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CVE-2026-53357 is a race-condition-driven use-after-free vulnerability in the Linux kernel Bluetooth subsystem, specifically in L2CAP socket handling involving l2cap_sock_cleanup_listen() and l2cap_conn_del(). The flaw arises because bt_accept_dequeue() can unlink a not-yet-accepted child socket from a listening socket's accept queue and release its socket lock before returning it without leaving the caller with a stable reference. During concurrent teardown, a Bluetooth HCI disconnect can trigger l2cap_conn_del(), which proceeds through channel deletion and socket destruction paths and frees the child socket and its associated L2CAP channel. If l2cap_sock_cleanup_listen() subsequently walks the listening socket's children, it can dereference and operate on already freed objects, resulting in a slab use-after-free in the kernel. The issue persists despite earlier fixes that serialized accept queue access and close/accept races, because this path is driven asynchronously from HCI receive work rather than only from userspace socket operations.
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Cross-references every affected SKU, including bundled OEM variants.
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