CVE-2026-74355 iommu/vt-d: Fix RB-tree corruption in probe error path
A flaw in the Linux kernel's IOMMU driver allows memory corruption during device probe failures, potentially leading to system crashes or arbitrary code execution.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-74355?
CVE-2026-74355 is a high-severity memory corruption 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:
iommu/vt-d: Fix RB-tree corruption in probe error path
The info->node RB-tree member is zero-initialized via kzalloc. If a device does not support ATS, the device_rbtree_insert() call is skipped. If a subsequent probe step fails, the error path jumps to device_rbtree_remove(), which misinterprets the zeroed node as a tree root and corrupts the device RB-tree.
Fix this by explicitly initializing the RB-node as empty using RB_CLEAR_NODE() during initialization and guarding the removal with RB_EMPTY_NODE().
Which versions are affected by CVE-2026-74355?
How do I fix CVE-2026-74355?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-74355 being exploited?
There is no known exploitation of CVE-2026-74355 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-74355, DEBIAN-CVE-2026-74355, GHSA-444c-98p8-5jq5, UBUNTU-CVE-2026-74355.