CVE-2023-54030 io_uring/net: don't overflow multishot recv
A local attacker can cause a denial of service or out-of-memory condition in the Linux kernel by overflowing multishot recv CQEs in io_uring.
- 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-2023-54030?
CVE-2023-54030 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:
io_uring/net: don't overflow multishot recv
Don't allow overflowing multishot recv CQEs, it might get out of hand, hurt performance, and in the worst case scenario OOM the task.
Which versions are affected by CVE-2023-54030?
How do I fix CVE-2023-54030?
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-2023-54030 being exploited?
There is no known exploitation of CVE-2023-54030 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2023-54030, DEBIAN-CVE-2023-54030, GHSA-43mh-5pcq-96hp, ROOT-OS-DEBIAN-12-CVE-2023-54030, UBUNTU-CVE-2023-54030.