io_uring zcrx sgtable leak in Linux kernel

Publication date: 2026-05-06

Last updated on: 2026-05-08

Assigner: kernel.org

Description

In the Linux kernel, the following vulnerability has been resolved: io_uring/zcrx: fix sgtable leak on mapping failures In an unlikely case when io_populate_area_dma() fails, which could only happen on a PAGE_POOL_32BIT_ARCH_WITH_64BIT_DMA machine, io_zcrx_map_area() will have an initialised and not freed table. It was supposed to be cleaned up in the error path, but !is_mapped prevents that.

CVSS Scores

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Meta Information

Published

2026-05-06

Last Modified

2026-05-08

Generated

2026-07-06

AI Q&A

2026-05-06

EPSS Evaluated

2026-07-05

NVD

CVE-2026-43224

EUVD

EUVD-2026-27785

Affected Vendors & Products

Vendor	Product	Version / Range
linux	linux_kernel	From 6.19 (inc) to 6.19.6 (exc)
linux	linux_kernel	From 6.18 (inc) to 6.18.16 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-401	The product does not sufficiently track and release allocated memory after it has been used, making the memory unavailable for reallocation and reuse.

Attack-Flow Graph

Impact Analysis

The impact of this vulnerability is a resource leak in the Linux kernel's io_uring subsystem. Specifically, memory allocated for the scatter-gather table may not be freed properly on certain hardware architectures when an error occurs. Over time, this could lead to increased memory usage and potential system instability or degraded performance.

Executive Summary

This vulnerability exists in the Linux kernel's io_uring subsystem, specifically in the io_zcrx_map_area() function. When the function io_populate_area_dma() fails on certain machines (PAGE_POOL_32BIT_ARCH_WITH_64BIT_DMA), a scatter-gather table (sgtable) is initialized but not properly freed due to a logic condition (!is_mapped) that prevents cleanup in the error path. This results in a resource leak.

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