528939eaa0"},{"fixed":"96dd0af7597aba2d80cc97e2f66e8b72d30ba125"},{"fixed":"114af803e409a68e52516810ecd24df4d8ce0c68"},{"fixed":"74ec08f7b81c2726578039ca6dea0fec136c38ea"},{"fixed":"0cdc6cb242dd8d2731956fdf3390de094482a4b2"},{"fixed":"a8e04f3f894ccb52cfcd7e60125a9f35da4a616d"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89999.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.11.0"},{"fixed":"5.10.270"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.221"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.188"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.157"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.110"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.51"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.5"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89999.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H"}]}