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CVE-2023-53520 (GCVE-0-2023-53520)

Vulnerability from cvelistv5 – Published: 2025-10-01 11:46 – Updated: 2026-08-05 09:14
VLAI
Title
Bluetooth: Fix hci_suspend_sync crash
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: Fix hci_suspend_sync crash If hci_unregister_dev() frees the hci_dev object but hci_suspend_notifier may still be accessing it, it can cause the program to crash. Here's the call trace: <4>[102152.653246] Call Trace: <4>[102152.653254] hci_suspend_sync+0x109/0x301 [bluetooth] <4>[102152.653259] hci_suspend_dev+0x78/0xcd [bluetooth] <4>[102152.653263] hci_suspend_notifier+0x42/0x7a [bluetooth] <4>[102152.653268] notifier_call_chain+0x43/0x6b <4>[102152.653271] __blocking_notifier_call_chain+0x48/0x69 <4>[102152.653273] __pm_notifier_call_chain+0x22/0x39 <4>[102152.653276] pm_suspend+0x287/0x57c <4>[102152.653278] state_store+0xae/0xe5 <4>[102152.653281] kernfs_fop_write+0x109/0x173 <4>[102152.653284] __vfs_write+0x16f/0x1a2 <4>[102152.653287] ? selinux_file_permission+0xca/0x16f <4>[102152.653289] ? security_file_permission+0x36/0x109 <4>[102152.653291] vfs_write+0x114/0x21d <4>[102152.653293] __x64_sys_write+0x7b/0xdb <4>[102152.653296] do_syscall_64+0x59/0x194 <4>[102152.653299] entry_SYSCALL_64_after_hwframe+0x5c/0xc1 This patch holds the reference count of the hci_dev object while processing it in hci_suspend_notifier to avoid potential crash caused by the race condition.
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: 9952d90ea2885d7cbf80cd233f694f09a9c0eaec , < e1fa25a91091bbed691ba2996a6cee809e3309a2 (git)
Affected: 9952d90ea2885d7cbf80cd233f694f09a9c0eaec , < 06e2b5ad72b60f90bfe565c201346532e271f484 (git)
Affected: 9952d90ea2885d7cbf80cd233f694f09a9c0eaec , < f9c8ce5d665653e3cf71a76349d41d7a7f7947e6 (git)
Affected: 9952d90ea2885d7cbf80cd233f694f09a9c0eaec , < 573ebae162111063eedc6c838a659ba628f66a0f (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.7
Unaffected: 0 , < 5.7 (semver)
Unaffected: 5.15.199 , ≤ 5.15.* (semver)
Unaffected: 6.1.55 , ≤ 6.1.* (semver)
Unaffected: 6.5.5 , ≤ 6.5.* (semver)
Unaffected: 6.6 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/hci_core.c"
          ],
          "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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          "vendor": "Linux",
          "versions": [
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              "version": "5.7"
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              "version": "0",
              "versionType": "semver"
            },
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              "version": "5.15.199",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "6.1.55",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.5.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.6",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
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      "cpeApplicability": [
        {
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              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.199",
                  "versionStartIncluding": "5.7",
                  "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: Fix hci_suspend_sync crash\n\nIf hci_unregister_dev() frees the hci_dev object but hci_suspend_notifier\nmay still be accessing it, it can cause the program to crash.\nHere\u0027s the call trace:\n  \u003c4\u003e[102152.653246] Call Trace:\n  \u003c4\u003e[102152.653254]  hci_suspend_sync+0x109/0x301 [bluetooth]\n  \u003c4\u003e[102152.653259]  hci_suspend_dev+0x78/0xcd [bluetooth]\n  \u003c4\u003e[102152.653263]  hci_suspend_notifier+0x42/0x7a [bluetooth]\n  \u003c4\u003e[102152.653268]  notifier_call_chain+0x43/0x6b\n  \u003c4\u003e[102152.653271]  __blocking_notifier_call_chain+0x48/0x69\n  \u003c4\u003e[102152.653273]  __pm_notifier_call_chain+0x22/0x39\n  \u003c4\u003e[102152.653276]  pm_suspend+0x287/0x57c\n  \u003c4\u003e[102152.653278]  state_store+0xae/0xe5\n  \u003c4\u003e[102152.653281]  kernfs_fop_write+0x109/0x173\n  \u003c4\u003e[102152.653284]  __vfs_write+0x16f/0x1a2\n  \u003c4\u003e[102152.653287]  ? selinux_file_permission+0xca/0x16f\n  \u003c4\u003e[102152.653289]  ? security_file_permission+0x36/0x109\n  \u003c4\u003e[102152.653291]  vfs_write+0x114/0x21d\n  \u003c4\u003e[102152.653293]  __x64_sys_write+0x7b/0xdb\n  \u003c4\u003e[102152.653296]  do_syscall_64+0x59/0x194\n  \u003c4\u003e[102152.653299]  entry_SYSCALL_64_after_hwframe+0x5c/0xc1\n\nThis patch holds the reference count of the hci_dev object while\nprocessing it in hci_suspend_notifier to avoid potential crash\ncaused by the race condition."
        }
      ],
      "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 callback is only invoked from the kernel PM notifier chain (system suspend/resume initiated via /sys/power/state, logind, or lid/button events) racing with local HCI device unregistration; there is no over-the-air or network path that reaches hci_suspend_notifier, so the attack must be staged from local system access.\nAC:L - An attacker who can initiate suspend/resume and cause the Bluetooth adapter to unregister (e.g. adding/removing a USB Bluetooth dongle on a shared workstation or kiosk) drives both sides of the race and can retry the suspend/unplug cycle indefinitely until the window is hit.\nPR:L - On typical desktop, laptop and kiosk deployments an unprivileged user in an active local session can request suspend through logind/polkit, and adapter unregistration can be induced without root, so basic local user privileges suffice rather than real root.\nUI:N - The attacker performs both the suspend request and the adapter removal themselves; no action by a separate victim user is needed to reach the racing code paths.\nS:U - The freed hci_dev object and the corrupted memory both live in the kernel\u0027s own security authority; exploitation yields kernel-level compromise without crossing a VM, IOMMU or sandbox boundary.\nC:H - Use-after-free of the kzalloc\u0027d hci_dev structure lets an attacker reclaim the slab object and have hci_suspend_sync()/hci_resume_sync() read attacker-influenced or stale kernel data, providing a path to arbitrary kernel memory disclosure.\nI:H - The stale hdev is written to (hdev-\u003esuspended, suspend_state, scanning_paused) and its function pointers (hdev-\u003esend, hdev-\u003ewakeup) and workqueue/mutex members are dereferenced after free, giving heap-spray-based arbitrary write and control-flow hijack potential.\nA:H - The reported failure mode is an outright kernel crash during suspend (hci_suspend_sync oops), and any UAF of this kind reliably panics or hangs the system, denying service across a suspend/resume cycle."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T09:14:36.124Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/e1fa25a91091bbed691ba2996a6cee809e3309a2"
        },
        {
          "url": "https://git.kernel.org/stable/c/06e2b5ad72b60f90bfe565c201346532e271f484"
        },
        {
          "url": "https://git.kernel.org/stable/c/f9c8ce5d665653e3cf71a76349d41d7a7f7947e6"
        },
        {
          "url": "https://git.kernel.org/stable/c/573ebae162111063eedc6c838a659ba628f66a0f"
        }
      ],
      "title": "Bluetooth: Fix hci_suspend_sync crash",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2023-53520",
    "datePublished": "2025-10-01T11:46:07.355Z",
    "dateReserved": "2025-10-01T11:39:39.407Z",
    "dateUpdated": "2026-08-05T09:14:36.124Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2023-53520",
      "date": "2026-09-15",
      "epss": "0.00115",
      "percentile": "0.01762"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2023-53520\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-10-01T12:15:56.323\",\"lastModified\":\"2026-08-04T10:19:10.503\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nBluetooth: Fix hci_suspend_sync crash\\n\\nIf hci_unregister_dev() frees the hci_dev object but hci_suspend_notifier\\nmay still be accessing it, it can cause the program to crash.\\nHere\u0027s the call trace:\\n  \u003c4\u003e[102152.653246] Call Trace:\\n  \u003c4\u003e[102152.653254]  hci_suspend_sync+0x109/0x301 [bluetooth]\\n  \u003c4\u003e[102152.653259]  hci_suspend_dev+0x78/0xcd [bluetooth]\\n  \u003c4\u003e[102152.653263]  hci_suspend_notifier+0x42/0x7a [bluetooth]\\n  \u003c4\u003e[102152.653268]  notifier_call_chain+0x43/0x6b\\n  \u003c4\u003e[102152.653271]  __blocking_notifier_call_chain+0x48/0x69\\n  \u003c4\u003e[102152.653273]  __pm_notifier_call_chain+0x22/0x39\\n  \u003c4\u003e[102152.653276]  pm_suspend+0x287/0x57c\\n  \u003c4\u003e[102152.653278]  state_store+0xae/0xe5\\n  \u003c4\u003e[102152.653281]  kernfs_fop_write+0x109/0x173\\n  \u003c4\u003e[102152.653284]  __vfs_write+0x16f/0x1a2\\n  \u003c4\u003e[102152.653287]  ? selinux_file_permission+0xca/0x16f\\n  \u003c4\u003e[102152.653289]  ? security_file_permission+0x36/0x109\\n  \u003c4\u003e[102152.653291]  vfs_write+0x114/0x21d\\n  \u003c4\u003e[102152.653293]  __x64_sys_write+0x7b/0xdb\\n  \u003c4\u003e[102152.653296]  do_syscall_64+0x59/0x194\\n  \u003c4\u003e[102152.653299]  entry_SYSCALL_64_after_hwframe+0x5c/0xc1\\n\\nThis patch holds the reference count of the hci_dev object while\\nprocessing it in hci_suspend_notifier to avoid potential crash\\ncaused by the race condition.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/bluetooth/hci_core.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"9952d90ea2885d7cbf80cd233f694f09a9c0eaec\",\"lessThan\":\"e1fa25a91091bbed691ba2996a6cee809e3309a2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9952d90ea2885d7cbf80cd233f694f09a9c0eaec\",\"lessThan\":\"06e2b5ad72b60f90bfe565c201346532e271f484\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9952d90ea2885d7cbf80cd233f694f09a9c0eaec\",\"lessThan\":\"f9c8ce5d665653e3cf71a76349d41d7a7f7947e6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9952d90ea2885d7cbf80cd233f694f09a9c0eaec\",\"lessThan\":\"573ebae162111063eedc6c838a659ba628f66a0f\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/bluetooth/hci_core.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.7\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.7\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.199\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.55\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.5.5\",\"lessThanOrEqual\":\"6.5.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9},{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":4.7,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.0,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-362\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.7\",\"versionEndExcluding\":\"6.1.55\",\"matchCriteriaId\":\"88F0DAEB-0946-4C4E-B552-34F18C55FDDF\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.5.5\",\"matchCriteriaId\":\"8CF71E85-DA24-4925-95C5-E5C15DA71AE6\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/06e2b5ad72b60f90bfe565c201346532e271f484\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/573ebae162111063eedc6c838a659ba628f66a0f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/e1fa25a91091bbed691ba2996a6cee809e3309a2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/f9c8ce5d665653e3cf71a76349d41d7a7f7947e6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-04T19:17:01+00:00",
      "cve": "CVE-2023-53520",
      "id": "CVE-2023-53520",
      "initial_release_date": "2023-01-01T00:00:00+00:00",
      "product_status:known_affected": "198",
      "product_status:known_not_affected": "76",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Bluetooth: Fix hci_suspend_sync crash",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-53520.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-09-13T23:46:16Z",
      "cve": "CVE-2023-53520",
      "id": "CVE-2023-53520",
      "initial_release_date": "2025-10-01T23:29:40Z",
      "product_status:known_affected": "394",
      "product_status:known_not_affected": "393",
      "product_status:recommended": "310",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2023-53520",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2023-53520.json",
      "version": "49"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


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