{"id":"CVE-2026-80575","summary":"Input: cs40l50-vibra - validate custom data from user space","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nInput: cs40l50-vibra - validate custom data from user space\n\ncs40l50_add() copies the custom data of an FF_PERIODIC/FF_CUSTOM effect\nstraight from the ff_effect the user passed to EVIOCSFF, without\nrequiring it to hold anything:\n\n    work_data.custom_data = memdup_array_user(periodic-\u003ecustom_data,\n                                              periodic-\u003ecustom_len,\n                                              sizeof(s16));\n    work_data.custom_len = periodic-\u003ecustom_len;\n\nThe driver then reads two words out of that buffer: custom_data[0] as the\nwaveform bank in cs40l50_effect_bank_set(), and custom_data[1] as the\nindex within the bank in cs40l50_effect_index_set().  Neither read is\ncovered by a length check, and custom_len is fully user controlled:\n\n  - custom_len == 0 makes memdup_array_user() call memdup_user() with a\n    length of zero, which returns ZERO_SIZE_PTR rather than an error, so\n    custom_data[0] dereferences it.\n\n  - custom_len == 1 allocates two bytes.  A bank of ROM or RAM keeps\n    effect-\u003etype out of the OWT case, and custom_data[1] is then read one\n    word past the allocation.\n\nThe bank value itself is also mishandled.  It is masked with\nCS40L50_CUSTOM_DATA_MASK (0xffff) but stored in an s16, so a\ncustom_data[0] of 0x8000 or above wraps to a negative value that passes\nthe \"bank_type \u003e= CS40L50_WVFRM_BANK_NUM\" test.\ncs40l50_effect_index_set() indexes vib-\u003edsp.banks[] with it before the\nswitch statement's default case gets a chance to reject it:\n\n    base_index = vib-\u003edsp.banks[effect-\u003etype].base_index;\n    max_index = vib-\u003edsp.banks[effect-\u003etype].max_index;\n\nRequire the two words the driver reads to be present, and hold the masked\nbank in a u32 so the existing upper-bound test covers the whole range.\nThe da7280 haptic driver already range checks custom_len this way.","modified":"2026-08-28T03:47:28.891075674Z","published":"2026-08-26T14:37:34.942Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80575.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/3855b6a11f8a7aceb8181cc08c99afef58517006"},{"type":"WEB","url":"https://git.kernel.org/stable/c/52a818c586ae2c36b7324bfaefb547f5e866a8ae"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7d5c576cb1c86047b1fcb1aa9532e17fc5e46c1d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d38554602a0b04e85fad28ce72c7500cf50d419b"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80575.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80575"},{"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":"c38fe1bb5d21c2ce0857965ee06174ee587d6b42"},{"fixed":"3855b6a11f8a7aceb8181cc08c99afef58517006"},{"fixed":"52a818c586ae2c36b7324bfaefb547f5e866a8ae"},{"fixed":"d38554602a0b04e85fad28ce72c7500cf50d419b"},{"fixed":"7d5c576cb1c86047b1fcb1aa9532e17fc5e46c1d"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80575.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.11.0"},{"fixed":"6.12.105"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.46"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.10"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80575.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}