Bluetooth: hci_sync: Avoid use-after-free in dbg for hci_remove_adv_monitor() (CVE-2023-54210) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2023-54210

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

Answer in brief

CVE-2023-54210 records a Unknown severity vulnerability in Bluetooth: hci_sync: Avoid use-after-free in dbg for hci_remove_adv_monitor(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Dec 30, 2025Updated Aug 5, 2026Source checked Sep 19, 2026First seen by HOL Aug 5, 2026Material review Aug 5, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=7cf5c2978f23fdbb2dd7b4e8b07e362ae2d8211c <0d4d6b083da9b033ddccef72d77f373c819ae3ea \|\| >=7cf5c2978f23fdbb2dd7b4e8b07e362ae2d8211c <bf00c2c8f6254f44ac041aa9a311ae9e0caf692b \|\| >=7cf5c2978f23fdbb2dd7b4e8b07e362ae2d8211c <de6dfcefd107667ce2dbedf4d9337f5ed557a4a1	0d4d6b083da9b033ddccef72d77f373c819ae3ea, bf00c2c8f6254f44ac041aa9a311ae9e0caf692b, de6dfcefd107667ce2dbedf4d9337f5ed557a4a1
Linux/Linuxgeneric	6.0	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 0d4d6b083da9b033ddccef72d77f373c819ae3ea if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Dec 30, 2025
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 5, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.