CVE-2026-45888

Analyzed Analyzed - Analysis Complete

Memory Leak in Linux Kernel RAID1 md/raid1

Publication date: 2026-05-27

Last updated on: 2026-06-25

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.

CVSS Scores

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Meta Information

Published

2026-05-27

Last Modified

2026-06-25

Generated

2026-07-06

AI Q&A

2026-05-27

EPSS Evaluated

2026-07-05

NVD

CVE-2026-45888

EUVD

EUVD-2026-32354

Affected Vendors & Products

Vendor	Product	Version / Range
linux	linux_kernel	From 6.13 (inc) to 6.18.14 (exc)
linux	linux_kernel	From 6.19 (inc) to 6.19.4 (exc)
linux	linux_kernel	From 6.9 (inc) to 6.12.75 (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

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.

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.

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