CVE-2021-47372 net: macb: fix use after free on rmmod
A use-after-free vulnerability in the Linux kernel macb driver allows attackers to cause denial of service or potentially execute code during module removal.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-47372?
CVE-2021-47372 is a high-severity use after free vulnerability in Linux kernel, published on 21 May 2024. 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:
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
Weakness: CWE-416
Which versions are affected by CVE-2021-47372?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2021-47372?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2021-47372 being exploited?
There is no known exploitation of CVE-2021-47372 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2021-47372, GHSA-6hmf-7mx4-83j8, UBUNTU-CVE-2021-47372.