CVE-2026-98669

In the Linux kernel, the following vulnerability has been resolved:

iio: buffer: serialize buffer teardown with mode claims

Buffer-mode claims hold mlock to guarantee that the device remains in

buffer mode until the claim is released. Normal buffer updates take

info_exist_lock followed by mlock in iio_update_buffers().

However, iio_device_unregister() disables and deactivates all buffers

without taking mlock. This can invalidate buffer state, including

active_scan_mask, while a buffer-mode claim is held.

Take mlock in iio_disable_all_buffers() so that unregister honors the

mode-claim lifetime guarantee. The info_exist_lock -> mlock ordering

matches iio_update_buffers().