CVE-2026-74328 iommufd: Destroy the pages content after detaching from dmabuf
A use-after-free vulnerability in the Linux kernel's iommufd subsystem allows attackers to potentially execute code or escalate privileges via improper page destruction during dmabuf detachment.
- 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-2026-74328?
CVE-2026-74328 is a high-severity use after free vulnerability in Linux, published on 15 Aug 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:
iommufd: Destroy the pages content after detaching from dmabuf
Sashiko points out this has gotten out of order, the mutex could still be in use through the dmabuf invalidation callbacks. Don't destroy any of the pages content until the dmabuf is fully detached.
Which versions are affected by CVE-2026-74328?
How do I fix CVE-2026-74328?
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-2026-74328 being exploited?
There is no known exploitation of CVE-2026-74328 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-74328, GHSA-32j6-f9xj-w83j, UBUNTU-CVE-2026-74328.