CVE-2023-53719 serial: arc_uart: fix of_iomap leak in `arc_serial_probe`
A resource leak in the Linux kernel's arc_uart driver can lead to memory exhaustion and denial of service if port addition fails.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2023-53719?
CVE-2023-53719 is a denial of service vulnerability in Linux, published on 22 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:
serial: arc_uart: fix of_iomap leak in `arc_serial_probe`
Smatch reports:
drivers/tty/serial/arc_uart.c:631 arc_serial_probe() warn: 'port->membase' from of_iomap() not released on lines: 631.
In arc_serial_probe(), if uart_add_one_port() fails, port->membase is not released, which would cause a resource leak.
To fix this, I replace of_iomap with devm_platform_ioremap_resource.
Which versions are affected by CVE-2023-53719?
How do I fix CVE-2023-53719?
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-2023-53719 being exploited?
There is no known exploitation of CVE-2023-53719 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2023-53719, DEBIAN-CVE-2023-53719, GHSA-8c85-w2xh-8gcf, UBUNTU-CVE-2023-53719.