CVE-2025-21833 iommu/vt-d: Avoid use of NULL after WARN_ON_ONCE
A null pointer dereference in the Linux kernel IOMMU driver can cause a system crash when a specific error condition occurs.
- 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-2025-21833?
CVE-2025-21833 is a medium-severity vulnerability in Linux kernel, published on 6 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:
iommu/vt-d: Avoid use of NULL after WARN_ON_ONCE
There is a WARN_ON_ONCE to catch an unlikely situation when domain_remove_dev_pasid can't find the `pasid`. In case it nevertheless happens we must avoid using a NULL pointer.
Weakness: CWE-476
Which versions are affected by CVE-2025-21833?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2025-21833?
Apply the vendor's patch.
Is CVE-2025-21833 being exploited?
There is no known exploitation of CVE-2025-21833 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-59100, AZL-59126, BELL-CVE-2025-21833, DEBIAN-CVE-2025-21833, GHSA-c8w4-q7v8-687p, ROOT-OS-DEBIAN-13-CVE-2025-21833 and 3 more.