CVE-2025-21882 net/mlx5: Fix vport QoS cleanup on error
A memory leak in the Linux kernel's mlx5 driver during vport QoS error handling can lead to resource exhaustion 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-2025-21882?
CVE-2025-21882 is a high-severity denial of service vulnerability in Linux kernel, published on 27 Mar 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:
net/mlx5: Fix vport QoS cleanup on error
When enabling vport QoS fails, the scheduling node was never freed, causing a leak.
Add the missing free and reset the vport scheduling node pointer to NULL.
Weakness: CWE-401
Which versions are affected by CVE-2025-21882?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2025-21882?
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-2025-21882 being exploited?
There is no known exploitation of CVE-2025-21882 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2025-21882, GHSA-mrwq-3cq2-5j36, UBUNTU-CVE-2025-21882.