CVE-2024-39292 um: Add winch to winch_handlers before registering winch IRQ
A race condition in the Linux kernel UML subsystem can cause a system panic when a winch IRQ is registered before the handler is added to the list.
- 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-2024-39292?
CVE-2024-39292 is a high-severity vulnerability in Linux kernel, published on 24 Jun 2024. 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:
um: Add winch to winch_handlers before registering winch IRQ
Registering a winch IRQ is racy, an interrupt may occur before the winch is added to the winch_handlers list.
If that happens, register_winch_irq() adds to that list a winch that is scheduled to be (or has already been) freed, causing a panic later in winch_cleanup().
Avoid the race by adding the winch to the winch_handlers list before registering the IRQ, and rolling back if um_request_irq() fails.
Weakness: CWE-415
Which versions are affected by CVE-2024-39292?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2024-39292?
Apply the vendor's patch.
Is CVE-2024-39292 being exploited?
There is no known exploitation of CVE-2024-39292 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-42889, AZL-42937, BELL-CVE-2024-39292, DEBIAN-CVE-2024-39292, GHSA-9338-v6x4-3wv5, UBUNTU-CVE-2024-39292.