CVE-2023-54210 (GCVE-0-2023-54210)

Vulnerability from cvelistv5 – Published: 2025-12-30 12:11 – Updated: 2026-10-15 21:41
VLAI
Title
Bluetooth: hci_sync: Avoid use-after-free in dbg for hci_remove_adv_monitor()
Summary
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.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-15 21:39 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7018 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 7cf5c2978f23fdbb2dd7b4e8b07e362ae2d8211c , < 0d4d6b083da9b033ddccef72d77f373c819ae3ea (git)
Affected: 7cf5c2978f23fdbb2dd7b4e8b07e362ae2d8211c , < bf00c2c8f6254f44ac041aa9a311ae9e0caf692b (git)
Affected: 7cf5c2978f23fdbb2dd7b4e8b07e362ae2d8211c , < de6dfcefd107667ce2dbedf4d9337f5ed557a4a1 (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.0
Unaffected: 0 , < 6.0 (semver)
Unaffected: 6.1.42 , ≤ 6.1.* (semver)
Unaffected: 6.4.7 , ≤ 6.4.* (semver)
Unaffected: 6.5 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_sync: Avoid use-after-free in dbg for hci_remove_adv_monitor()\n\nKASAN reports that there\u0027s a use-after-free in\nhci_remove_adv_monitor(). Trawling through the disassembly, you can\nsee that the complaint is from the access in bt_dev_dbg() under the\nHCI_ADV_MONITOR_EXT_MSFT case. The problem case happens because\nmsft_remove_monitor() can end up freeing the monitor\nstructure. Specifically:\n  hci_remove_adv_monitor() -\u003e\n  msft_remove_monitor() -\u003e\n  msft_remove_monitor_sync() -\u003e\n  msft_le_cancel_monitor_advertisement_cb() -\u003e\n  hci_free_adv_monitor()\n\nLet\u0027s fix the problem by just stashing the relevant data when it\u0027s\nstill valid."
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              "value": "AV:L - The vulnerable code is reached only through a local `AF_BLUETOOTH` HCI control socket carrying `MGMT_OP_REMOVE_ADV_MONITOR` (or via bluetoothd acting on a local D-Bus client); no Bluetooth peer, radio frame, or network packet participates in triggering the free-then-read.\nAC:L - The attacker deterministically drives the sequence by adding an advertisement monitor and then removing it \u2014 no race must be won, and on MSFT-capable controllers (Intel/Realtek/Qualcomm/MediaTek, i.e. most real hardware) the offending branch is the default path.\nPR:L - The mgmt handler nominally requires a trusted socket, but on stock Linux/ChromeOS systems an unprivileged local user drives the exact same add/remove monitor sequence through BlueZ\u0027s AdvertisementMonitorManager1 D-Bus interface, and monitors are auto-removed when the unprivileged client disconnects.\nUI:N - The attacking process performs the register/unregister sequence itself; no victim action, mount, or file open is needed.\nS:U - The freed object, the stale read, and the resulting impact all live in the kernel\u0027s own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - This is a use-after-free read of a freed slab object whose contents can be groomed during the sleeping `msft_remove_addr_filters_sync()` window, and the recycled heap contents are emitted into the kernel log \u2014 a repeatable heap-disclosure primitive usable against KASLR.\nI:H - Use-after-free of a `struct adv_monitor` with an attacker-influenceable reallocation window is a memory-corruption class defect; the dangling reference to a reclaimed slab object is the standard building block for heap-spray driven corruption.\nA:H - Dereferencing the freed monitor oopses the kernel when the backing slab page has been returned to the page allocator or under KASAN/panic_on_warn, and the sequence can be repeated at will to crash the system."
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      "title": "Bluetooth: hci_sync: Avoid use-after-free in dbg for hci_remove_adv_monitor()",
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    "dateReserved": "2025-12-30T12:06:44.500Z",
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            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_sync: Avoid use-after-free in dbg for hci_remove_adv_monitor()\n\nKASAN reports that there\u0027s a use-after-free in\nhci_remove_adv_monitor(). Trawling through the disassembly, you can\nsee that the complaint is from the access in bt_dev_dbg() under the\nHCI_ADV_MONITOR_EXT_MSFT case. The problem case happens because\nmsft_remove_monitor() can end up freeing the monitor\nstructure. Specifically:\n  hci_remove_adv_monitor() -\u003e\n  msft_remove_monitor() -\u003e\n  msft_remove_monitor_sync() -\u003e\n  msft_le_cancel_monitor_advertisement_cb() -\u003e\n  hci_free_adv_monitor()\n\nLet\u0027s fix the problem by just stashing the relevant data when it\u0027s\nstill valid."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nBluetooth: hci_sync: Evitar uso despu\u00e9s de liberaci\u00f3n en dbg para hci_remove_adv_monitor()\n\nKASAN informa que hay un uso despu\u00e9s de liberaci\u00f3n en\nhci_remove_adv_monitor(). Revisando el desensamblado, se puede\nver que la queja proviene del acceso en bt_dev_dbg() bajo el\ncaso HCI_ADV_MONITOR_EXT_MSFT. El caso problem\u00e1tico ocurre porque\nmsft_remove_monitor() puede terminar liberando la estructura del monitor.\nEspec\u00edficamente:\n  hci_remove_adv_monitor()   -\u003e  \n  msft_remove_monitor()   -\u003e  \n  msft_remove_monitor_sync()   -\u003e  \n  msft_le_cancel_monitor_advertisement_cb()   -\u003e  \n  hci_free_adv_monitor()\n\nVamos a solucionar el problema simplemente guardando los datos relevantes cuando a\u00fan son v\u00e1lidos."
          }
        ],
        "id": "CVE-2023-54210",
        "lastModified": "2026-10-28T19:10:00.193",
        "metrics": {
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                "scope": "UNCHANGED",
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                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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        "published": "2025-12-30T13:16:09.197",
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      "cve": "CVE-2023-54210",
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      "product_status:known_affected": "122",
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      "source": "Red Hat CSAF VEX",
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      "title": "kernel: Bluetooth: hci_sync: Avoid use-after-free in dbg for hci_remove_adv_monitor()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-54210.json",
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}



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