CVE-2022-50756 nvme-pci: fix mempool alloc size
A memory corruption vulnerability in the Linux kernel NVMe driver allows attackers to corrupt memory, potentially leading to code execution or system crashes.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2022-50756?
CVE-2022-50756 is a high-severity memory corruption vulnerability in Linux, published on 24 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:
nvme-pci: fix mempool alloc size
Convert the max size to bytes to match the units of the divisor that calculates the worst-case number of PRP entries.
The result is used to determine how many PRP Lists are required. The code was previously rounding this to 1 list, but we can require 2 in the worst case. In that scenario, the driver would corrupt memory beyond the size provided by the mempool.
While unlikely to occur (you'd need a 4MB in exactly 127 phys segments on a queue that doesn't support SGLs), this memory corruption has been observed by kfence.
Which versions are affected by CVE-2022-50756?
How do I fix CVE-2022-50756?
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-2022-50756 being exploited?
There is no known exploitation of CVE-2022-50756 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2022-50756, GHSA-j2wx-wqf4-px3j, UBUNTU-CVE-2022-50756.