CVE-2026-63966 iio: imu: adis16550: fix stack leak in trigger handler
A local attacker can read uninitialized kernel stack memory via the adis16550 IMU trigger handler, potentially exposing sensitive data.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-63966?
CVE-2026-63966 is a vulnerability in Linux, published on 19 Jul 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
iio: imu: adis16550: fix stack leak in trigger handler
adis16550_trigger_handler() declares the scan data array on the stack without initializing it. The memcpy() at the bottom fills only the first 28 bytes (TEMP + 6 channels of GYRO/ACCEL data), and iio_push_to_buffers_with_timestamp() writes the s64 timestamp at the 8-byte-aligned offset 32. Bytes 28-31 remain uninitialized stack data which leaks to userspace on ever trigger.
Fix this all by just zero-initializing the structure on the stack.
Which versions are affected by CVE-2026-63966?
How do I fix CVE-2026-63966?
Apply the vendor's patch.
Is CVE-2026-63966 being exploited?
There is no known exploitation of CVE-2026-63966 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-63966, DEBIAN-CVE-2026-63966, GHSA-jr6w-9rm3-jj48, UBUNTU-CVE-2026-63966.