CVE-2023-53828

Bluetooth: hci_sync: Avoid use-after-free in dbg for hci_add_adv_monitor()

State: Published
Severity: 7.8 High
Published: Dec 9, 2025
Updated: Oct 15, 2026
Reserved: Dec 9, 2025

Description

In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: hci_sync: Avoid use-after-free in dbg for hci_add_adv_monitor()

KSAN reports use-after-free in hci_add_adv_monitor().

While adding an adv monitor, hci_add_adv_monitor() calls -> msft_add_monitor_pattern() calls -> msft_add_monitor_sync() calls -> msft_le_monitor_advertisement_cb() calls in an error case -> hci_free_adv_monitor() which frees the *moniter.

This is referenced by bt_dev_dbg() in hci_add_adv_monitor().

Fix the bt_dev_dbg() by using handle instead of monitor->handle.

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	b747a83690c8f53bc7a3f75899415c699b2c51aa to before 81d8e9f59df63b8358751c1ffed9f1cf5c796909Affected b747a83690c8f53bc7a3f75899415c699b2c51aa to before aafda69d4807f5edf3558c9534be9b911774e63aAffected b747a83690c8f53bc7a3f75899415c699b2c51aa to before 8d66f7ced51cb924bc90278d6a0a26a52877271aAffected b747a83690c8f53bc7a3f75899415c699b2c51aa to before a2bcd2b63271a93a695fabbfbf459c603d956d48Affected
LinuxLinux	6.0Affected before 6.0Not affected 6.1.53 through 6.1.Not affected 6.4.16 through 6.4.Not affected 6.5.3 through 6.5.*Not affected 6.6 and laterNot affected

References

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