CVE-2026-43021
Analyzed Analyzed - Analysis Complete
Bluetooth: hci_sync Memory Leak in Linux Kernel

Publication date: 2026-05-01

Last updated on: 2026-05-08

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_sync: fix leaks when hci_cmd_sync_queue_once fails When hci_cmd_sync_queue_once() returns with error, the destroy callback will not be called. Fix leaking references / memory on these failures.
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Meta Information
Published
2026-05-01
Last Modified
2026-05-08
Generated
2026-06-16
AI Q&A
2026-05-01
EPSS Evaluated
2026-06-15
NVD
CVE-2026-43021
EUVD
EUVD-2026-26620
Affected Vendors & Products
Showing 7 associated CPEs
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 7.0
linux linux_kernel From 6.19 (inc) to 6.19.12 (exc)
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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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Executive Summary

This vulnerability exists in the Linux kernel's Bluetooth subsystem, specifically in the hci_sync component. When the function hci_cmd_sync_queue_once() fails and returns an error, a necessary destroy callback is not called. This results in leaking references or memory because the cleanup process is not properly executed on failure.

Impact Analysis

The impact of this vulnerability is primarily related to resource management. Because memory or references are leaked when the failure occurs, it can lead to increased memory usage and potentially degrade system performance or stability over time. In severe cases, this could cause system crashes or denial of service due to resource exhaustion.

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