CVE-2025-71071 iommu/mediatek: fix use-after-free on probe deferral
A use-after-free vulnerability in the Linux kernel's MediaTek IOMMU driver allows attackers to potentially execute code or escalate privileges via probe deferral.
- 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-2025-71071?
CVE-2025-71071 is a high-severity use after free vulnerability in Linux kernel, published on 13 Jan 2026. 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/mediatek: fix use-after-free on probe deferral
The driver is dropping the references taken to the larb devices during probe after successful lookup as well as on errors. This can potentially lead to a use-after-free in case a larb device has not yet been bound to its driver so that the iommu driver probe defers.
Fix this by keeping the references as expected while the iommu driver is bound.
Weakness: CWE-416
Which versions are affected by CVE-2025-71071?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2025-71071?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2025-71071 being exploited?
There is no known exploitation of CVE-2025-71071 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2025-71071, DEBIAN-CVE-2025-71071, GHSA-m2f3-4p6h-4879, ROOT-OS-DEBIAN-12-CVE-2025-71071, ROOT-OS-DEBIAN-13-CVE-2025-71071, ROOT-OS-UBUNTU-2404-CVE-2025-71071 and 1 more.