CVE-2025-37933 octeon_ep: Fix host hang issue during device reboot
A use-after-free bug in the octeon_ep driver causes a host hang during device reboot, requiring a kernel patch to prevent 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-2025-37933?
CVE-2025-37933 is a medium-severity use after free vulnerability in Linux kernel, published on 20 May 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:
octeon_ep: Fix host hang issue during device reboot
When the host loses heartbeat messages from the device, the driver calls the device-specific ndo_stop function, which frees the resources. If the driver is unloaded in this scenario, it calls ndo_stop again, attempting to free resources that have already been freed, leading to a host hang issue. To resolve this, dev_close should be called instead of the device-specific stop function.dev_close internally calls ndo_stop to stop the network interface and performs additional cleanup tasks. During the driver unload process, if the device is already down, ndo_stop is not called.
Weakness: CWE-415
Which versions are affected by CVE-2025-37933?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2025-37933?
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-2025-37933 being exploited?
There is no known exploitation of CVE-2025-37933 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2025-37933, DEBIAN-CVE-2025-37933, GHSA-q8rr-8fcc-gc56, ROOT-OS-UBUNTU-2404-CVE-2025-37933, UBUNTU-CVE-2025-37933.