CVE-2024-56763 tracing: Prevent bad count for tracing_cpumask_write
A local attacker can trigger a kernel warning and potential denial of service by providing a large count to the tracing_cpumask_write interface.
- 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-2024-56763?
CVE-2024-56763 is a medium-severity denial of service vulnerability in Linux kernel, published on 6 Jan 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:
tracing: Prevent bad count for tracing_cpumask_write
If a large count is provided, it will trigger a warning in bitmap_parse_user. Also check zero for it.
Which versions are affected by CVE-2024-56763?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2024-56763?
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-2024-56763 being exploited?
There is no known exploitation of CVE-2024-56763 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-55026, AZL-55097, BELL-CVE-2024-56763, DEBIAN-CVE-2024-56763, GHSA-vj55-2cxj-5mrc, UBUNTU-CVE-2024-56763.