CVE-2026-46111 (GCVE-0-2026-46111)
Vulnerability from cvelistv5
Published
2026-05-28 09:35
Modified
2026-10-19 19:26
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_conn: fix potential UAF in create_big_sync Add hci_conn_valid() check in create_big_sync() to detect stale connections before proceeding with BIG creation. Handle the resulting -ECANCELED in create_big_complete() and re-validate the connection under hci_dev_lock() before dereferencing, matching the pattern used by create_le_conn_complete() and create_pa_complete(). Keep the hci_conn object alive across the async boundary by taking a reference via hci_conn_get() when queueing create_big_sync(), and dropping it in the completion callback. The refcount and the lock are complementary: the refcount keeps the object allocated, while hci_dev_lock() serializes hci_conn_hash_del()'s list_del_rcu() on hdev->conn_hash, as required by hci_conn_del(). hci_conn_put() is called outside hci_dev_unlock() so the final put (which resolves to kfree() via bt_link_release) does not run under hdev->lock, though the release path would be safe either way. Without this, create_big_complete() would unconditionally dereference the conn pointer on error, causing a use-after-free via hci_connect_cfm() and hci_conn_del().
References
Impacted products
Vendor Product Version
Linux Linux Version: eca0ae4aea66914515e5e3098ea051b518ee5316
Version: eca0ae4aea66914515e5e3098ea051b518ee5316
Version: eca0ae4aea66914515e5e3098ea051b518ee5316
Version: eca0ae4aea66914515e5e3098ea051b518ee5316
Version: eca0ae4aea66914515e5e3098ea051b518ee5316
Version: eca0ae4aea66914515e5e3098ea051b518ee5316
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