{"id":"CVE-2023-1901","aliases":["EUVD-2023-24090","GHSA-xvvm-8mcm-9cq3"],"status":"published","title":"HCI send_sync Dangling Semaphore Reference Re-use","description":"The bluetooth HCI host layer logic not clearing a global reference to a semaphore after synchronously sending HCI commands may allow a malicious HCI Controller to cause the use of a dangling reference in the host layer, leading to a crash (DoS) or potential RCE on the Host layer.","severity":{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:H","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00598,"percentile":0.48895,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-672","CWE-787"],"published":"2023-07-10T04:37:33Z","modified":"2026-10-28T02:31:03Z","products":[{"vendor":"zephyrproject","product":"zephyr"},{"vendor":"zephyrproject-rtos","product":"zephyr"}],"references":[{"url":"https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-xvvm-8mcm-9cq3","tags":["x_transferred","Vendor Advisory","advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/1xxx/CVE-2023-1901.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-1901","tags":["advisory"]},{"url":"https://github.com/zephyrproject-rtos/zephyr","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2023-1901","title":"HCI send_sync Dangling Semaphore Reference Re-use","description":"The bluetooth HCI host layer logic not clearing a global reference to a semaphore after synchronously sending HCI commands may allow a malicious HCI Controller to cause the use of a dangling reference in the host layer, leading to a crash (DoS) or potential RCE on the Host layer.\n\n\n","status":"published","published":"2023-07-10T04:37:33.126Z","modified":"2024-11-07T15:19:24.502Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:H","level":"medium","assessor":"cna"}],"cwes":["CWE-672"],"updated_at":"2026-11-02T14:35:32.019713Z"}],"euvd":[{"id":"EUVD-2023-24090","description":"The bluetooth HCI host layer logic not clearing a global reference to a semaphore after synchronously sending HCI commands may allow a malicious HCI Controller to cause the use of a dangling reference in the host layer, leading to a crash (DoS) or potential RCE on the Host layer.\n\n\n","status":"published","published":"2023-07-10T04:37:33Z","modified":"2024-11-07T15:19:24Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:H","level":"medium"}],"updated_at":"2026-11-03T00:05:08.272544Z"}],"nvd":[{"id":"CVE-2023-1901","description":"The bluetooth HCI host layer logic not clearing a global reference to a semaphore after synchronously sending HCI commands may allow a malicious HCI Controller to cause the use of a dangling reference in the host layer, leading to a crash (DoS) or potential RCE on the Host layer.\n\n\n","status":"published","published":"2023-07-10T16:15:49.003Z","modified":"2026-06-17T05:28:59.75Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:H","level":"medium","assessor":"secondary"},{"version":"3.1","score":8,"vector":"CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"primary"}],"cwes":["CWE-787","CWE-672"],"updated_at":"2026-11-02T14:08:15.127597Z"}],"osv":[{"id":"CVE-2023-1901","title":"HCI send_sync Dangling Semaphore Reference Re-use","description":"The bluetooth HCI host layer logic not clearing a global reference to a semaphore after synchronously sending HCI commands may allow a malicious HCI Controller to cause the use of a dangling reference in the host layer, leading to a crash (DoS) or potential RCE on the Host layer.\n\n\n","status":"published","published":"2023-07-10T04:37:33.126Z","modified":"2026-10-28T02:31:03.150502807Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:H","level":"medium"}],"updated_at":"2026-11-02T15:44:30.334753Z"}]}}