CVE-2023-53643 nvme-tcp: don't access released socket during error recovery
A local attacker can cause a kernel crash by running 'nvme list' during NVMe TCP error recovery, leading to 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-2023-53643?
CVE-2023-53643 is a high-severity vulnerability in Linux kernel, published on 7 Oct 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:
nvme-tcp: don't access released socket during error recovery
While the error recovery work is temporarily failing reconnect attempts, running the 'nvme list' command causes a kernel NULL pointer dereference by calling getsockname() with a released socket.
During error recovery work, the nvme tcp socket is released and a new one created, so it is not safe to access the socket without proper check.
Weakness: CWE-476
Which versions are affected by CVE-2023-53643?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2023-53643?
Apply the vendor's patch.
Is CVE-2023-53643 being exploited?
There is no known exploitation of CVE-2023-53643 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2023-53643, DEBIAN-CVE-2023-53643, GHSA-wvjj-gc57-3w9j, UBUNTU-CVE-2023-53643.