CVE-2023-54168 RDMA/mlx4: Prevent shift wrapping in set_user_sq_size()
A user-controlled shift operation in the Linux kernel RDMA driver can wrap, potentially causing undefined behavior or denial of service.
- 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-2023-54168?
CVE-2023-54168 is a high-severity 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:
RDMA/mlx4: Prevent shift wrapping in set_user_sq_size()
The ucmd->log_sq_bb_count variable is controlled by the user so this shift can wrap. Fix it by using check_shl_overflow() in the same way that it was done in commit 515f60004ed9 ("RDMA/hns: Prevent undefined behavior in hns_roce_set_user_sq_size()").
Which versions are affected by CVE-2023-54168?
How do I fix CVE-2023-54168?
Apply the vendor's patch.
Is CVE-2023-54168 being exploited?
There is no known exploitation of CVE-2023-54168 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2023-54168, DEBIAN-CVE-2023-54168, GHSA-54vr-v43g-gq47, UBUNTU-CVE-2023-54168.