CVE-2026-64206
HighCVSS 8.8Exploitation Probability (EPSS)
Low risk18th percentile - higher than 18% of all known CVEs
Summary
In the Linux kernel's Bluetooth L2CAP subsystem, a deadlock occurs during connection teardown. l2cap_conn_del() locks conn->lock and then waits for pending_rx_work, which also tries to lock the same mutex, causing a circular lock dependency.
Risk Assessment
The deadlock can cause system hangs or kernel crashes, leading to denial of service (DoS) for Bluetooth-using processes.
Recommendation
Apply the Linux kernel patch that reorders operations: cancel pending_rx_work before taking conn->lock.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: cancel pending_rx_work before taking conn->lock l2cap_conn_del() takes conn->lock and then calls cancel_work_sync() for pending_rx_work. process_pending_rx() takes the same mutex, so teardown can deadlock against the worker it is flushing. This issue was found by our static analysis tool and then manually reviewed against the current tree. The grounded PoC kept the l2cap_conn_ready() -> queue_work(..., &conn->pending_rx_work) submit path, the l2cap_conn_del() -> cancel_work_sync(&conn->pending_rx_work) teardown path, and the process_pending_rx() -> mutex_lock(&conn->lock) worker edge. Lockdep WARNING: possible circular locking dependency detected process_pending_rx+0x21/0x2a [vuln_msv] l2cap_conn_del.constprop.0+0x3f/0x4e [vuln_msv] *** DEADLOCK *** Cancel pending_rx_work before taking conn->lock, matching the existing lock-before-drain ordering used for the two delayed works in the same teardown path. The pending_rx queue is still purged after the work has been cancelled and conn->lock has been acquired.