CVE-2026-46111Bluetooth: hci_conn: fix potential UAF in create_big_sync
Updated under an hour ago ()
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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().
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Undergoing Analysis
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from eca0ae4aea66914515e5e3098ea051b518ee5316 before d41093723e47255d7d74df86e2736711c1b8486e; from eca0ae4aea66914515e5e3098ea051b518ee5316 before 6823f730bf195fc296d9edd09e2ca94bc1ff5584; from eca0ae4aea66914515e5e3098ea051b518ee5316 before 1750a2df0eab61dc421a7afae74abdd239a44b85; from eca0ae4aea66914515e5e3098ea051b518ee5316 before dc34f8d8240f25dd137dc2758ebbcc75e3779142; from eca0ae4aea66914515e5e3098ea051b518ee5316 before f8eaf92c57ad99358dd372580d5ff87623343a72; from eca0ae4aea66914515e5e3098ea051b518ee5316 before 0beddb0c380bed5f5b8e61ddbe14635bb73d0b41 | CNA record |
linux linux_kernel linux:linux_kernel | from 6.0 before 6.6.140; from 6.7 before 6.12.90; from 6.13 before 6.18.32; from 6.19 before 7.0.7; 7.1; 7.1 | NVD |
References
- https://git.kernel.org/stable/c/d41093723e47255d7d74df86e2736711c1b8486e
- https://git.kernel.org/stable/c/6823f730bf195fc296d9edd09e2ca94bc1ff5584patch
- https://git.kernel.org/stable/c/1750a2df0eab61dc421a7afae74abdd239a44b85patch
- https://git.kernel.org/stable/c/dc34f8d8240f25dd137dc2758ebbcc75e3779142patch
- https://git.kernel.org/stable/c/f8eaf92c57ad99358dd372580d5ff87623343a72patch
- https://git.kernel.org/stable/c/0beddb0c380bed5f5b8e61ddbe14635bb73d0b41patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.