CVE-2026-23263 io_uring/zcrx: fix page array leak
A memory leak in the Linux kernel's io_uring zero-copy receive path allows attackers to exhaust system memory, causing 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-2026-23263?
CVE-2026-23263 is a medium-severity memory corruption vulnerability in Linux kernel, published on 18 Mar 2026. 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/zcrx: fix page array leak
d9f595b9a65e ("io_uring/zcrx: fix leaking pages on sg init fail") fixed a page leakage but didn't free the page array, release it as well.
Weakness: CWE-401
Which versions are affected by CVE-2026-23263?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-23263?
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-2026-23263 being exploited?
There is no known exploitation of CVE-2026-23263 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-23263, DEBIAN-CVE-2026-23263, GHSA-3qg9-j2gc-w8g9, UBUNTU-CVE-2026-23263.