CVE-2026-98004

Received Received - Intake

Serialize IOMMU Command Queue Publishing in Linux Kernel

Publication date: 2026-09-25

Last updated on: 2026-10-15

Assigner: kernel.org

Description

In the Linux kernel, the following vulnerability has been resolved: iommu/riscv: Serialize command queue publishing Serialize command queue publishing so software producer state advances only after a command is written and the hardware tail is updated. Wait for hardware consumption outside the queue lock when the command queue is full so other CPUs are not blocked behind a long poll.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-09-25

Last Modified

2026-10-15

Generated

2026-10-15

AI Q&A

2026-09-25

EPSS Evaluated

2026-10-14

NVD

CVE-2026-98004

EUVD

EUVD-2026-86657

Affected Vendors & Products

Vendor	Product	Version / Range
linux	linux_kernel	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-UNKNOWN

Attack-Flow Graph

Executive Summary

This vulnerability in the Linux kernel involves improper synchronization in the RISC-V IOMMU command queue. It allows software to advance its state before the hardware processes commands, potentially leading to race conditions or command loss.

Detection Guidance

This vulnerability is specific to the Linux kernel's IOMMU subsystem for RISC-V architectures. Detection requires checking kernel logs for IOMMU-related errors or inspecting the kernel version for affected builds. Commands like 'dmesg | grep -i iommu' or 'uname -a' may help identify potential exposure.

Impact Analysis

The vulnerability could cause system instability or crashes if commands are lost or processed out of order. It may also lead to performance degradation due to unnecessary blocking of CPUs waiting for queue space.

Compliance Impact

This vulnerability does not directly affect compliance with GDPR, HIPAA, or similar standards. It is a low-level kernel issue related to IOMMU command queue serialization in the Linux kernel, which does not impact data protection, privacy, or security controls required by these regulations.

Mitigation Strategies

Update the Linux kernel to the latest patched version to resolve the IOMMU command queue serialization issue.

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