CVE-2026-43224
Analyzed Analyzed - Analysis Complete
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.
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Meta Information
Published
2026-05-06
Last Modified
2026-05-08
Generated
2026-06-16
AI Q&A
2026-05-06
EPSS Evaluated
2026-06-14
NVD
CVE-2026-43224
EUVD
EUVD-2026-27785
Affected Vendors & Products
Showing 2 associated CPEs
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
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KEV
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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.
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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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