CVE-2025-21690 scsi: storvsc: Ratelimit warning logs to prevent VM denial of service
Persistent hypervisor errors can flood kernel logs, causing high CPU usage and denying service to the virtual machine.
- 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-2025-21690?
CVE-2025-21690 is a medium-severity denial of service vulnerability in Linux kernel, published on 10 Feb 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:
scsi: storvsc: Ratelimit warning logs to prevent VM denial of service
If there's a persistent error in the hypervisor, the SCSI warning for failed I/O can flood the kernel log and max out CPU utilization, preventing troubleshooting from the VM side. Ratelimit the warning so it doesn't DoS the VM.
Weakness: CWE-770
Which versions are affected by CVE-2025-21690?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2025-21690?
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-2025-21690 being exploited?
There is no known exploitation of CVE-2025-21690 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-56949, AZL-57016, BELL-CVE-2025-21690, DEBIAN-CVE-2025-21690, GHSA-x7cw-79fv-35qf, ROOT-OS-DEBIAN-11-CVE-2025-21690 and 1 more.