CVE-2022-50775 RDMA/hns: Fix refcount leak in hns_roce_mmap
A refcount leak in the Linux kernel RDMA driver allows local attackers to cause a denial of service by exhausting resources.
- 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-2022-50775?
CVE-2022-50775 is a denial of service 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:
RDMA/hns: Fix refcount leak in hns_roce_mmap
rdma_user_mmap_entry_get_pgoff() takes the reference. Add missing rdma_user_mmap_entry_put() to release the reference.
Acked-by Haoyue Xu <[email protected]>
Which versions are affected by CVE-2022-50775?
How do I fix CVE-2022-50775?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2022-50775 being exploited?
There is no known exploitation of CVE-2022-50775 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2022-50775, GHSA-87wj-m7w2-v2mf, UBUNTU-CVE-2022-50775.