CVE-2026-68347

kernel: iommu/amd: Fix IRQ unsafe locking in gdom allocation

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Severity

Moderate

Red Hat Product Security

5.5

CVSS 3.1

Review impact separately from score.

Published · August 10, 2026

Updated · October 30, 2026

Description

A flaw was found in the Linux kernel's AMD IOMMU (Input/Output Memory Management Unit) driver. This vulnerability is caused by an unsafe lock order during the allocation of graphics domains (gdom) and within the IOMMU_DESTROY free path. This issue could lead to a system crash or a denial of service (DoS) due to a kernel concurrency problem.

Statement

This issue affects AMD IOMMU. gdom allocation takes mutex in IRQ-unsafe context triggering lockdep and potential deadlock. Systems without AMD IOMMU are not affected.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 5.5
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CWE-833 · Deadlock