CVE-2021-47205 clk: sunxi-ng: Unregister clocks/resets when unbinding
A missing unregister step in the Linux kernel sunxi-ng clock driver causes a page fault and denial of service when unbinding the device.
- 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-2021-47205?
CVE-2021-47205 is a medium-severity vulnerability in Linux kernel, published on 10 Apr 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:
clk: sunxi-ng: Unregister clocks/resets when unbinding
Currently, unbinding a CCU driver unmaps the device's MMIO region, while leaving its clocks/resets and their providers registered. This can cause a page fault later when some clock operation tries to perform MMIO. Fix this by separating the CCU initialization from the memory allocation, and then using a devres callback to unregister the clocks and resets.
This also fixes a memory leak of the `struct ccu_reset`, and uses the correct owner (the specific platform driver) for the clocks and resets.
Early OF clock providers are never unregistered, and limited error handling is possible, so they are mostly unchanged. The error reporting is made more consistent by moving the message inside of_sunxi_ccu_probe.
Weakness: CWE-401
Which versions are affected by CVE-2021-47205?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2021-47205?
Apply the vendor's patch.
Is CVE-2021-47205 being exploited?
There is no known exploitation of CVE-2021-47205 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2021-47205, GHSA-2q8v-283f-c73j, ROOT-OS-DEBIAN-11-CVE-2021-47205, UBUNTU-CVE-2021-47205.