{"apiVersion":"1.0","identifier":"CVE-2026-99216","description":"In the Linux kernel, the following vulnerability has been resolved: Drivers: hv: Don-t reset VMBus connection state on error/exit paths In two places, current code forces vmbus_connection.conn_state to DISCONNECTED prior to calling vmbus_disconnect(). But vmbus_disconnect() calls vmbus_initiate_unload(), which unloads the VMBus connection only if the conn_state is CONNECTED. Consequently, the connection remains and the Hyper-V host might continue to send messages or post VMBus interrupts. The problem was introduced in commit 74347a99e73ae (-x86/Hyper-V: Unload vmbus channel in hv panic callback-), in that vmbus_initiate_unload() started checking the current connection state before doing the unload. This commit removed some occurrences where conn_state was forced to DISCONNECTED, but these two remained, apparently due to an oversight at the time. Fix this by not forcing conn_state to DISCONNECTED during VMBus exit, or if a failure occurs when establishing the connection in the first place. Whatever value conn_state has at the time is then read by vmbus_initiate_unload() to determine if there is a connection to be unloaded.","publishedAt":"2026-10-28T11:17:43","lastModifiedAt":"2026-10-31T13:17:59","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-99216","cvssScore":8.4,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","epssProbability":0.00137,"riskScore":0.85,"affectedProduct":"Linux kernel","affectedVersions":"unknown","vulnerabilityType":"Kernel","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-99216","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-99216","en":"https://www.redsauce.net/en/cves/CVE-2026-99216","fr":"https://www.redsauce.net/fr/cves/CVE-2026-99216","pt":"https://www.redsauce.net/pt/cves/CVE-2026-99216","de":"https://www.redsauce.net/de/cves/CVE-2026-99216","sk":"https://www.redsauce.net/sk/cves/CVE-2026-99216","el":"https://www.redsauce.net/el/cves/CVE-2026-99216"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-99216"}}