CVE-2026-43022
Analyzed Analyzed - Analysis Complete
Bluetooth: hci_cmd_sync_queue_once() Race Condition 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: hci_cmd_sync_queue_once() return -EEXIST if exists hci_cmd_sync_queue_once() needs to indicate whether a queue item was added, so caller can know if callbacks are called, so it can avoid leaking resources. Change the function to return -EEXIST if queue item already exists. Modify all callsites to handle that.
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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-2026-43022
EUVD
EUVD-2026-26621
Affected Vendors & Products
Showing 10 associated CPEs
Vendor Product Version / Range
linux linux_kernel 6.6.51
linux linux_kernel 6.1.120
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 6.9 (inc) to 6.19.12 (exc)
linux linux_kernel 6.8.9
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-UNKNOWN
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Executive Summary

This vulnerability exists in the Linux kernel's Bluetooth subsystem, specifically in the function hci_cmd_sync_queue_once(). The function did not properly indicate whether a queue item was added, which could cause the caller to be unaware if callbacks were called, potentially leading to resource leaks.

The fix changes the function to return -EEXIST if the queue item already exists, allowing the caller to handle this case properly and avoid leaking resources.

Impact Analysis

If exploited or triggered, this vulnerability could cause resource leaks in the Bluetooth subsystem of the Linux kernel. Resource leaks may degrade system performance or stability over time, potentially leading to crashes or denial of service conditions.

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