{"id":"CVE-2026-90255","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-90255","summary":"Bluetooth: hci_conn: fix the SCO setup context lifetime","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_conn: fix the SCO setup context lifetime\n\nhci_setup_sync() queues a conn_handle_t with a NULL destroy callback, so\nthe context is only freed if hci_enhanced_setup_sync() actually runs. An\nentry that is cancelled instead is leaked, as\n_hci_cmd_sync_cancel_entry() does not release entry->data when there is\nno destroy callback, and hci_cmd_sync_clear() cancels every pending entry\nwhen the controller is unregistered.\n\nThe context also stores a bare hci_conn pointer, so the connection can be\nfreed while the work is queued. The dequeue in hci_conn_del() does not\ncover it either, as it matches on entry->data == conn and entry->data is\nthe wrapper here. Same problem as commit 2f5d635ad590 (\"Bluetooth:\nhci_sync: hold conn in hci_connect_acl/le_sync() callbacks\").\n\nHold the connection and release both from a destroy callback. The\nsubmission failure path drops both, since hci_cmd_sync_submit() does not\ncall the destroy callback when it fails to queue.","published":"2026-09-17T16:07:54.775Z","modified":"2026-09-19T03:47:25.636530079Z","cvss":{"score":8.8,"severity":"HIGH","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"Linux","name":"Kernel","fixedVersion":"6.1.188"}],"fix":null,"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/37cfec41365c826d5496ef5d00c9e215eee53aa2"},{"type":"WEB","url":"https://git.kernel.org/stable/c/42de40abe25db9211107af8896d0fd741f10648d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4d7b1c834d2775b73c65e4888e01f5af8b477fe9"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9a2ba69cebe3fc5a3d4fa8eaaad3c42862723c27"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a661de0ee29d0915c5e924edf91d2be2b4d35bae"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c1fe3c74a89a7749cba3caa0dd91236049c66116"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90255.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-90255"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-19T03:47:25.636530079Z"}}