CVE-2024-26814 vfio/fsl-mc: Block calling interrupt handler without trigger
A null pointer dereference in the Linux kernel vfio/fsl-mc driver allows local attackers to cause a 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-2024-26814?
CVE-2024-26814 is a medium-severity vulnerability in Debian Debian Linux, published on 5 Apr 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:
vfio/fsl-mc: Block calling interrupt handler without trigger
The eventfd_ctx trigger pointer of the vfio_fsl_mc_irq object is initially NULL and may become NULL if the user sets the trigger eventfd to -1. The interrupt handler itself is guaranteed that trigger is always valid between request_irq() and free_irq(), but the loopback testing mechanisms to invoke the handler function need to test the trigger. The triggering and setting ioctl paths both make use of igate and are therefore mutually exclusive.
The vfio-fsl-mc driver does not make use of irqfds, nor does it support any sort of masking operations, therefore unlike vfio-pci and vfio-platform, the flow can remain essentially unchanged.
Weakness: CWE-476
Which versions are affected by CVE-2024-26814?
It affects 2 products.
Products include Debian Debian Linux, Linux kernel.
How do I fix CVE-2024-26814?
Apply the vendor's patch.
Is CVE-2024-26814 being exploited?
There is no known exploitation of CVE-2024-26814 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as AZL-59264, BELL-CVE-2024-26814, DEBIAN-CVE-2024-26814, GHSA-rm2h-rx39-6fc3, UBUNTU-CVE-2024-26814.