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

Vulnerability from cvelistv5 – Published: 2025-12-30 12:11 – Updated: 2026-08-05 09:18
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
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 7cf5c2978f23fdbb2dd7b4e8b07e362ae2d8211c , < 0d4d6b083da9b033ddccef72d77f373c819ae3ea (git)
Affected: 7cf5c2978f23fdbb2dd7b4e8b07e362ae2d8211c , < bf00c2c8f6254f44ac041aa9a311ae9e0caf692b (git)
Affected: 7cf5c2978f23fdbb2dd7b4e8b07e362ae2d8211c , < de6dfcefd107667ce2dbedf4d9337f5ed557a4a1 (git)
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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)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/hci_core.c"
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
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              "versionType": "git"
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              "versionType": "git"
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          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "6.0"
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              "status": "unaffected",
              "version": "0",
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              "versionType": "semver"
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              "version": "6.4.7",
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              "status": "unaffected",
              "version": "6.5",
              "versionType": "original_commit_for_fix"
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      "cpeApplicability": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.42",
                  "versionStartIncluding": "6.0",
                  "vulnerable": true
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              "negate": false,
              "operator": "OR"
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      "descriptions": [
        {
          "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "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."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T09:18:04.882Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/0d4d6b083da9b033ddccef72d77f373c819ae3ea"
        },
        {
          "url": "https://git.kernel.org/stable/c/bf00c2c8f6254f44ac041aa9a311ae9e0caf692b"
        },
        {
          "url": "https://git.kernel.org/stable/c/de6dfcefd107667ce2dbedf4d9337f5ed557a4a1"
        }
      ],
      "title": "Bluetooth: hci_sync: Avoid use-after-free in dbg for hci_remove_adv_monitor()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
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    "assignerShortName": "Linux",
    "cveId": "CVE-2023-54210",
    "datePublished": "2025-12-30T12:11:08.682Z",
    "dateReserved": "2025-12-30T12:06:44.500Z",
    "dateUpdated": "2026-08-05T09:18:04.882Z",
    "state": "PUBLISHED"
  },
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      "date": "2026-09-24",
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      "percentile": "0.02995"
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                ],
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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."
          }
        ],
        "id": "CVE-2023-54210",
        "lastModified": "2026-08-04T11:16:36.870",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
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                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Deferred"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-08-04T22:53:01+00:00",
      "cve": "CVE-2023-54210",
      "id": "CVE-2023-54210",
      "initial_release_date": "2023-01-01T00:00:00+00:00",
      "product_status:known_affected": "122",
      "product_status:known_not_affected": "152",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "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",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-09-19T02:44:18Z",
      "cve": "CVE-2023-54210",
      "id": "CVE-2023-54210",
      "initial_release_date": "2025-12-31T00:28:24Z",
      "product_status:known_affected": "374",
      "product_status:known_not_affected": "356",
      "product_status:recommended": "299",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2023-54210",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2023-54210.json",
      "version": "39"
    }
  }
}



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Nomenclature

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  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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