CVE-2026-90255

8.8 HIGH

Published 2026-09-17 · Updated 2026-09-18

AI risk analysis

Summary: This vulnerability in the Linux kernel's Bluetooth stack allows an attacker to leak memory contexts and potentially free connections while work is queued, leading to potential denial of service or other issues.
Exploitability: Exploitation requires the attacker to cancel a Bluetooth connection setup, which is a precondition. The difficulty is moderate as it depends on specific timing and control over the connection setup process.
Blast radius: If exploited, the impact is likely limited to the affected Bluetooth connection and could result in denial of service for that connection.
Detection: No reliable host or network indicator is derivable from the published description.
Prioritized remediation: Upgrade to the fixed version 6.2-rc1 or later.

bluetoothmemory-leakdos

Analysis generated locally by qwen2.5:7b-instruct (no data left the box). AI-assisted — verify against primary sources before acting.

NVD description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_conn: fix the SCO setup context lifetime hci_setup_sync() queues a conn_handle_t with a NULL destroy callback, so the context is only freed if hci_enhanced_setup_sync() actually runs. An entry that is cancelled instead is leaked, as _hci_cmd_sync_cancel_entry() does not release entry->data when there is no destroy callback, and hci_cmd_sync_clear() cancels every pending entry when the controller is unregistered. The context also stores a bare hci_conn pointer, so the connection can be freed while the work is queued. The dequeue in hci_conn_del() does not cover it either, as it matches on entry->data == conn and entry->data is the wrapper here. Same problem as commit 2f5d635ad590 ("Bluetooth: hci_sync: hold conn in hci_connect_acl/le_sync() callbacks"). Hold the connection and release both from a destroy callback. The submission failure path drops both, since hci_cmd_sync_submit() does not call the destroy callback when it fails to queue.

CVSS vector

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

All references

Source data: NVD (nvd.nist.gov), public domain. Exploit-DB.ai adds local AI analysis for defensive use only.

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