CVE-2023-54204 mmc: sunplus: fix return value check of mmc_add_host()
A missing return value check in the Sunplus MMC driver can cause a null pointer dereference and memory leak, leading to a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2023-54204?
CVE-2023-54204 is a vulnerability in Linux, published on 30 Dec 2025. 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:
mmc: sunplus: fix return value check of mmc_add_host()
mmc_add_host() may return error, if we ignore its return value, 1. the memory allocated in mmc_alloc_host() will be leaked 2. null-ptr-deref will happen when calling mmc_remove_host() in remove function spmmc_drv_remove() because deleting not added device.
Fix this by checking the return value of mmc_add_host(). Moreover, I fixed the error handling path of spmmc_drv_probe() to clean up.
Which versions are affected by CVE-2023-54204?
How do I fix CVE-2023-54204?
Apply the vendor's patch.
Is CVE-2023-54204 being exploited?
There is no known exploitation of CVE-2023-54204 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2023-54204, DEBIAN-CVE-2023-54204, GHSA-f722-q47q-2685, UBUNTU-CVE-2023-54204.