CVE-2026-68393

HighCVSS 8.8

Published: 10/08/2026(UTC)Updated: 17/08/2026(UTC)Translated: 10/08/2026(UTC)NVD NIST

Exploitation Probability (EPSS)

Low risk

0.24%

16th percentile - higher than 16% of all known CVEs

Summary

In the Linux kernel's Bluetooth subsystem (hci_sync), a vulnerability was found where RCU-protected pointers are used outside critical sections without proper refcounting, potentially leading to use-after-free. The fix extends critical sections and adds rcu_read_lock() where needed.

Risk Assessment

This could lead to system crashes or potentially arbitrary code execution in kernel context.

Recommendation

Apply a Linux kernel update containing the fix that extends critical sections and adds appropriate RCU locks.

Original NVD description (English source)

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_sync: extend conn_hash lookup critical sections Using RCU-protected pointers outside the critical sections without refcount is incorrect and may result to UAF. Extend critical section to cover both hci_conn_hash lookup and use of the returned conn. Add surrounding rcu_read_lock() also when return value is not used, in preparation for RCU lockdep requirement to hci_lookup_le_connect(). This avoids concurrent deletion of the conn before we are done dereferencing it. Also, make sure to hold hdev->lock when accessing hdev->accept_list.