23 Oct 2026 15:48:27 UTC
Bluetooth: SCO: hold sk properly in sco_conn_ready
cve-program · CVE-2026-89774 · Published
CVE-2026-89774
Bluetooth: SCO: hold sk properly in sco_conn_ready
CVSS 3.1 8.8 HIGHCheck source for fixed versionsKEV status unknown
cve-program · CVE-2026-89774
PublishedIn the Linux kernel, the following vulnerability has been resolved: Bluetooth: SCO: hold sk properly in sco_conn_ready sk deref in sco_conn_ready must be done either under conn->lock, or holding a refcount, to avoid concurrent close. conn->sk and parent sk is currently accessed without either, and without checking parent->sk_state: [Task 1] [Task 2] sco_sock_release sco_conn_ready sk = conn->sk lock_sock(sk) conn->sk = NULL lock_sock(sk) release_sock(sk) sco_sock_kill(sk) UAF on sk deref and similarly for access to sco_get_sock_listen() return value. Fix possible UAF by holding sk refcount in sco_conn_ready() and making sco_get_sock_listen() increase refcount. Also recheck after lock_sock that the socket is still valid. Adjust conn->sk locking so it's protected also by lock_sock() of the associated socket if any.
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