CVE-2026-43174 io_uring/zcrx: fix post open error handling
A use-after-free vulnerability in the Linux kernel's io_uring zero-copy receive path allows local attackers to potentially execute 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-2026-43174?
CVE-2026-43174 is a medium-severity use after free vulnerability in Linux kernel, published on 6 May 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 post open error handling
Closing a queue doesn't guarantee that all associated page pools are terminated right away, let the refcounting do the work instead of releasing the zcrx ctx directly.
Which versions are affected by CVE-2026-43174?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-43174?
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-2026-43174 being exploited?
There is no known exploitation of CVE-2026-43174 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-43174, DEBIAN-CVE-2026-43174, GHSA-m3w5-78ch-j8hg, UBUNTU-CVE-2026-43174.