CVE-2026-63965

Technical Description

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

iio: pressure: bmp280: fix stack leak in bmp580 trigger handler

bmp580_trigger_handler() declares its scan buffer on the stack without

an initializer and then memcpy()s 3 bytes of 24-bit sensor data into

each 4-byte __le32 field. The high byte of comp_temp and comp_press is

left uninitialized, and the channel storagebits is 32, so two bytes of

stack are pushed to userspace per scan.

This is a regression from when the buffer lived in the private data, the

move to a stack-local struct dropped the implicit zeroing.

bme280_trigger_handler() was fixed up to handle this bug, but this

driver was not fixed because there was no padding hole, but rather a

short-fill issue.

Fix this all 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