{"id":"CVE-2026-90255","title":"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_enhan…","summary":"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_enhan…","severity":"high","cvss":8.8,"cvssVector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","vendor":"Linux","product":"Linux","affected":["Linux >= e07a06b4eb417f5271d33ce2240e93c62d98b7b4 < 37cfec41365c826d5496ef5d00c9e215eee53aa2","Linux >= e07a06b4eb417f5271d33ce2240e93c62d98b7b4 < 9a2ba69cebe3fc5a3d4fa8eaaad3c42862723c27","Linux >= e07a06b4eb417f5271d33ce2240e93c62d98b7b4 < a661de0ee29d0915c5e924edf91d2be2b4d35bae","Linux >= e07a06b4eb417f5271d33ce2240e93c62d98b7b4 < c1fe3c74a89a7749cba3caa0dd91236049c66116","Linux >= e07a06b4eb417f5271d33ce2240e93c62d98b7b4 < 4d7b1c834d2775b73c65e4888e01f5af8b477fe9","Linux >= e07a06b4eb417f5271d33ce2240e93c62d98b7b4 < 42de40abe25db9211107af8896d0fd741f10648d","Linux 6.1"],"published":"2026-09-17","updated":"2026-09-18","sourceUpdated":"2026-09-18T18:17:51.010","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-90255","references":[{"url":"https://git.kernel.org/stable/c/37cfec41365c826d5496ef5d00c9e215eee53aa2","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/42de40abe25db9211107af8896d0fd741f10648d","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/4d7b1c834d2775b73c65e4888e01f5af8b477fe9","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/9a2ba69cebe3fc5a3d4fa8eaaad3c42862723c27","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/a661de0ee29d0915c5e924edf91d2be2b4d35bae","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/c1fe3c74a89a7749cba3caa0dd91236049c66116","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"epss":0.00341,"epssPercentile":0.27727,"ingestedAt":"2026-09-17T16:21:47.843Z","slug":"CVE-2026-90255","body":"## Overview\n\nIn 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":48.4,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":207217,"id":"CVE-2026-90255","ts":1789757339676,"field":"cvss","old":null,"new":"8.8"},{"seq":207216,"id":"CVE-2026-90255","ts":1789757339676,"field":"severity","old":"none","new":"high"}]}