CVE-2026-63965 iio: pressure: bmp280: fix stack leak in bmp580 trigger handler
A stack leak in the BMP580 pressure sensor driver allows local attackers to read uninitialized kernel stack memory via sensor data channels.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-63965?
CVE-2026-63965 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: 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.
Which versions are affected by CVE-2026-63965?
How do I fix CVE-2026-63965?
Apply the vendor's patch.
Is CVE-2026-63965 being exploited?
There is no known exploitation of CVE-2026-63965 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-63965, DEBIAN-CVE-2026-63965, GHSA-7wfc-wfh5-rxrh, UBUNTU-CVE-2026-63965.