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.
affected:
{
defaultStatus: unaffected
packageName: Zephyr
product: Zephyr
repo: https://github.com/zephyrproject-rtos/zephyr
vendor: zephyrproject-rtos
versions:
lessThanOrEqual: 3.3, status: affected, version: *, versionType: git
}
metrics:
cvssV3_1: [
attackComplexity: HIGH
attackVector: ADJACENT_NETWORK
availabilityImpact: HIGH
baseScore: 5.9
baseSeverity: MEDIUM
confidentialityImpact: LOW
integrityImpact: LOW
privilegesRequired: LOW
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:H
version: 3.1
]
format: CVSS
scenarios: GENERAL