CVE-2026-64404
Low risk· EPSS 7%Exploitation Probability (EPSS)
Low risk7th percentile - higher than 7% of all known CVEs
Summary
In the Linux kernel Bluetooth ISO driver, iso_conn_big_sync() can cause a NULL pointer dereference because after releasing the socket lock, the connection may be torn down, and the function reads conn->hcon without re-checking conn validity.
Risk Assessment
An attacker could remotely trigger a kernel panic by sending Bluetooth packets to a PA-sync broadcast sink socket, exploiting a race window during synchronization.
Recommendation
Apply the Linux kernel patch that adds re-validation of the conn pointer in iso_conn_big_sync() and update your system to a version containing this fix.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: ISO: avoid NULL deref of conn in iso_conn_big_sync() iso_conn_big_sync() drops the socket lock to call hci_get_route() and then re-acquires it, but dereferences iso_pi(sk)->conn->hcon afterwards without re-checking that conn is still valid. While the lock is dropped, the connection can be torn down under the same socket lock: iso_disconn_cfm() -> iso_conn_del() -> iso_chan_del() sets iso_pi(sk)->conn to NULL (and the broadcast teardown path can also clear conn->hcon on its own). When iso_conn_big_sync() re-acquires the lock and reads conn->hcon, conn may be NULL, causing a NULL pointer dereference (hcon is the first member of struct iso_conn). This path is reached from iso_sock_recvmsg() for a PA-sync broadcast sink socket (BT_SK_DEFER_SETUP | BT_SK_PA_SYNC), so the dropped-lock window can race with connection teardown driven by controller events. Re-validate iso_pi(sk)->conn and its hcon after re-acquiring the socket lock and bail out if the connection went away, as already done in the sibling iso_sock_rebind_bc().