{"id":"CVE-2026-99216","summary":"Drivers: hv: Don't reset VMBus connection state on error/exit paths","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nDrivers: hv: Don't reset VMBus connection state on error/exit paths\n\nIn two places, current code forces vmbus_connection.conn_state to\nDISCONNECTED prior to calling vmbus_disconnect(). But vmbus_disconnect()\ncalls vmbus_initiate_unload(), which unloads the VMBus connection\nonly if the conn_state is CONNECTED. Consequently, the connection\nremains and the Hyper-V host might continue to send messages or post\nVMBus interrupts.\n\nThe problem was introduced in commit 74347a99e73ae (\"x86/Hyper-V:\nUnload vmbus channel in hv panic callback\"), in that\nvmbus_initiate_unload() started checking the current connection\nstate before doing the unload. This commit removed some occurrences\nwhere conn_state was forced to DISCONNECTED, but these two remained,\napparently due to an oversight at the time.\n\nFix this by not forcing conn_state to DISCONNECTED during VMBus exit,\nor if a failure occurs when establishing the connection in the first\nplace. Whatever value conn_state has at the time is then read by\nvmbus_initiate_unload() to determine if there is a connection to\nbe unloaded.","modified":"2026-11-13T04:07:33.861369701Z","published":"2026-10-28T10:36:09.383Z","related":["SUSE-SU-2026:24643-1","SUSE-SU-2026:24648-1","SUSE-SU-2026:24651-1","SUSE-SU-2026:24662-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/99xxx/CVE-2026-99216.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/2732210132f92aca0622b5134027990a809279d5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2939215d57bc8e4189290544fca78f3809ac3ef8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2e5ffbf1e41abbf6e02ce28115107938f55ff646"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3195546a377c2d8d176d837e8baad5ce15d11195"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a0ae955ba9a5067a157ebb8defb4a0a9cb1fc304"},{"type":"WEB","url":"https://git.kernel.org/stable/c/deef3ab5129ae4c45662c957cdab3739eb047fb1"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ec31dc39e835ccde0930daccece8c492d28282fc"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f47ce27af80b87cc684d5c12b65506af498ac7e5"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/99xxx/CVE-2026-99216.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-99216"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"74347a99e73ae00b8385f1209aaea193c670f901"},{"fixed":"2939215d57bc8e4189290544fca78f3809ac3ef8"},{"fixed":"a0ae955ba9a5067a157ebb8defb4a0a9cb1fc304"},{"fixed":"deef3ab5129ae4c45662c957cdab3739eb047fb1"},{"fixed":"2e5ffbf1e41abbf6e02ce28115107938f55ff646"},{"fixed":"2732210132f92aca0622b5134027990a809279d5"},{"fixed":"f47ce27af80b87cc684d5c12b65506af498ac7e5"},{"fixed":"3195546a377c2d8d176d837e8baad5ce15d11195"},{"fixed":"ec31dc39e835ccde0930daccece8c492d28282fc"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5e059fc0f054309036d3f612bc8b0a502ca58545"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"9f38f7b46de0747c1909e8c557aa21715dce20c5"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"caeeb3787167c884b955404a7e669fd77f267e44"}]}],"versions":["v4.19.325","v4.19.324","v4.19.323","v4.19.322","v4.19.321","v4.19.320","v4.19.319","v4.19.318","v4.19.317","v4.19.316","v4.19.315","v4.19.314","v4.19.313","v4.19.312","v4.19.311","v4.19.310","v4.19.309","v4.19.308","v4.19.307","v4.19.306","v4.19.305","v4.19.304","v4.19.303","v4.19.302","v4.19.301","v4.19.300","v4.19.299","v4.19.298","v4.19.297","v4.19.296","v4.19.295","v4.19.294","v4.19.293","v4.19.292","v4.19.291","v4.19.290","v4.19.289","v4.19.288","v4.19.287","v4.19.286","v4.19.285","v4.19.284","v4.19.283","v4.19.282","v4.19.281","v4.19.280","v4.19.279","v4.19.278","v4.19.277","v4.19.276","v4.19.275","v4.19.274","v4.19.273","v4.19.272","v4.19.271","v4.19.270","v4.19.269","v4.19.268","v4.19.267","v4.19.266","v4.19.265","v4.19.264","v4.19.263","v4.19.262","v4.19.261","v4.19.260","v4.19.259","v4.19.258","v4.19.257","v4.19.256","v4.19.255","v4.19.254","v4.19.253","v4.19.252","v4.19.251","v4.19.250","v4.19.249","v4.19.248","v4.19.247","v4.19.246","v4.19.245","v4.19.244","v4.19.243","v4.19.242","v4.19.241","v4.19.240","v4.19.239","v4.19.238","v4.19.237","v4.19.236","v4.19.235","v4.19.234","v4.19.233","v4.19.232","v4.19.231","v4.19.230","v4.19.229","v4.19.228","v4.19.227","v4.19.226","v4.19.225","v4.19.224","v4.19.223","v4.19.222","v4.19.221","v4.19.220","v4.19.219","v4.19.218","v4.19.217","v4.19.216","v4.19.215","v4.19.214","v4.19.213","v4.19.212","v4.19.211","v4.19.210","v4.19.209","v4.19.208","v4.19.207","v4.19.206","v4.19.205","v4.19.204","v4.19.203","v4.19.202","v4.19.201","v4.19.200","v4.19.199","v4.19.198","v4.19.197","v4.19.196","v4.19.195","v4.19.194","v4.19.193","v4.19.192","v4.19.191","v4.19.190","v4.19.189","v4.19.188","v4.19.187","v4.19.186","v4.19.185","v4.19.184","v4.19.183","v4.19.182","v4.19.181","v4.19.180","v4.19.179","v4.19.178","v4.19.177","v4.19.176","v4.19.175","v4.19.174","v4.19.173","v4.19.172","v4.19.171","v4.19.170","v4.19.169","v4.19.168","v4.19.167","v4.19.166","v4.19.165","v4.19.164","v4.19.163","v4.19.162","v4.19.161","v4.19.160","v4.19.159","v4.19.158","v4.19.157","v4.19.156","v4.19.155","v4.19.154","v4.19.153","v4.19.152","v4.19.151","v4.19.150","v4.19.149","v4.19.148","v4.19.147","v4.19.146","v4.19.145","v4.19.144","v4.19.143","v4.19.142","v4.19.141","v4.19.140","v4.19.139","v4.19.138","v4.19.137","v4.19.136","v4.19.135","v4.19.134","v4.19.133","v4.19.132","v4.19.131","v4.19.130","v4.19.129","v4.19.128","v4.19.127","v4.19.126","v4.19.125","v4.19.124","v4.19.123","v4.19.122","v4.19.121","v4.19.120","v4.19.119","v4.19.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