{"id":"CVE-2026-98175","summary":"smb: client: cancel reconnect work in clean_demultiplex_info()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: cancel reconnect work in clean_demultiplex_info()\n\nclean_demultiplex_info() cancels server-\u003eecho delayed work but not\nserver-\u003ereconnect, which can cause a use-after-free when the\ndemultiplex thread exits while a reconnect work is still queued:\n\n  cifs_demultiplex_thread()\n    cifs_readv_from_socket()\n      cifs_reconnect()\n        __cifs_reconnect()\n          cifs_queue_server_reconn()\n            mod_delayed_work(cifsiod_wq, &server-\u003ereconnect, 0)\n    clean_demultiplex_info()\n      cancel_delayed_work_sync(&server-\u003eecho)   // echo canceled\n                                                 // reconnect NOT canceled\n      kfree_sensitive(server)                    // server freed\n\n  ...later, on cifsiod_wq:\n\n  smb2_reconnect_server()\n    server-\u003esrv_count  // UAF read of freed server\n\nFix this by canceling server-\u003ereconnect delayed work in\nclean_demultiplex_info() before the server is freed, the same way\ncifs_put_tcp_session() already does.","modified":"2026-10-08T02:52:52.504256138Z","published":"2026-10-06T08:44:19.155Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98175.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/180380272f116dbd2b0354c5c7872e112e519149"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2e5103e11a17c274715dd56cf185eeedccf686b8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7ab9ceedd860216fb97f2d8574cbe58b8906f42a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c65eae6f61d1778ff7a82e4aae4080e26f486af1"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e3f6a779433d13aafb5edab59e4f9313051e8a52"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98175.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98175"},{"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":"53e0e11efe9289535b060a51d4cf37c25e0d0f2b"},{"fixed":"180380272f116dbd2b0354c5c7872e112e519149"},{"fixed":"e3f6a779433d13aafb5edab59e4f9313051e8a52"},{"fixed":"7ab9ceedd860216fb97f2d8574cbe58b8906f42a"},{"fixed":"2e5103e11a17c274715dd56cf185eeedccf686b8"},{"fixed":"c65eae6f61d1778ff7a82e4aae4080e26f486af1"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"3.10.107"},{"fixed":"3.11"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"3.12.70"},{"fixed":"3.13"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"3.16.42"},{"fixed":"3.17"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"3.18.47"},{"fixed":"3.19"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4.1.38"},{"fixed":"4.2"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4.4.40"},{"fixed":"4.5"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4.8.16"},{"fixed":"4.9"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4.9.1"},{"fixed":"4.10"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"e008a962311a875a828cbae54b43285858aaa6c8"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"123b228a09b90b50b0a9d6eb8294cf0c42efc029"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0ba4c6eaaacbcc4b18f51bb3b1567c65a8fecca9"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"d0d2a4c82942e2f51e4984beea1f7e5a994bd06c"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"15a12fbbf365a483b1c19f9caeb707b3bea77e10"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"f0b715409cb9cf7e21e690f9b163047739761962"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"ff04da387c10b6bf7b510392742c8cd46c130fd6"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"48f9526f4dcb4b132fe0dc2450835311e3b013a6"}]}],"versions":["v3.10.108","v3.10.107","v3.12.74","v3.12.73","v3.12.72","v3.12.71","v3.12.70","v3.16.85","v3.16.84","v3.16.83","v3.16.82","v3.16.81","v3.16.80","v3.16.79","v3.16.78","v3.16.77","v3.16.76","v3.16.75","v3.16.74","v3.16.73","v3.16.72","v3.16.71","v3.16.70","v3.16.69","v3.16.68","v3.16.67","v3.16.66","v3.16.65","v3.16.64","v3.16.63","v3.16.62","v3.16.61","v3.16.60","v3.16.59","v3.16.58","v3.16.57","v3.16.56","v3.16.55","v3.16.54","v3.16.53","v3.16.52","v3.16.51","v3.16.50","v3.16.49","v3.16.48","v3.16.47","v3.16.46","v3.16.45","v3.16.44","v3.16.43","v3.16.42","v3.18.140","v3.18.139","v3.18.138","v3.18.137","v3.18.136","v3.18.135","v3.18.134","v3.18.133","v3.18.132","v3.18.131","v3.18.130","v3.18.129","v3.18.128","v3.18.127","v3.18.126","v3.18.125","v3.18.124","v3.18.123","v3.18.122","v3.18.121","v3.18.120","v3.18.119","v3.18.118","v3.18.117","v3.18.116","v3.18.115","v3.18.114","v3.18.113","v3.18.112","v3.18.111","v3.18.110","v3.18.109","v3.18.108","v3.18.107","v3.18.106","v3.18.105","v3.18.104","v3.18.103","v3.18.102","v3.18.101","v3.18.100","v3.18.99","v3.18.98","v3.18.97","v3.18.96","v3.18.95","v3.18.94","v3.18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