CVE-2026-31443: dmaengine: idxd: Fix crash when the event log is disabled

Q: Which systems are exposed to this crash?

Systems using the Linux kernel idxd dmaengine driver are affected when the hardware does not support reporting errors to the event log and an error triggers a Function Level Reset (FLR).

Q: What conditions are required to trigger the issue?

The affected device must have event-log error reporting unsupported or disabled, and it must receive an error that causes an FLR. The vulnerable driver then attempts to restore an event log that was never allocated.

Q: What is the impact of successful triggering?

The issue can cause a kernel crash, resulting in a denial of service. The supplied CVSS vector indicates local access and low privileges are required, with no user interaction.

Q: What should be done if patching cannot be performed immediately?

The provided data identifies the unsafe condition as operation with event-log reporting unavailable and an error causing FLR, but it does not provide a documented workaround. Apply the available patch when possible.

Published Apr 22, 2026

Updated

In the Linux kernel, the following vulnerability has been resolved:

dmaengine: idxd: Fix crash when the event log is disabled

If reporting errors to the event log is not supported by the hardware, and an error that causes Function Level Reset (FLR) is received, the driver will try to restore the event log even if it was not allocated.

Also, only try to free the event log if it was properly allocated.

Affected Software

8 affected components

Linux Linux kernel (idxd dmaengine driver)

Linux Linux kernel>=6.14<6.18.21

Linux Linux kernel>=6.19<6.19.11

Linux Linux kernel=7.0-rc1

Linux Linux kernel=7.0-rc2

Linux Linux kernel=7.0-rc3

Linux Linux kernel=7.0-rc4

Linux Linux kernel=7.0-rc5

Remediation

Event History

Apr 22, 2026

CVE Published

via MITRE·01:53 PM

Data Sourced

via MITRE·01:53 PM

Description

Data Sourced

via NVD·02:16 PM

RemedyDescriptionSeverityAffected Software

Frequently Asked Questions

Which systems are exposed to this crash?

Systems using the Linux kernel idxd dmaengine driver are affected when the hardware does not support reporting errors to the event log and an error triggers a Function Level Reset (FLR).

What conditions are required to trigger the issue?

The affected device must have event-log error reporting unsupported or disabled, and it must receive an error that causes an FLR. The vulnerable driver then attempts to restore an event log that was never allocated.

What is the impact of successful triggering?

The issue can cause a kernel crash, resulting in a denial of service. The supplied CVSS vector indicates local access and low privileges are required, with no user interaction.

What should be done if patching cannot be performed immediately?

The provided data identifies the unsafe condition as operation with event-log reporting unavailable and an error causing FLR, but it does not provide a documented workaround. Apply the available patch when possible.

CVE-2026-31443: dmaengine: idxd: Fix crash when the event log is disabled

Affected Software

Remediation

Patch Available

Patch Available

Patch Available

Event History

Frequently Asked Questions

Which systems are exposed to this crash?

What conditions are required to trigger the issue?

What is the impact of successful triggering?

What should be done if patching cannot be performed immediately?

Company

Resources

Contact

Frequently Asked Questions

Which systems are exposed to this crash?

What conditions are required to trigger the issue?

What is the impact of successful triggering?

What should be done if patching cannot be performed immediately?