CVE-2024-39475 fbdev: savage: Handle err return when savagefb_check_var failed
A missing error check in the Savage framebuffer driver allows a divide-by-zero error, causing a kernel crash and 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-2024-39475?
CVE-2024-39475 is a medium-severity denial of service vulnerability in Linux kernel, published on 5 Jul 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:
fbdev: savage: Handle err return when savagefb_check_var failed
The commit 04e5eac8f3ab("fbdev: savage: Error out if pixclock equals zero") checks the value of pixclock to avoid divide-by-zero error. However the function savagefb_probe doesn't handle the error return of savagefb_check_var. When pixclock is 0, it will cause divide-by-zero error.
Weakness: CWE-369
Which versions are affected by CVE-2024-39475?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2024-39475?
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-2024-39475 being exploited?
There is no known exploitation of CVE-2024-39475 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-43276, BELL-CVE-2024-39475, DEBIAN-CVE-2024-39475, GHSA-4h39-wwj7-hq2m, UBUNTU-CVE-2024-39475.