CVE-2023-54210
Unknown Unknown - Not Provided
Use-After-Free in Linux Kernel Bluetooth hci_remove_adv_monitor

Publication date: 2025-12-30

Last updated on: 2025-12-30

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_sync: Avoid use-after-free in dbg for hci_remove_adv_monitor() KASAN reports that there's a use-after-free in hci_remove_adv_monitor(). Trawling through the disassembly, you can see that the complaint is from the access in bt_dev_dbg() under the HCI_ADV_MONITOR_EXT_MSFT case. The problem case happens because msft_remove_monitor() can end up freeing the monitor structure. Specifically: hci_remove_adv_monitor() -> msft_remove_monitor() -> msft_remove_monitor_sync() -> msft_le_cancel_monitor_advertisement_cb() -> hci_free_adv_monitor() Let's fix the problem by just stashing the relevant data when it's still valid.
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Meta Information
Published
2025-12-30
Last Modified
2025-12-30
Generated
2026-06-16
AI Q&A
2025-12-30
EPSS Evaluated
2026-06-15
NVD
CVE-2023-54210
EUVD
EUVD-2023-60431
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *
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Exploitability
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CWE ID Description
CWE-UNKNOWN
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Executive Summary

This vulnerability is a use-after-free issue in the Linux kernel's Bluetooth subsystem, specifically in the function hci_remove_adv_monitor(). The problem occurs because the monitor structure can be freed prematurely by msft_remove_monitor(), leading to invalid memory access when bt_dev_dbg() tries to use it. The fix involves preserving the relevant data while it is still valid to avoid accessing freed memory.

Impact Analysis

This use-after-free vulnerability could lead to system instability or crashes in the Linux kernel's Bluetooth functionality. It may also be exploitable to cause unexpected behavior or potentially escalate privileges, depending on how the freed memory is accessed or manipulated.

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