CVE-2026-31499
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Fix deadlock in l2cap_conn_del() l2cap_conn_del() calls cancel_delayed_work_sync() for both info_timer and id_addr_timer while holding conn->lock. However, the work functions l2cap_info_timeout() and l2cap_conn_update_id_addr() both acquire conn->lock, creating a potential AB-BA deadlock if the work is already executing when l2cap_conn_del() takes the lock. Move the work cancellations before acquiring conn->lock and use disable_delayed_work_sync() to additionally prevent the works from being rearmed after cancellation, consistent with the pattern used in hci_conn_del().
Severity
MEDIUM
CVSS score
5.5
(v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-04-22 14:16:48.283000
Last modified
2026-11-05 22:18:35.743000
View original CVE JSON
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"published": "2026-04-22T14:16:48.283",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: Fix deadlock in l2cap_conn_del()\n\nl2cap_conn_del() calls cancel_delayed_work_sync() for both info_timer\nand id_addr_timer while holding conn->lock. However, the work functions\nl2cap_info_timeout() and l2cap_conn_update_id_addr() both acquire\nconn->lock, creating a potential AB-BA deadlock if the work is already\nexecuting when l2cap_conn_del() takes the lock.\n\nMove the work cancellations before acquiring conn->lock and use\ndisable_delayed_work_sync() to additionally prevent the works from\nbeing rearmed after cancellation, consistent with the pattern used in\nhci_conn_del()."
}
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