CVE-2022-50653 mmc: atmel-mci: fix return value check of mmc_add_host()
A missing return value check in the Atmel MMC driver can cause a kernel crash via null pointer dereference during device removal, leading to 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-2022-50653?
CVE-2022-50653 is a vulnerability in Linux, published on 9 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: atmel-mci: fix return value check of mmc_add_host()
mmc_add_host() may return error, if we ignore its return value, it will lead two issues: 1. The memory that allocated in mmc_alloc_host() is leaked. 2. In the remove() path, mmc_remove_host() will be called to delete device, but it's not added yet, it will lead a kernel crash because of null-ptr-deref in device_del().
So fix this by checking the return value and calling mmc_free_host() in the error path.
Which versions are affected by CVE-2022-50653?
How do I fix CVE-2022-50653?
Apply the vendor's patch.
Is CVE-2022-50653 being exploited?
There is no known exploitation of CVE-2022-50653 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2022-50653, GHSA-ph9x-gxv9-666v, UBUNTU-CVE-2022-50653.