Kernel stack disclosure via uninitialized IIO scan buffer

Information disclosure in Linux 6.16 through 6.16.3 and 6.17-rc1 through 6.17-rc2 allows local users to read kernel stack data via IIO scans. The sca3300_trigger_handler fills only active entries in its stack-allocated channels array, then exports scan storage containing uncleared bytes to user space. Access requires a system using the SCA3300 or SCL3300 IIO driver, compatible sensor hardware, and permission to read its triggered buffer; the consequence is limited to disclosure of residual kernel-stack contents.