CVE-2026-93205

/// Technical 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.

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References