CVE-2026-63967

/// Technical description

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

iio: imu: st_lsm6dsx: fix stack leak in tagged FIFO buffer

The tagged FIFO path declares iio_buff on the stack with __aligned(8)

but no initializer, but there is a hole in the structure, which will

then leak to userspace as ST_LSM6DSX_SAMPLE_SIZE bytes (6) will be

copied, but the space between that and the timestamp are not

initialized.

Commit c14edb4d0bdc ("iio:imu:st_lsm6dsx Fix alignment and data leak

issues") moved the untagged FIFO path to a kzalloc'd buffer in hw->scan,

but for the tagged path it only added the alignment qualifier and not

the initializer :(

Fix this by just zero-initializing the structure on the stack.

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References