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

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-05-21 · updated 2026-06-17
Weakness: CWE-416

Description

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

Affected products

Linux kernel: before 4.14.249; from 4.15 before 4.19.209; from 4.20 before 5.4.150; from 5.5 before 5.10.70; from 5.11 before 5.14.9; 5.15-rc1 — fixed in 4.14.249, 4.19.209, 5.10.70, 5.14.9, 5.4.150

How to fix

Upgrade to a fixed version: Linux kernel 4.14.249, 4.19.209, 5.10.70, 5.14.9. Check the vendor advisory for mitigations.

References

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