CVE-2021-47500: Linux Kernel

High severity, CVSS 7.8. EPSS: 0.2% chance of exploitation in the next 30 days.

In the Linux kernel, the following vulnerability has been resolved: iio: mma8452: Fix trigger reference couting The mma8452 driver directly assigns a trigger to the struct iio_dev. The IIO core when done using this trigger will call `iio_trigger_put()` to drop the reference count by 1. Without the matching `iio_trigger_get()` in the driver the reference count can reach 0 too early, the trigger gets freed while still in use and a use-after-free occurs. Fix this by getting a reference to the trigger before assigning it to the IIO device.

Affected products

• Linux Linux Kernel: from 4.2, before 4.4.295 (fixed in 4.4.295); from 4.5, before 4.9.293 (fixed in 4.9.293); from 4.10, before 4.14.258 (fixed in 4.14.258); from 4.15, before 4.19.221 (fixed in 4.19.221); from 4.20, before 5.4.165 (fixed in 5.4.165); from 5.5, before 5.10.85 (fixed in 5.10.85); …

Published 2024-05-24. Last modified 2026-08-04.