Description (CNA)
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().
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected eca0ae4aea66914515e5e3098ea051b518ee5316 before d41093723e47255d7d74df86e2736711c1b8486e; affected eca0ae4aea66914515e5e3098ea051b518ee5316 before 6823f730bf195fc296d9edd09e2ca94bc1ff5584; affected eca0ae4aea66914515e5e3098ea051b518ee5316 before 1750a2df0eab61dc421a7afae74abdd239a44b85; affected eca0ae4aea66914515e5e3098ea051b518ee5316 before dc34f8d8240f25dd137dc2758ebbcc75e3779142; affected eca0ae4aea66914515e5e3098ea051b518ee5316 before f8eaf92c57ad99358dd372580d5ff87623343a72; affected eca0ae4aea66914515e5e3098ea051b518ee5316 before 0beddb0c380bed5f5b8e61ddbe14635bb73d0b41 |
| Linux / Linux | affected 6.0; unaffected 0 before 6.0; unaffected 6.1.183 through 6.1.*; unaffected 6.6.140 through 6.6.*; unaffected 6.12.90 through 6.12.*; unaffected 6.18.32 through 6.18.*; unaffected 7.0.7 through 7.0.*; unaffected 7.1 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/d41093723e47255d7d74df86e2736711c1b8486e
- https://git.kernel.org/stable/c/6823f730bf195fc296d9edd09e2ca94bc1ff5584
- https://git.kernel.org/stable/c/1750a2df0eab61dc421a7afae74abdd239a44b85
- https://git.kernel.org/stable/c/dc34f8d8240f25dd137dc2758ebbcc75e3779142
- https://git.kernel.org/stable/c/f8eaf92c57ad99358dd372580d5ff87623343a72
- https://git.kernel.org/stable/c/0beddb0c380bed5f5b8e61ddbe14635bb73d0b41
ADP enrichment
No English description supplied.
No references supplied.