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CVE-2026-43119

Full vulnerability record from the local CVENow database.

Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_sync: annotate data-races around hdev->req_status __hci_cmd_sync_sk() sets hdev->req_status under hdev->req_lock: hdev->req_status = HCI_REQ_PEND; However, several other functions read or write hdev->req_status without holding any lock: - hci_send_cmd_sync() reads req_status in hci_cmd_work (workqueue) - hci_cmd_sync_complete() reads/writes from HCI event completion - hci_cmd_sync_cancel() / hci_cmd_sync_cancel_sync() read/write - hci_abort_conn() reads in connection abort path Since __hci_cmd_sync_sk() runs on hdev->req_workqueue while hci_send_cmd_sync() runs on hdev->workqueue, these are different workqueues that can execute concurrently on different CPUs. The plain C accesses constitute a data race. Add READ_ONCE()/WRITE_ONCE() annotations on all concurrent accesses to hdev->req_status to prevent potential compiler optimizations that could affect correctness (e.g., load fusing in the wait_event condition or store reordering).

Severity
MEDIUM
CVSS score
5.5 (v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-05-06 10:16:25.773000
Last modified
2026-10-30 13:18:46.183000
View original CVE JSON 
{
  "id": "CVE-2026-43119",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-05-06T10:16:25.773",
  "lastModified": "2026-10-30T13:18:46.183",
  "vulnStatus": "Modified",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_sync: annotate data-races around hdev->req_status\n\n__hci_cmd_sync_sk() sets hdev->req_status under hdev->req_lock:\n\n    hdev->req_status = HCI_REQ_PEND;\n\nHowever, several other functions read or write hdev->req_status without\nholding any lock:\n\n  - hci_send_cmd_sync() reads req_status in hci_cmd_work (workqueue)\n  - hci_cmd_sync_complete() reads/writes from HCI event completion\n  - hci_cmd_sync_cancel() / hci_cmd_sync_cancel_sync() read/write\n  - hci_abort_conn() reads in connection abort path\n\nSince __hci_cmd_sync_sk() runs on hdev->req_workqueue while\nhci_send_cmd_sync() runs on hdev->workqueue, these are different\nworkqueues that can execute concurrently on different CPUs. The plain\nC accesses constitute a data race.\n\nAdd READ_ONCE()/WRITE_ONCE() annotations on all concurrent accesses\nto hdev->req_status to prevent potential compiler optimizations that\ncould affect correctness (e.g., load fusing in the wait_event\ncondition or store reordering)."
    }
  ],
  "affected": [
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      "affectedData": [
        {
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          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "net/bluetooth/hci_conn.c",
            "net/bluetooth/hci_core.c",
            "net/bluetooth/hci_sync.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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              "versionType": "git",
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              "version": "a3d50fb7ce931f08a2c6194fdc4c9a56c9ed4153",
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            },
            {
              "version": "4.19.47",
              "lessThan": "4.20",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "5.0.20",
              "lessThan": "5.1",
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            },
            {
              "version": "5.1.6",
              "lessThan": "5.2",
              "versionType": "semver",
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            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "net/bluetooth/hci_conn.c",
            "net/bluetooth/hci_core.c",
            "net/bluetooth/hci_sync.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
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              "version": "5.2",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "5.2",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.1.191",
              "lessThanOrEqual": "6.1.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.6.145",
              "lessThanOrEqual": "6.6.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.12.83",
              "lessThanOrEqual": "6.12.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.18.24",
              "lessThanOrEqual": "6.18.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.19.14",
              "lessThanOrEqual": "6.19.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.0",
              "lessThanOrEqual": "*",
              "versionType": "original_commit_for_fix",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Primary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Primary",
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
        }
      ]
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
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              "vulnerable": true,
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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  "references": [
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      "url": "https://git.kernel.org/stable/c/40734ce8efc34c4a0d0222855798c0dc14b65f2e",
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}