Use-After-Free Crash in Linux dmaengine idxd Driver

Publication date: 2026-04-22

Last updated on: 2026-05-07

Assigner: kernel.org

Description

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.

CVSS Scores

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Meta Information

Published

2026-04-22

Last Modified

2026-05-07

Generated

2026-07-06

AI Q&A

2026-04-22

EPSS Evaluated

2026-07-05

NVD

CVE-2026-31443

EUVD

EUVD-2026-24775

Affected Vendors & Products

Vendor	Product	Version / Range
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	From 6.19 (inc) to 6.19.11 (exc)
linux	linux_kernel	From 6.14 (inc) to 6.18.21 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-UNKNOWN

Attack-Flow Graph

Executive Summary

This vulnerability exists in the Linux kernel's dmaengine idxd driver. It occurs when the hardware does not support reporting errors to the event log, and an error causing a Function Level Reset (FLR) is received. In this case, the driver incorrectly attempts to restore the event log even though it was never allocated, which can lead to a crash. Additionally, the driver may try to free the event log without verifying if it was properly allocated.

Impact Analysis

This vulnerability can cause the Linux kernel to crash when certain hardware errors occur and the event log is disabled or unsupported. Such crashes can lead to system instability, unexpected downtime, and potential loss of data or service availability.

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