CVE-2021-47372 net: macb: fix use after free on rmmod

2024-05-2115:03:37

Linux

github.com

linux kernel

vulnerability

net

macb

use after free

rmmod

platform data

device unregister

clk device

kasan

AI Score

6.9

Confidence

Low

SSVC

Exploitation

none

Automatable

Technical Impact

partial

JSON

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

net: macb: fix use after free on rmmod

plat_dev->dev->platform_data is released by platform_device_unregister(),
use of pclk and hclk is a use-after-free. Since device unregister won’t
need a clk device we adjust the function call sequence to fix this issue.

[ 31.261225] BUG: KASAN: use-after-free in macb_remove+0x77/0xc6 [macb_pci]
[ 31.275563] Freed by task 306:
[ 30.276782] platform_device_release+0x25/0x80