Review reviewHigh

CVE-2023-53828

Linux

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.

CVSS: 7.8
EPSS: 0.17%
CISA KEV: Not listed
Published: 2025.12.10

PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV

Exploit probability0.17%

Technical severityCVSS 7.8

Vulnerability overview

Affected product and versions

Product: Linux
Affected versions: >= b747a83690c8f53bc7a3f75899415c699b2c51aa < 81d8e9f59df63b8358751c1ffed9f1cf5c796909, >= b747a83690c8f53bc7a3f75899415c699b2c51aa < aafda69d4807f5edf3558c9534be9b911774e63a, >= b747a83690c8f53bc7a3f75899415c699b2c51aa < 8d66f7ced51cb924bc90278d6a0a26a52877271a, >= b747a83690c8f53bc7a3f75899415c699b2c51aa < a2bcd2b63271a93a695fabbfbf459c603d956d48, >= 6.0
Fixed versions: No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

1
Identify
Confirm that Linux and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE: Not available