CVE-2026-93205 iommu/arm-smmu-v3: Manage teardown with devm
A use-after-free vulnerability in the Linux kernel ARM SMMUv3 driver allows local attackers to cause denial of service or execute arbitrary code due to incorrect resource teardown order.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-93205?
CVE-2026-93205 is an use after free vulnerability in Linux, published on 24 Sep 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/arm-smmu-v3: Manage teardown with devm
arm_smmu_device_remove() manually frees the IOPF queue, destroys the vmid_map and disables the device, while the IRQs and queues are devm managed. devm unwinds only after remove() returns, so the cleanup runs in the wrong order. The IOPF queue is freed before the event-queue IRQ whose handler uses it.
Manage all of it with devm so the unwind order is correct. Free the IOPF queue and vmid_map via devm actions, and disable the device from one registered after arm_smmu_device_reset().
This is also a prerequisite for fixing a Tegra241 CMDQV CMD_SYNC use-after-free in the subsequent patch.
Which versions are affected by CVE-2026-93205?
How do I fix CVE-2026-93205?
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-2026-93205 being exploited?
There is no known exploitation of CVE-2026-93205 in the wild and no public exploit code.
Sources
Also known as AZL-103688, BELL-CVE-2026-93205, DEBIAN-CVE-2026-93205, GHSA-7g45-qp7m-q8xg, UBUNTU-CVE-2026-93205.