CVE-2022-50858 mmc: alcor: fix return value check of mmc_add_host()
A missing return value check in the Alcor MMC driver can cause a kernel crash, leading to denial of service for local attackers.
- 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-2022-50858?
CVE-2022-50858 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: alcor: fix return value check of mmc_add_host()
mmc_add_host() may return error, if we ignore its return value, the memory that allocated in mmc_alloc_host() will be leaked and it will lead a kernel crash because of deleting not added device in the remove path.
So fix this by checking the return value and calling mmc_free_host() in the error path.
Which versions are affected by CVE-2022-50858?
How do I fix CVE-2022-50858?
Apply the vendor's patch.
Is CVE-2022-50858 being exploited?
There is no known exploitation of CVE-2022-50858 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2022-50858, GHSA-m3wv-5mmv-w433, UBUNTU-CVE-2022-50858.