CVE-2026-93205
Received Received - Intake

Memory Leak in Linux Kernel IOMMU/arm-smmu-v3 Driver

Publication date: 2026-09-24

Last updated on: 2026-09-24

Assigner: kernel.org

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.

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Meta Information

Published
2026-09-24
Last Modified
2026-09-24
Generated
2026-09-25
AI Q&A
2026-09-24
EPSS Evaluated
N/A
NVD
CVE-2026-93205
EUVD
EUVD-2026-85934

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *

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Exploitability

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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability in the Linux kernel involves incorrect cleanup during device removal in the ARM SMMU v3 IOMMU driver. The issue occurs because the IOPF queue is freed before the event-queue IRQ handler, which still uses it. The fix uses devm to manage teardown, ensuring proper cleanup order.

Detection Guidance

This vulnerability is specific to the Linux kernel's arm-smmu-v3 IOMMU driver and may not have direct network detection methods. Check kernel logs for arm-smmu-v3 related errors or crashes using: dmesg | grep arm-smmu-v3. Verify if the system uses affected kernel versions with uname -a.

Impact Analysis

This vulnerability could lead to system instability or crashes if the ARM SMMU v3 device is removed while the IOPF queue is still in use. It may cause kernel panics or unexpected behavior in systems relying on IOMMU functionality.

Compliance Impact

This vulnerability does not directly affect compliance with GDPR, HIPAA, or similar standards. It is a Linux kernel memory management issue that could lead to system instability or crashes but does not involve data breaches or unauthorized access to sensitive information.

Mitigation Strategies

Apply the latest kernel update from your distribution to patch the arm-smmu-v3 driver issue. If immediate patching is not possible, avoid using IOMMU features or isolate affected systems until patched. Monitor vendor advisories for kernel updates addressing this flaw.

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