CVE-2023-52926 io_uring/rw: split io_read() into a helper
A use-after-free vulnerability in the Linux kernel's io_uring subsystem allows attackers to potentially execute arbitrary code or escalate privileges.
- 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-2023-52926?
CVE-2023-52926 is a high-severity use after free vulnerability in Linux kernel, published on 24 Feb 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:
IORING_OP_READ did not correctly consume the provided buffer list when read i/o returned < 0 (except for -EAGAIN and -EIOCBQUEUED return). This can lead to a potential use-after-free when the completion via io_rw_done runs at separate context.
Weakness: CWE-416
Which versions are affected by CVE-2023-52926?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2023-52926?
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-2023-52926 being exploited?
There is no known exploitation of CVE-2023-52926 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2023-52926, DEBIAN-CVE-2023-52926, GHSA-mq8h-f329-fxx2, ROOT-OS-DEBIAN-11-CVE-2023-52926, ROOT-OS-UBUNTU-2204-CVE-2023-52926, UBUNTU-CVE-2023-52926.