CVE-2022-50886 mmc: toshsd: fix return value check of mmc_add_host()
A missing return value check in the toshsd MMC driver can cause a kernel crash due to improper 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-2022-50886?
CVE-2022-50886 is a memory corruption 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: toshsd: 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 goto error path which will call mmc_free_host(), besides, free_irq() also needs be called.
Which versions are affected by CVE-2022-50886?
How do I fix CVE-2022-50886?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2022-50886 being exploited?
There is no known exploitation of CVE-2022-50886 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2022-50886, GHSA-78fc-p8m9-qw92, UBUNTU-CVE-2022-50886.