CVE-2021-47334: Linux Kernel

High severity, CVSS 7.8. EPSS: 0.3% chance of exploitation in the next 30 days.

In the Linux kernel, the following vulnerability has been resolved: misc/libmasm/module: Fix two use after free in ibmasm_init_one In ibmasm_init_one, it calls ibmasm_init_remote_input_dev(). Inside ibmasm_init_remote_input_dev, mouse_dev and keybd_dev are allocated by input_allocate_device(), and assigned to sp->remote.mouse_dev and sp->remote.keybd_dev respectively. In the err_free_devices error branch of ibmasm_init_one, mouse_dev and keybd_dev are freed by input_free_device(), and return error. Then the execution runs into error_send_message error branch of ibmasm_init_one, where ibmasm_free_remote_input_dev(sp) is called to unregister the freed sp->remote.mouse_dev and sp->remote.keybd_dev. My patch add a "error_init_remote" label to handle the error of ibmasm_init_remote_input_dev(), to avoid the uaf bugs.

Affected products

• Linux Linux Kernel: before 4.4.276 (fixed in 4.4.276); from 4.5, before 4.9.276 (fixed in 4.9.276); from 4.10, before 4.14.240 (fixed in 4.14.240); from 4.15, before 4.19.198 (fixed in 4.19.198); from 4.20, before 5.4.134 (fixed in 5.4.134); from 5.5, before 5.10.52 (fixed in 5.10.52); …

Published 2024-05-21. Last modified 2026-06-17.