CVE-2026-53276 – Bluetooth: ISO: Fix a use-after-free of the hci_conn pointer

CVE ID :CVE-2026-53276

Published : June 25, 2026, 8:39 a.m. | 1 hour, 4 minutes ago

Description :In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: ISO: Fix a use-after-free of the hci_conn pointer

In iso_sock_rebind_bc(), the bis pointer is cached, then the socket lock is
dropped:
bis = iso_pi(sk)->conn->hcon;
/* Release the socket before lookups since that requires hci_dev_lock
* which shall not be acquired while holding sock_lock for proper
* ordering.
*/
release_sock(sk);
hci_dev_lock(bis->hdev);

During the unlocked window, could a concurrent close() destroy the connection
and free the bis structure, causing hci_dev_lock(bis->hdev) to access memory
after it is freed, fix this by using the hdev reference which was safely
acquired via iso_conn_get_hdev().

Severity: 0.0 | NA

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