CVE-2022-50640 mmc: core: Fix kernel panic when remove non-standard SDIO card
A use-after-free vulnerability in the Linux kernel MMC core allows local attackers to cause a kernel panic by removing a non-standard SDIO card.
- 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-2022-50640?
CVE-2022-50640 is an use after free 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: core: Fix kernel panic when remove non-standard SDIO card
SDIO tuple is only allocated for standard SDIO card, especially it causes memory corruption issues when the non-standard SDIO card has removed, which is because the card device's reference counter does not increase for it at sdio_init_func(), but all SDIO card device reference counter gets decreased at sdio_release_func().
Which versions are affected by CVE-2022-50640?
How do I fix CVE-2022-50640?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2022-50640 being exploited?
There is no known exploitation of CVE-2022-50640 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2022-50640, GHSA-4w99-c287-2jvj, UBUNTU-CVE-2022-50640.