CVE-2026-63934

Descrição

In the Linux kernel, the following vulnerability has been resolved: iio: gyro: itg3200: fix i2c read into the wrong stack location itg3200_read_all_channels() takes `__be16 *buf- as a parameter and fills the i2c_msg destination as `(char *)&buf-. Since `buf- is the parameter (a pointer), `&buf- is the address of the local pointer slot on the stack of itg3200_read_all_channels(), not the address of the caller-s scan buffer. The (char *) cast hides the type mismatch. i2c_transfer() therefore writes ITG3200_SCAN_ELEMENTS * sizeof(s16) = 8 bytes into the parameter-s stack slot, which is discarded when the function returns. The caller-s scan buffer in itg3200_trigger_handler() is never written to, so iio_push_to_buffers_with_timestamp() pushes uninitialised stack contents to userspace via /dev/iio:deviceX every scan -- both a functional bug (no actual gyroscope or temperature data is delivered through the triggered buffer) and an information leak. The non-buffered read_raw() path is unaffected: it goes through itg3200_read_reg_s16() which uses `&out- on a local s16 value, where that is correct. Drop the spurious `&- so the i2c read writes into the caller-s buffer.