CVE-2023-54210
Bluetooth: hci_sync: Avoid use-after-free in dbg for hci_remove_adv_monitor()
Reported by linux · Published December 30, 2025
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.
Fixed versions
Upgrade to a fixed version or later. Language registries are listed first, then Linux distributions, then vendor products.
| Package | Ecosystem | Fixed in |
|---|---|---|
| Linux | Linux | de6dfcefd107667ce2dbedf4d9337f5ed557a4a1, bf00c2c8f6254f44ac041aa9a311ae9e0caf692b, 0d4d6b083da9b033ddccef72d77f373c819ae3ea |
Risk scores
Affected products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | 7cf5c2978f23fdbb2dd7b4e8b07e362ae2d8211c, 7cf5c2978f23fdbb2dd7b4e8b07e362ae2d8211c, 7cf5c2978f23fdbb2dd7b4e8b07e362ae2d8211c |
| Linux | Linux | 6.0, 0, 6.1.42 |
| Linux | Linux | 6.5, 0, 6.1.42 |
| linux | linux_kernel | 6.0, 6.0, 6.0 |
Timeline
- Dec 30, 2025 CVE Published
- Dec 31, 2025 EPSS Score (30 in total, the first dated here)
- Jun 2, 2026 Security Advisory (25 in total, the first dated here)
- Jul 27, 2026 Coalition ESS Score
- Sep 30, 2026 CVE Updated
- Oct 4, 2026 Distribution Patch (24 in total, the first dated here)
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