CVE-2026-45888
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Memory Leak in Linux Kernel RAID1 md/raid1

Publication date: 2026-05-27

Last updated on: 2026-05-27

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: md/raid1: fix memory leak in raid1_run() raid1_run() calls setup_conf() which registers a thread via md_register_thread(). If raid1_set_limits() fails, the previously registered thread is not unregistered, resulting in a memory leak of the md_thread structure and the thread resource itself. Add md_unregister_thread() to the error path to properly cleanup the thread, which aligns with the error handling logic of other paths in this function. Compile tested only. Issue found using a prototype static analysis tool and code review.
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Meta Information
Published
2026-05-27
Last Modified
2026-05-27
Generated
2026-06-16
AI Q&A
2026-05-27
EPSS Evaluated
2026-06-15
NVD
CVE-2026-45888
EUVD
EUVD-2026-32354
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *
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Exploitability
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KEV
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CWE ID Description
CWE-UNKNOWN
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Mitigation Strategies

The vulnerability is fixed by adding md_unregister_thread() to the error path in the raid1_run() function to properly clean up the thread and prevent memory leaks.

To mitigate this vulnerability, you should update your Linux kernel to a version that includes this fix.

Executive Summary

This vulnerability is a memory leak in the Linux kernel's RAID1 implementation. Specifically, in the function raid1_run(), a thread is registered via md_register_thread(). If the function raid1_set_limits() fails afterward, the previously registered thread is not properly unregistered, causing a memory leak of the md_thread structure and the thread resource.

The fix involves adding a call to md_unregister_thread() in the error handling path to ensure the thread is cleaned up properly, aligning with the error handling logic used elsewhere in the function.

Impact Analysis

This vulnerability can lead to a memory leak in systems using the Linux kernel's RAID1 functionality. Over time, the leaked memory and thread resources could accumulate, potentially degrading system performance or stability.

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