CVE-2026-80575

*** Pendiente de traducción *** In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> Input: cs40l50-vibra - validate custom data from user space<br /> <br /> cs40l50_add() copies the custom data of an FF_PERIODIC/FF_CUSTOM effect<br /> straight from the ff_effect the user passed to EVIOCSFF, without<br /> requiring it to hold anything:<br /> <br /> work_data.custom_data = memdup_array_user(periodic-&gt;custom_data,<br /> periodic-&gt;custom_len,<br /> sizeof(s16));<br /> work_data.custom_len = periodic-&gt;custom_len;<br /> <br /> The driver then reads two words out of that buffer: custom_data[0] as the<br /> waveform bank in cs40l50_effect_bank_set(), and custom_data[1] as the<br /> index within the bank in cs40l50_effect_index_set(). Neither read is<br /> covered by a length check, and custom_len is fully user controlled:<br /> <br /> - custom_len == 0 makes memdup_array_user() call memdup_user() with a<br /> length of zero, which returns ZERO_SIZE_PTR rather than an error, so<br /> custom_data[0] dereferences it.<br /> <br /> - custom_len == 1 allocates two bytes. A bank of ROM or RAM keeps<br /> effect-&gt;type out of the OWT case, and custom_data[1] is then read one<br /> word past the allocation.<br /> <br /> The bank value itself is also mishandled. It is masked with<br /> CS40L50_CUSTOM_DATA_MASK (0xffff) but stored in an s16, so a<br /> custom_data[0] of 0x8000 or above wraps to a negative value that passes<br /> the "bank_type &gt;= CS40L50_WVFRM_BANK_NUM" test.<br /> cs40l50_effect_index_set() indexes vib-&gt;dsp.banks[] with it before the<br /> switch statement&amp;#39;s default case gets a chance to reject it:<br /> <br /> base_index = vib-&gt;dsp.banks[effect-&gt;type].base_index;<br /> max_index = vib-&gt;dsp.banks[effect-&gt;type].max_index;<br /> <br /> Require the two words the driver reads to be present, and hold the masked<br /> bank in a u32 so the existing upper-bound test covers the whole range.<br /> The da7280 haptic driver already range checks custom_len this way.